Bridging The Gap: Fire Safety and Green Buildings Guide
A Fire and Safety Building Guide to Green Construction
The National Association of State Fire Marshals (NASFM) has released its fire and building safety guide to green construction called “Bridging the Gap: Fire Safety and Green Buildings.” This guide identifies some of the key areas where rapidly growing green building construction issues coincide with building and fire safety needs.
“This guide will give both the fire service and the green construction community a reference point for developing buildings and sites that are not only environmentally sound, but also continue to meet fire safety needs,” said NASFM President Alan Shuman. “This will provide a much-needed reference on issues that impact the life safety of building occupants, emergency responders and the larger community.”
Included are topical areas such as Site Selection and Use, Building Envelope and Design Attributes, and Building Systems and Alternative Power Sources. A key feature of the guide is a series of checklists focusing on plan reviews for commercial and residential occupancies. This document is meant as an introductory guide for fire chiefs and firefighters, building and fire code enforcement officials, architects and anyone involved in building design, plan reviews and construction.
Click here to download a copy of the guide, which was developed for NASFM by Jim Tidwell of Tidwell Code Consulting, with Jack Murphy, as part of a larger program under a Department of Homeland Security Fire Prevention and Safety Grant.
A video clip of a structure fire occurring in a single family residential occupancy shows, in the first few frames a back draft occurring per-arrival of fire services. It’s apparent there is a developing and progressing fire in the Charlie division which may have originated in the, or vicinity of the detached garage (B-C) which had a breezeway connected to the main house.
Alpha Street View
The large volume hip style (concealed space) roof may have become rapidly charged with elevated temperatures, superheated gases, products of combustion and possibly the initial stages direct flame extension through the eaves and into the truss loft. Incident scene operations photos depict an engineered structural roof system.
Aerial View- Divisions
Building Profile
Single family (SFD), Residential Occupancy
Built: 1981
2, 263 Sq. Ft.
4 Bedrooms
2 Bathrooms
7 Rooms
Detached Garage
Wood frame, slab on grade
Type/Class- V/5
Brick Veneer
Divisions:
A- Street
B- SFD Residential; similar
C- Yard, with Detached Garage (B-C) and large room extension
D- SFD Residential; similar
Aerial Alpha and Charlie with Roof
Roof Profile
Pre-arrival fire conditions exhibit indicators that suggest the need for the rapid intervention of arriving companies and a coordinated aggressive posture tactically if the incident action plan is formulated to achieve an interior attack. Given the scenario of the backdraft conditions, the likelihood for a degraded or compromised ceiling membrane enclosure (intact ceilings, thus limiting fire extension) being present will hamper and may be an operational concern for interior operating companies as fire conditions continue to grow in magnitude and severity and full extend and take command of the truss loft enclosure.
These fire conditions will extend into the space, resulting in degradation of the structural components and roof assembly-which will present a high risk potential for isolated or catastrophic collapse. This intrusion into the truss loft would require interior operating company officers to maintain attentiveness towards the effectiveness and progress of tactical suppression and support tasks with the potential for fire quickly dropping into operating areas and affecting firefighter safety.
Coordinated and timely vertical ventilation and roof work may be warranted if part of the normal operating parameters of the fire service agencies. In some areas of the county, vertical ventilation is not considered a tactical functional objective and is not implemented.
Adequate fire flow for suppression must be established early on in the operations, if an interior attack is implemented. Projected fire intensity and severity may challenge initial engine companies if hand lines and fire flow rates and the placement of hose streams are ineffective or marginal. In the event of master stream operations it would be crucial to ensure interior fire suppression operations are suspended, a transition to a defensive mode is communicated and acknowledge on the fireground with collapse zone considerations.
Operational Considerations
In viewing the video of pre-arrival conditions and fire parameters and indicators; as an arriving company officer or commanding officer, how would you establish your incident action plan (IAP) and establish operations? Present and discuss why you would make these decisions, what is/are the basis?
What would you be considering in the areas of:
Building Integrity
Collapse Potential
Interior Fire Attack Considerations
Resource Needs: Staffing and Apparatus
Critical Operational Tasks
Apparatus Placement
Hose Line Placement
Safety Considerations
Exposures
Contingency Issues: What can go wrong?
Assuming you are just arriving on scene and observe the backdraft conditions from the front seat; What would your operational IAP be and why?
Identify and discuss the types of mission critical size-up consideration that must be recognized and processed?
How does apparatus placement affect incident operations?
What first-due operational factors have you experienced that were contingent upon other tasks or considerations that were apparent to you or you implemented?
How does extreme fire behavior and fire dynamics affect your fire ground position?
How does this scenario and building size and type relate to similar structures and occupancies in your district or mutual aid/greater alarm response area?
The Second National Fire Service Research Agenda Symposium
A new report identifies seven critical areas where more research is needed to further reduce the number of firefighters killed or injured in the line of duty. These priorities were developed during the Second National Fire Service Research Agenda Symposium sponsored by the National Fallen Firefighters Foundation (NFFF).
More than 70 representatives from a broad range of fire service-related organizations met over two days at the National Fire Academy in Emmitsburg, Maryland. Their goal, to update the current Research Agenda, a guide for research projects within the fire service. In doing so the following seven areas were identified as research priorities: Community Risk Reduction; Wildland Firefighting; Data Collection; Technology and Fire Service Science; Firefighter Health and Wellness; Emergency Service Delivery; and Tools and Equipment.
More than 70 representatives from a broad range of fire service-related organizations participated
The 2nd National Fire Service Research Agenda
The Second National Fire Service Research Agenda Symposium was conducted on May 20 -22, 2011 and was also hosted by NFFF at the NFA campus in Emmitsburg, MD. The project was funded by the National Fallen Firefighters Foundation. The purpose of the second Symposium was to produce an updated edition of the Research Agenda, based on current relevancy, as a guide for future research efforts. Following the model that had been established six years earlier, more than 70 individuals, representing a diverse range of interests participated in the 2011 Symposium.
The participants (who represented 55 different organizations) were asked to self-determine where they would best be able to lend the greatest expertise and guidance, selecting among seven different discussion groups.
Each group was assigned a range of subject matter as their primary area to focus upon; however, it was recognized that the individual domains were broad and the boundaries could not be precisely defined. The groups were encouraged to approach their task with a broad perspective and to seek broad consensus as opposed to narrowly defined priorities. Each group produced a set of recommendations that were reported back to the full assembly for further discussion.
The research areas and the facilitators assigned to each research domain are listed below. The facilitators were chosen based upon their reputations as leaders in their respective areas. They provided leadership for discussion within their groups, and wrote the reports. Kevin Roche of the Phoenix Fire Department was the general facilitator.
Community Risk Reduction (Vickie Pritchett, Shane Ray)
Wildland Firefighting (Stan Gibson, Nelson Bryner)
Data Collection (Lori Moore-Merrell, DrPH)
Technology & Fire Service Science (Gavin Horn, PhD, Daniel Madrzykowski)
Firefighter Health and Wellness (Murrey Loflin, Sara Jahnke, PhD)
Emergency Service Delivery (Christopher Naum, Victor Stagnaro)
Tools and Equipment (Bruce Varner, Robert Tutterow)
Participants were divided into discussion groups based on their expertise within one of the seven areas to develop specific research recommendations for each of the topics. Out of this process came 41 recommendations for potential investigation projects.
“The first Research Agenda Symposium was an outcome of Firefighter Life Safety Initiative #7 which directly links a national research agenda and data collection system to firefighter safety,” said Ronald J. Siarnicki, executive director of the NFFF. “The second symposium was convened to assess the changes and advances that had occurred within the fire service over the previous six year and identify new needs and priorities for potential study.”
The updated Research Agenda is intended to provide a reference source and a starting point on where to direct efforts and funding.
The Symposium planning team asked each group to develop a maximum of ten recommendations for presentation to the plenary session on Sunday morning. The groups were also asked to keep their recommendations broad enough so they could be approached from a number of research perspectives and to include the rationale for recommending those particular subjects as research priorities. This proved to be an efficient process reflecting the high level of expertise represented in each group.
The Sunday session began with a discussion of grant programs and funding sources, led by AFG Branch Chief Cathie Patterson. The recommendations of the seven discussion groups were then presented by the respective facilitators for discussion by the full assembly. All of the 41 recommendations that were presented to the plenary session are included in the 2011 Research Agenda report.
The 2011 edition incorporates one significant departure from the 2005 Research Agenda report; the overall ranking of projects on a Priority 1-2-3 scale was omitted and only the priorities established within the individual discussion groups are included. This decision reflects a consensus of the assembled participants that it is extremely difficult and probably unrealistic to apply this type of prioritization process across such a wide range of subject areas.
There was also concern that a 1-2-3 prioritization might encourage researchers and funding organizations to limit their attention to only the highest priorities and thus to overlook the lower ranked topics. The participants wanted to emphasize that all of the identified projects merit attention and should be considered on their own merits. After considerable discussion the group voted to set aside the overall 1-2-3 ranking and asked each group identify one project that should be recognized as an immediate concern.
The number one recommendations are:
Community Risk Reduction: Creation of a community-scale model that evaluates fire prevention and response programs and quantifies their ability to produce a potentially positive outcome. This may include (but is not limited to) data pertaining to: occupancy types and numbers of each, fire prevention, codes adoption, mitigation, response, and recovery.
Wildland: Development of safe and reliable aircraft operations for suppression and team transportation to reduce Wildland firefighting injuries and fatalities.
Data Collection: Identification of cultural perception of data collection / Identification of barriers to capture of quality data.
Technology and Fire Service Science: Development of data, implementation of transfer mechanisms and updating of standards that will enable firefighters to learn the science and utilize the technology required to respond to the changing fire conditions in our modern built environment.
Health and Wellness: Effectiveness of intervention and screening for health and disease related to firefighter wellness and fitness.
Service Delivery: Development of a scientifically-based community risk assessment tool.
Tools and Equipment: Assessment of current PPE (entire ensemble) performance, functionality and related safety features for today’s fire environment.
Ultimately, the 41 recommendations contained in this report should serve as a roadmap for all researchers and applied scientists who are interested in firefighter safety and survivability. These recommendations must not be limited for use as AFG guidance only, but should serve as a guidance tool for all who seek grants within their various disciplines. It is also hoped that with these recommendations in hand, other potential research sponsors can be identified and successfully petitioned.
The Report of the Second National Fire Service Research Agenda Symposium is available through the EveryoneGoesHome.com website.
A comments section has been added to the site to collect recommendations for future research from members of the fire service.
An arson fire in a vacant home in North Las Vegas (NV) was intention set and devised in a manner to harm firefighters according to Authorities.
Upon arrival of fire companies, the second floor was fully involved with heavy smoke showing from outside the building.
North Las Vegas Firefighters and Las Vegas Fire and Rescue worked together to control the flames in the vacant two story home.
It took seven units and approximately 27 firefighters to contain the fire.
There was no extension of the fire to surrounding homes, it was contained in 15 minutes.
There aren’t specific details released on why authorities believe this fire was set to harm firefighters, but the fire official discussing the incident clearly expressed his concerns of what confronted operating companies at this alarm.
Residential Structure Built in 1997
The two story residential structure was of Type V, wood frame construction, built in 1997 consisting of 1,998 Square feet of space with three (3) beadrooms, seven total rooms and an attached garage.
It’s especially important for companies and company officers to remain highly vigilant upon entering and conducting interior operations for any signs or indications that conditions may not be as characteristic and expected for fires in similar occupancies or under prevailing conditions.
We plan to develop and prepare some safety awareness insights for operations in a few days. We’ll also continue to monitor information that may be forthcoming with further details as to what may have been encountered by firefighters.
Los Angeles Firefighters Battle Major Emergency at Townhouses Under Construction
Under-construction building fire forces dozens of evacuations
Six Townhouses Under Construction Photo, Onscene.TV
Townhouses Under Construction Aerial Screen capture from CBSLA.com
Operational Divisions with Exposures (Pre-Construction) Bing Maps
A townhouse complex under construction caught fire on November 10, 2011, in the Brentwood neighborhood of Los Angeles (CA). The six-unit, wood-framed complex was in its construction phase, where at least two of the units were fully involved in fire upon arrival of LAFD companies. Four of those six structures were severely damaged as a result of the construction stage and the degree of open wood frame construction resulting in rapid flame spread and extension to a nearby residential buildings.
According to published reports, the Los Angeles Fire Department was called at 3:37 a.m. to 12315 Gorham Avenue which resulted in a major emergency alarm classification decared and resulted in the dispatch and deployment of over 160 firefighters to the site. First arriving companies found a large townhome development with “heavy fire showing.”
Largely due to an aggressive fire attack by the LAFD, the footprint of this blaze was kept in-check and fully extinguished in one hour and 39 minutes. Fortunately, there were no injuries to any civilians or Firefighting personnel.
Additionally, five adjacent structures were evacuated for precaution. Two of those structures- one, a small apartment complex and the other, a single family dwelling, did sustain significant fire damage. As many as 10 families were displaced from those two occupancies.
Following further investigation, the LAFD stated it believed the fire was intentionally set.
Construction Site Operational Considerations (not inclusive)
Pre-Fire Plan Large Construction Projects
Understand the various Phases to a Construction Project and how they affect fire operations
Identify and train for nonconventional Strategic and Tactical operational actions
Ensure predetermined multiple alarm resources are identified and greater alarms are established
Train your Company and Command Officers to address Construction site fires
Maintain an appropriate risk profile balance with operational needs with personnel safety foremost
Clearly establish multiple Safety Offices and establish geographical resources within the incident management system for reconnaissance, communications, and oversight and focused safety monitoring
Know you water supply and system capabilities and limitations
Determine fire flow needs based upon construction phases, as these change over time as the building goes up. Match fire flow demands with resource availability (time of day gaps etc.)
Identify exposures (Physical structures and Civilians) and ensure they are calculated into the incident action plan at the right before there are identified needs or concerns
Companies shall maintain a conservative safety posture; this is not the time for overly aggressive firefighting, it is the time for smart firefighting that can be highly efficient
Always consider collapse zones: partial or complete. Stay out of them!
Respect the wind; it’s not going to help you
Consider current and projected weather conditions in your operational and tactical plans and assignments
Did I already say: Pre-fire Planning?
Be calculated in the placement of your apparatus, especially in larger scale incidents that are defined under greater geographical divisions
The fire usually consumes the available fuel load rapidly; going from a Huge fire, to one that is sometimes much more manageable; just watch and control your exposures and degree of fire extension. Don’t help to make the fire even bigger through ineffective and dysfunctional command and control
Anticipate, Project, Plan and Engage
Respect the Fire: it’s not going to play by the regular rules of combat fire suppression and engagement as in finished and enclosed structures and buildings.
Photo: Firefighters hose down smoldering embers after a large fire gutted a townhouse complex under construction in Brentwood. Credit: Al Seib / Los Angeles Times
A five-story building under construction suddenly came down on Monday afternoon in Brooklyn, New York. Three workers became trapped under the rubble after the top two floors fell onto the third, sending it all crashing to the ground, officials said. Published reports indicate that the likelihood of the weight of the concrete caused the 3rd floor to collapse onto the 2nd floor, resulting in a catastrophic and sequential progressive floor collapse.
FDNY companies searched through the pile of concrete, pulling five workers out. Investigators said concrete being poured between the metal pillars buckled the building.
The building, at 2929 Brighton Fifth Street, near Neptune Avenue (Brooklyn) fell just before 2:30 p.m. A concrete worker on the site stated according to reports that the collapse happened immediately after concrete from his truck was pumped up onto the second and third floors of the building.
Four workers were in the building at the time of the collapse, and one was in front of the building. The one in front refused medical attention. Firefighters said the framework of the building had been erected, but not much else. Removing the men from the rubble was a delicate and difficult process because of the risk of further collapse. Even after the men were removed, a large piece of corrugated metal hung in front of the building.
FDNY Twitter Feed
Additional Links
Building Collapse In Brighton Beach Claims Life Of 1 Of 5 Workers Pulled From Rubble, HERE
In response to numerous requests from our recent posting; Commercials- Got Fire? Anticipate Collapse briefing post (HERE). We have developed and produced a comprehensive download in PDF format of the entire article that can be used for training, distribution and discussions.
Click on the image above and download the PDF file and use accordingly or download HERE
There are numerous factors to be cognizant of in operations involving commercial buildings and occupancies; with special considerations and a diligent focus on a wide degree of facets on the fireground during combat fire engagement.
You need to start somewhere, thus the investment in these observations and insights for this event. Open your eyes on the fireground, there is so much to take in and respond to; if you know what to look for and can process what you’re seeing.
It is mission critical to comprehend and understand your department’s operational capabilities and the necessary deployment demands for fire suppression, fire flow and phased operations at commercial building fires.
Commercial Fire and Collapse
Respect these buildings for the occupancy risk they present and not the typical occupancy type that we develop our conventional strategies, incident action plans and tactical deployments.
It’s a lot more than that, with far greater consequences; that may be very unforgiving.
“Hal Bruno is one of the most important figures in the history of this country’s fire service. Hal died last night (November 8, 2011) at age 83. I imagine that many of the younger firefighters and a few older ones who read this site aren’t familiar with the name Hal Bruno. Hal wasn’t a fire chief and his expertise wasn’t in fireground tactics, hazardous materials, truck company or engine company operations. Hal’s specialty was firefighters. He was the best friend a firefighter and the fire service could have. But Hal Bruno wasn’t the friend who just slapped you on the back and told you what you wanted to hear. Hal cared enough to tell us all what we needed to hear. ” Dave Statter, STATter911.com Posted 11/09/2011 HERE
For more than 60 years, Hal Bruno served as an active member of the fire service community, giving selflessly as a dedicated volunteer firefighter, advocate, commentator and leader. He is renowned for his commitment to fire safety initiatives and his compassion for the members of the fire service and their families. From the NFFF Memorial Page, HERE
A recent video clip making its way around the cyber fireground clearly depicted a very close-call and resulting near miss event to four firefighters at a four alarm fire involving a commercial building that housed an established insulation manufacturer and installation contractor.
The video shows within a very compressed time frame, the progression of rapidly deteriorating interior conditions, the adverse affects on the building’s structural systems and the results from the loss of load transfers that lead to a catastrophic wall collapse narrowly missing the crew of firefighters who were operating a hand line in the vicinity of an exterior overhead door. Fortunately the injuries sustained to the firefighters were minor in nature; however the consequences and results from this collapse could have been far different and significantly more severe.
Following a series of repeated viewings of the video clip and with each successive viewing, it became readily apparent that there was a lot more to these images of the collapse and the cursory focus on the resulting near miss event. Closer examination of the video clip and the still frames brought to light some obvious conditions and indicators that easily become lost in the rapidity of the sequence of the collapse; which really has the true story to be told.
It’s the mechanism and sequence of the collapse, the dynamics of the building’s performance and the building indicators that provide a training opportunity in further examining key factors, presenting insights that could be a focus for operational and command personnel at future incidents with common parameters and gaining some mental models in recognition-primed decision making that contribute to the naturalistic decision-making process.
If you know what to be looking for, then when you see it, you may be able to anticipate, project and implement in rapid succession appropriate measures dictated by the incident.
Four Alarm Commercial Building Fire with Collapse: Fire Photo by Ben Goldberry
In an effort to promote additional insights and bring forward these fundamental observations and experienced-based presumptions extended from these and other news video images, still photographs, additional reporting research and examination, and a review of other published media resources; the following observations presented in this overview brief are being conveyed to increase firefighter, company and command level awareness of key collapse indicators such as those present at this commercial fire and to further the concept of adaptive fireground management principles and increase awareness of fundamental building performance indicators and principles to help you increase your intuitive observations skills and translate them into proactive operational actions on the fireground-before an adverse condition occurs.[ i.e., being five steps ahead of the fire conditions].
Although this briefing makes use of the images and conditions depicted in the video clip and encountered by the fire department evident in the images; the susequent commentary and insights provided are not meant to provide direct or indirect opinions, renderings, criticism or censure towards the conduct of operations or the management of the incident by the respective department and it’s firefighting, command and support personnel who operated at the actual fire and experienced this near miss event first-hand.
We are grateful that the events of this alarm precluded anything worst occurring given the potential seriousness of the prevailing incident conditions and commend the fire department and it’s firefighters that provide these exceptional services each and every day to the citizens they serve and to the community they protect, in mitigating this serious fire; safely and successfully.
This incident and the resulting near-miss captured by the videographer provides the Fire Service with an exceptional opportunity given today’s far reaching capabilities of eMedia, this web site and direct and indirect readers, links, tweets, likes, reposting’s, uploads, downloads and sharing an opportunity to share the consequences of an extreme close-call and learn from it in a positive and constructive manner, so that firefighters, company officers, commanders and support personnel can better predict with knowledge, insight and at times intuition a better understanding of buildings and the structures and occupancies we operate within on the fireground.
There are numerous inherent indicators present at every incident scene we operate at that. As is in this near miss event and building collapse; it’s sometimes the subtle things that need to gain the attention of operationg companies and personnel and the ability to rapidly process, recognize and react.
Remember this: Building Knowledge = Firefighter Safety.
As a generality; it’s important to note that given heavy fire involvement in a structure (got fire), adaptive fireground management considerations would promote conservative considerations to anticipate and expect collapse (degraded or compromise; limited or catastrophic).
In the case of fires in commercial occupancies and buildings with;
Large Square footage/Floor areas
Significant fire loads
Large open structural system spans lacking compartmentation,
Unprotected steel components and assemblies
No Sprinkler Systems
Omitted, compromised or degraded passive or active protective or suppression systems
Significant openings along the exterior building envelope
Significant opening on the roof enclosure
Deep seated fires or rapidly escalating and extending fires
It is mission critical to comprehend and understand your department’s operational capabilities and the necessary deployment demands for fire suppression, fire flow and phased operations.
Respect these buildings for the occupancy risk they present and not the typical occupancy type that we develop our strategies, incident action plans and tactical deployments. Its alot more than that, with far greater consequences that may be very unforgiving.
Aerial Plan of Building and Collapse Area A-B
The Building
The fire incident involved a single story commercial building occupying approximately 32, 200 square feet of area on a multiple building site with proximal exposures. Manufacturing, warehousing and offices comprised the building’s operational use. An aerial plan view shows the geographical building scene divisions and the location and relationship of the Alpha- Bravo Side collapse zones that affected operations and resulted in the close-call and firefighter near-miss. The proximity of exposures, physical layout and orientation can be further assessed.
A review of public documents and records, incident reports and various media resources provided the following insights;
Overview Details
Alpha Street Side View- Adapted from Google Streetmaps
The view of the alpha street side identifies the building front facade, its main office entrance (center between dual overhead doors on the left and right). Pronounced on the alpha side facade is the presence of four (4) equally spaced overhead (OH) doors that provide direct access into the building’s interior. The subsequent collapse area is depicted at the A-B corner with special attention drawn to relationship of the wall plane and OH door proximity.
The relationship and this wall surface ( area square footage) and the presence of the OH door opening to the wall/ roof interface area that subsequently became compromised and collapsed is critical in further understanding the mechanism of the collapse sequence and also the positive effect it had on the survivability of the firefighters who were within the collapse zone at the time of the wall failure.
Don’t Always Stress the Corners
It’s been a common practice and fundamental fireground consideration to define the corner of a typical building as having safety considerations and prominence in the context of ladder company operations, laddering and roof work and in the placement of personnel and positioning of fireground operations.
Corner Building Operational considerations have included, but limited to;
Provides a potentially safe(er) area of operational refuge
Provides a location to safely position ground ladders for roof access/egress
Provides a location that has a potential higher degree of assurance for maintaining structural integrity in the event of a collapse condition of an outer wall
Will not fail in a catastrophic or monolithic manner due to the postulated presence of structural members on the vicinity of either the wall enclosure and/or the roofing structural system and assemblies
The design and construction configuration and orientation of the ninety degree angle of the building’s outer wall envelope (at the corner) provides predicated inherent structural stability
The typical type of structural or envelope construction may have a resulting ninety degree building corner having a more robust resistance to collapse and compromise due to the various types of enclosure systems (methods and materials) and assemblies and needed stability per engineering principles
In this instance (as shown in the Alpha side street view), the presence of the large overhead door in close proximity to the corner wall intersection and transition ( A-B side), actually makes this position, fireground proximity and travel paths highly prone to early and complete collapse potential in the event of a loss of the wall-roof component or assembly integrity or in the load bearing/transfer capabilities of the wall-roof assembly.
The presence and identification of a corner configuration similar to this in a commercial structure should result in a higher degree of considerations and risk assessment when formulation and deploying operational assignments and in the placement of personnel for task assignments in this proximity.
This operational area should be considered as a candidate for designation as a collapse zone based upon projected or defined operational considerations, incident conditions and predictive building characteristics, systems, materials and fire dynamics and conditions.
Alpha-Bravo Corner of Subsequent Collapse Aerial View
The view from the Alpha-Bravo Corner shows the collapse zones at grade and the affected area size.
As noted in the preceding narrative, the presence of the overhead door opening along the perimeter wall enclosure and outer envelope creates a risk area that would require monitoring, periodic reconnaissance and assessment during subsequent operations to determine structural stability and potential adverse conditions.
The proximity of the opening in relationship to the corner wall, roof support and structural span of the opening results in a very delicate balance of forces, loads, reliance and dependence that must be maintained for structural integrity and equilibrium.
The entire perimeter of the alpha side could be considered for a restricted collapse zone just in terms of wall opening alone sans the degree of actual or projected interior fire impingement or fire involvement.
Take some time to view the video clip a few times over before proceeding to the next sequence of fame images.
This videographer of this video was Aaron Dohring. (all rights reserved)
Aerial Overhead view of the building perimeter walls along the four divisions ( A-D) with the A-B corner that subsequently experienced the wall-roof compromise and resulting collapse.
The A-B corner and the affected ground areas around the collapse zone. Considerations for a collapse zone area on the A-B corner would have resulted in a minimum distance of twenty five (25) feet from the building base for all operations within this area. The collapse zone on the Bravo side extends into the exposure building due to its close proximity.
Always consider the building envelope materials of construction and systems present on the building. The use of concrete masonry units (CMU) is common, as is the use of pre-cast concrete and cast-in place and tilt-up concrete construction panels.
Variations in collapse dynamics and mechanisms of collapse may result in sizable increases in collapse zone distances from the building base with consideration for monolithic or partial wall collapse as well as safety considerations for bounce and travel over long distances of modular assembly building pieces ( i.e. concrete blocks, brick venner or material chunks).
We have not discussed collapse considerations for other building envelope systems such as metal panelized systems since these have entirely different collapse considerations and profiling, not applicable to this incident and assessment insights. The same is true when considering operating and collapse considerations at commercial buildings with ordinary construction or heavy timber systems (Type or Class III and IV). These to have different rules of predictive building performance and collapse safety considerations.
Typical Interior
The interior of the building included unprotected steel components and assemblies consisting of steel columns, beams and open web steel joists. These common and conventional structural support systems provided large free clear spans, common for typical warehouse and commercial occupancies. The presence and operability of functional fire suppression sprinkler system coupled with passive and active protective devices and compartmentation can help support proactive and aggressive fire suppression efforts in those conditions that have appropriate risk determinations and balanced risk-gain benefits.
The presence of unprotected steel components ( Truss, column, structural beams etc. ) and assemblies requires an understanding of the effects of flame and heat impingement, rate of heat release and fire dynamics, potential for movement and displacement of structural components and effect on assemblies, systems and connections and the effect on structural stability, integrity and building load transfers and displacement that all can adversely affect building performance, integrity and collapse potential
Typical Structural System and Components
Interior View with Steel Columns, Open Web Steel bar Joists and Beams
Typical Open Web Steel Bar Joists w Metal Roof Deck
Large clear spans provided by the open web steel bar joists allowed for considerable free floor space typical of commercial warehouse occupancies.
Note the use of what appears to be combustible wood storage and staging areas that could have could potentially contribute towards increased fire intensity, extension and further contribute towards adverse affects on the unprotected structural steel components and assemblies.
Alpha Side Collapse Area Details: OH Door Pre-Collapse Insights
Pre-Collapse Operations on Alpha side with personnel in close proximty to the building perimeter
Pre-Collapse view of Operations on the Alpha side with personnel in close proximity, (within [a] collapse zone) to the building perimeter. It is evident that the degree of interior fire extension and involvement presumes a cautious deployment and placement of personnel in safe operational areas. When operating in such close proximity to the building wall and envelope, it becomes increasingly challenging for company officers and company personnel to monitor overall building performance indicators that may be prevalent or dominant from a view point further away from the building.
Fire extension, smoke conditions, component or assembly movement or displacement may be readily defined and identified from a vantage point away from the building, requiring additional independent operational assignments within the division if resources allow. Otherwise, officers are encouraged to get a big picture view and increase their span of vision of the building and progressing fire conditions and building performance
The pre-collapse frame image above identifies the building roof line in relationship to the ground operations, smoke conditions and also the directional flow of the elevated master stream [upper right corner]. The initial stage of the wall compromise and collapse can be seen in the Bravo wall pulling away. When watching the video, pay close attention first to the stream direction and flow and them at the location and movement of the wall, which is followed in rapid succession with the full wall collapse.
T
Close examination of the initial video frames shows the rapid displacement of the portion of the Bravo wall and outward collapse towards the B-Exposure (alleyway) Refer to the Aerial Plan for orientation. The A-B Collapse is progressing from the Bravo side to the Alpha side as loads are being transferred in rapid progression with further collapse expected.
The frame image above shows the bravo wall failing outward with the resulting loss in structural support of the roofing deck assembly.
Rapid fire migration and extension is evident after the wall section collapse with increased flames visible. In the video, one firefighter quickly recognizes the imminent collapse and reacts.
A significant section of wall area is present at the A-B side and progressing from the building corner to the left jamb of the overhead (OH) door. This area and the area directly above the OH door opening is calculated to weigh over 20,000 lbs.
The early identification and establishment of collapse zone(s) is mission critical especially at commercial buildings due to the considerations for rapidly changing operational conditions that may be a result of or influenced by the following;
lack of knowledge or understanding of the building’s construction, systems and characteristics
lack of adequate resources, skills and or capabilities for selected phase operations
fire loading, combustibles, flammables and other products
Last of or loss of compartmentation
fire and protective systems failures or inoperability
unapproved alterations, additions and renovations to the building, systems and occupancy
transitions for offensive to defensive operational phases, which at times may results in operating position postures too close to the building
failure to recognize situational factors that will drive appropriate operational phasing and task deployments
lack of building performance knowledge
not considering occupancy risk versus treating the building/fire relationship based upon occupancy type
not recognizing key collapse indicators and failing to implement timely actions [proactively versus reactionary]
being four steps behind the fire conditions evident instead of implementing adaptive fire ground management insights [five steps ahead of the evident fire]
use precise coordination when placing elevated masterstreams into operations with ground personnel operating within close quarters
understand the effects of master streams on the integrity of building features, assemblies and components
The image frame above shows personnel operating within an imminent collapse zone directing hand lines into the interior fire area. Further examination of the video frames clearly shows one firefighter quickly recognizing that a collapse is occurring and attempts to alert the other personnel to retreat. Simultaneously to the collapse progression, the crew immediately retreats away from the collapsing wall and falling building materials.
Within the span of four seconds, the wall compromise occurs and collapses on the ground at the A-B corner and immediate area on the alpha side. The slightly monolithic manner in which the wall plane first peels away and progressively collapsed is interesting for a CMU wall. Possibly due to the outward collapse of the Bravo wall, followed by the rapid succession of failure of the roof-wall connection interface resulted in an transitional downward force that pushed the alpha side wall outward allowing gravity to work its force
When operating in close proximity to a heavily involved forward interior condition [exterior position] it is important to maintain focused situational awareness and either directly maintain or delegate responsibilities for observations of fire and smoke progress and conditions while monitoring key functional building performance indicators and collapse pre-cursors.
Additionally, always re-evaluate the effectiveness of deployed and operational hose lines, streams and in water application to ensure they are adequate for the degree of fire suppression being undertaken and the corresponding fire flow requirements. Don’t just assume, determine with validity. [ Refer to Tactical Entertainment]
Obscured by the rapidly defining smoke which is a result of the developing and extending collapse, the frame image 04 below depicts the beginning of the compromise and collapse sequence commencing as a result of the Bravo wall compromise and collapse sequence at the B-A corner that will subsequently peel towards the Alpha side and continue up to the outermost jamb of the overhead door.
Pay particular attention to the first three to four seconds of the video clip and review the video clip over a few times; looking at the operating elevated master stream that is clearly visible and operating from the upper right part of the screen through the smoke plume; follow the direct orientation and stream flowing directly towards the bravo wall plane, and presumed penetrating into/through the roof deck or impacting through the metal roof deck and wall-roof assembly area at the upper roof edge.
Image 04
Frame image 04 depicts the rapidly deteriorating conditions that are evident as the collapse sequence continues and the overhead door jamb (left) buckling and adjacent wall failing by way of an outward curl or peel away commencing from the upper (left image) A-B corner at the roof line and then peeling and failing from upper left to right.
Image 05
The leading edge of the outward collapsing wall plane ( yellow dotted line) is failing with the greatest material concentration occurring at the A-B edge outward. Fortunately the presence and location of the overhead door opening lessened the amount and location of wall material ( concrete masonry units-CMU) and contributed to a void area being present and not fully impacting the firefighters who were operating within this collapse zone.
In other words, had this been a solid full wall collapse likelihood for significant firefighter injury would have resulted.
The affects of wall/roof compromise should be of focused consideration and monitoring when managing incidents of this size and magnitude in similar occupancies and building features. Flame and heat impingment can and will affect the structural integrity of lintels spans, beams and truss connects along roof lines and connections. Look for signs of impingment, degradation or compromise. watch for signs of probable inward/outward or curtain wall collapse.
Image 06
The remaining images, frames 06 and 07 depict the location of the firefighters to the wall collapse, the relationship to the wall and roof system and the degree of wall area that became compromised and collapsed.
Image 07
This brief video clip and these accompanying briefing insights provided a tremendous opportunity to examine in a non-critical manner an actual near miss collapse event and operational discernments that provide a focused training an awareness opportunity.
When given the time to analyze and assess, some things become so apparent and self-revealing that we might prematurely say why didn’t someone pick up that or those conditions while conducting operations at [an] incident. It is dependent on a wide variety of factors, conditions and parameters that are difficult at times to identify and harder yet to fully identify as common or contributing factors, errors or omissions.
It’s not always that easy; but contradictory – some time it really is (or should be) that easy.
Some things on the fireground may not be prone to being so readily identifiable or recognized.
It all depends what you’re looking for and whether you have the necessary insights, knowledge and skill sets. Incident priorities, demands, situational focus, awareness or disconnect all may have a part in how and incident is managed and mitigated.
It goes back directly on knowing what to look for and when; at what type of building with which type of occupancy and under what stage or stages of fire development and combat operations or engagement you might be in. It complex, it takes time and experience and learning’s.
There are numerous factors to be cognizant of in operations involving commercial buildings and occupancies; with special considerations and a diligent focus on a wide degree of facets on the fireground during combat fire engagement.
You need to start somewhere, thus the investment in these observations and insights for this event. Open your eyes on the fireground, there is so much to take in and respond to; if you know what to look for and can process what you’re seeing.
It is mission critical to comprehend and understand your department’s operational capabilities and the necessary deployment demands for fire suppression, fire flow and phased operations. Respect these buildings for the occupancy risk they present and not the typical occupancy type that we develop our conventional strategies, incident action plans and tactical deployments. It’s a lot more than that, with far greater consequences; that may be very unforgiving.
An image from a NIST computer model shows temperature levels during the 2007 Charleston Sofa Super Store fire. Dark blue is ambient temperature; bright red is about 800 degrees C (1500 degrees F). Credit: NIST
Fire Modeling Software
These fire simulation programs were developed or sponsored by the Fire Research Division at the NIST. The list of programs is divided into two broad categories below: currently-supported software and archival (unsupported) software. In order to get further information or to obtain one of the programs, click on the appropriate name.
Current Software
These models are being actively developed and supported by the laboratory. Details of the software, including download, development, and support information are included on the individual web pages for each model.
FDS (Fire Dynamics Simulator) is a computational fluid dynamics (CFD) model of fire-driven fluid flow. The software solves numerically a form of the Navier-Stokes equations appropriate for low-speed, thermally-driven flow, with an emphasis on smoke and heat transport from fires.
These models are included largely for reference or historical interest and span several decades of development of computational tools in fire research at NIST. As such, they are largely unsupported due to the age of the software.
ALOFT-FTTM (A Large Outdoor Fire plume Trajectory model – Flat Terrain) is a computer based model to predict the downwind distribution of smoke particulate and combustion products from large outdoor fires. It solves the fundamental fluid dynamic equations for the smoke plume and its surroundings with flat terrain. The program contains a graphical user interface for input and output and a user modifiable database of fuel and smoke emission parameters. The output can be displayed as downwind, crosswind and vertical smoke concentration contours. Information on using the program is available with on-line help commands in the program.
ASCOS (Analysis of Smoke Control Systems) is a program for steady air flow analysis of smoke control systems. This program can analyze any smoke control system that produces pressure differences with the intent of limiting smoke movement in building fire situations. The program is also capable of modeling the stack effect created in taller buildings during extreme temperature conditions. The program input consists of the outside and building temperatures, a description of the building flow network and the flows produced by the ventilation or smoke control system. The output consists of the steady state pressures and flows throughout the building. Another newer program, CONTAM, may be more appropriate to some applications than ASCOS.
ASET-B (Available Safe Egress Time – BASIC) is a program for calculating the temperature and position of the hot smoke layer in a single room with closed doors and windows. ASET-B is a compact easy to run program which solves the same equations as ASET. The required program inputs are a heat loss fraction, the height of the fire, the room ceiling height, the room floor area, the maximum time for the simulation, and the rate of heat release of the fire. The program outputs are the temperature and thickness of the hot smoke layer as a function of time.
ASMET (Atria Smoke Management Engineering Tools) consists of a set of equations and a zone fire model for analysis of smoke management systems for large spaces such as atria, shopping malls, arcades, sports arenas, exhibition halls and airplane hangers. ASMET is written in C++ language. For program documentation and a description of the input data, the user should refer to NISTIR 5516, Klote, J. H., Method of Predicting Smoke Movement in Atria with Application to Smoke Management, NIST.
BREAK1 (Berkeley Algorithm for Breaking Window Glass in a Compartment Fire) is a program which calculates the temperature history of a glass window exposed to user described fire conditions. The calculations are stopped when the glass breaks. The inputs required are the glass thermal conductivity, thermal diffusivity, absorption length, breaking stress, Young’s modulus, thermal coefficient of linear expansion, thickness, emissivity, shading thickness, half-width of window, the ambient temperature, numerical parameters and the time histories of flame radiation from the fire, hot layer temperature and emissivity, and heat transfer coefficients. The outputs are temperature history of the glass normal to the glass surface, and the window breakage time.
CCFM (Consolidated Compartment Fire Model version VENTS) is a two-layer zone-type compartment fire model computer code. It simulates conditions due to user-specified fires in a multi-room, multi-level facility. The required inputs are a description of room geometry and vent characteristics (up to 9 rooms, 20 vents), initial state of the inside and outside environment, and fire energy release rates as a functions of time (up to 20 fires). If simulation of concentrations of products of combustion is desired, then product release rates must also be specified (up to three products). Vents can be simple openings between adjacent spaces (natural vents) or fan/duct forced ventilation systems between arbitrary pairs of spaces (forced vents). For forced vents, flow rates and direction can be user-specified or included in the simulation by accounting for user-specified fan and duct characteristics. Wind and stack effects can be taken into account. The program outputs for each room are pressure at the floor, layer interface height, upper/lower layer temperature and (optionally) product concentrations.
DETACT-QS and DETACT-T2
DETACT-QS (DETector ACTuation – Quasi Steady) is a program for calculating the actuation time of thermal devices below unconfined ceilings. It can be used to predict the actuation time of fixed temperature heat detectors and sprinkler heads subject to a user specified fire. DETACT-QS assumes that the thermal device is located in a relatively large area, that is only the fire ceiling flow heats the device and there is no heating from the accumulated hot gases in the room. The required program inputs are the height of the ceiling above the fuel, the distance of the thermal device from the axis of the fire, the actuation temperature of the thermal device, the response time index (RTI) for the device, and the rate of heat release of the fire. The program outputs are the ceiling gas temperature and the device temperature both as a function of time and the time required for device actuation. DETACT-T2 (DETector ACTuation – Time squared) is a program for calculating the actuation time of thermal devices below unconfined ceilings. It can be used to predict the actuation time of fixed temperature and rate of rise heat detectors, and sprinkler heads subject to a user specified fire which grows as the square of time. CT-T2 assumes that the thermal device is located in a relatively large area, that is only the fire ceiling flow heats the device and there is no heating from the accumulated hot gases in the room. The required program inputs are the ambient temperature, the response time index (RTI) for the device, the activation and rate of rise temperatures of the device, height of the ceiling above the fuel, the device spacing and the fire growth rate. The program outputs are the time to device activation and the heat release rate at activation.
ELVAC (Elevator Evacuation) is an interactive computer program that estimates the time required to evacuate people from a building with the use of elevators and stairs. It is cautioned that elevators generally are not intended as a means of fire evacuation, and they should not be used during fires. However, it is possible to design elevator systems that for fire emergencies, and ELVAC can be used to evaluate the potential performance of such systems. ELVAC calculates the evacuation time for one group of elevators. If a building has more than one group of elevators, ELVAC can be run on each group separately. Input consists of floor to floor heights, number of people on floors, number of elevators in the group, elevator speed, elevator acceleration, elevator capacity, elevator door type and width, and various inefficiency factors. The output is a table of elevator travel time, round trip time, people moved, and number of round trips for each floor plus the total evacuation time.
FIRDEMND simulates the suppression of post flashover charring and non-charring solid-fuel fires in compartments using water sprays from portable hose-nozzle equipment used by the fire departments. The output of the Fire Demand Model (FDM) shows the extinguishing effects of water spray at various flow rates and droplet sizes. The calculations are based on a heat and mass balance accounting for gas and surface cooling, steam-induced smothering, water-spray induced air entrainment, direct extinguishment of the fire by water and the energy transport via inflow and outflow of heat and products of combustion.
FIRST (FIRe Simulation Technique) is the direct descendant of the HARVARD V program developed by Howard Emmons and Henri Mitler. The fire may be entered either as a user-specified time-dependent mass loss rate or in terms of fundamental properties of the fuel. In the latter case, the program will predict the fire growth rate by considering the changing oxygen concentration and smoke layer conditions in the room of fire origin. It can also predict the heating and possible ignition of up to three targets. The original fire and targets may also be user specified fires. The required program inputs are the geometrical data describing the rooms and openings, and the thermophysical properties of the ceiling, walls, burning fuel, and targets. The generation rate of soot must be specified, and the generation rates of other species may be specified as a yield of the pyrolysis rate. Among the program outputs are the temperature and thickness of, and species concentrations in, the hot upper layer and also in the cooler, lower layer in each compartment. Also given are wall surface temperatures, heat transfer rates and mass flow rates. MASBANK is used to create and maintain a data base of materials and their fire properties for use by the FIRST program. MASBANK can accommodate 20 properties for up to 50 materials. The program has the capability to add, delete, change, alphabetize and view the material properties in the data bank. Material properties from MASBANK may be transferred directly into the FIRST program.
Jet is a model for the prediction of detector activation and gas temperature in the presence of a smoke layer.
FPETool (Software and Documentation) is a set of engineering equations useful in estimating potential fire hazard and the response of the space and fire protection systems to the developing hazard. Version 3.2 incorporates an estimate of smoke conditions developing within a room receiving steady-state smoke leakage from an adjacent space. Estimates of human viability resulting from exposure to developing conditions within the room are calculated based upon the smoke temperature and toxicity.
LAVENT is a program developed to simulate the environment and the response of sprinkler links in compartment fires with draft curtains and fusible link operated ceiling vents. The model, used to calculate the heating of the fusible links, includes the effects of the ceiling jet and the upper layer of hot gases beneath the ceiling. The required program inputs are the geometrical data describing the compartment, the thermophysical properties of the ceiling, the fire elevation, the time dependent energy release rate of the fire, the fire diameter or energy release rate per area of the fire, the ceiling vent area, the fusible link response-time-index (RTI) and fuse temperature, the fusible link positions along the ceiling, the link assignment to each ceiling vent, and the ambient temperature. A maximum of five ceiling vents and ten fusible links are permitted in the compartment. The program outputs are the temperature, mass and height of the hot upper layer, the temperature of each link, the ceiling jet temperature and velocity at each link, the radial temperature distribution along the interior surface of the ceiling, the radial distribution of the heat flux to the interior and exterior surfaces of the ceiling, the fuse time of each link, and the vent area that has been opened.GRAPH is a graphics program which runs in conjunction with LAVENT. The results for LAVENT are sent to the data file, GRAPH.OUT, after each prescribed time step. GRAPH then allows the user to choose two sets of variables to be plotted on the screen and has the additional capability of hardcopy output.
These fire simulation programs were developed or sponsored by the Building and Fire Research Laboratory. In order to get further information or to obtain one of the programs, click on the appropriate name.
ALOFT-FTTM- A Large Outdoor Fire plume Trajectory model – Flat Terrain
FASTLite- A collection of procedures which builds on the core routines of FIREFORM and the computer model CFAST to provide engineering calculations of various fire phenomena,
FPETool- Fire Protection Engineering Tools (equations and fire simulation scenarios)
Jet- A Model for the Prediction of Detector Activation and Gas Temperature in the Presence of a Smoke Layer
LAVENT- Response of sprinkler links in compartment fires with curtains and ceiling vents
NIST Fire Dynamics Simulator and Smokeview – The NIST Fire Dynamics Simulator predicts smoke and/or air flow movement caused by fire, wind, ventilation systems etc. Smokeview visualizes the predictions generated by NIST FDS.
Using Fire Models to Understand Fire BehaviorNIST’s fire modeling capabilities can help firefighters understand and predict fire conditions, HERE
On FirefighterNetcast.com Wednesday November 2, 2011 Postponed from October
On Live Tonight November 2, 2011 at 9 PM ET on FireFighterNetcast.com
Taking it From the Streets and Delivering it From the Chief’s Office;
An exciting and dynamic discussion that integrates the insights from Christopher Naum’s Taking it to the Streets perspectives to Chief Doug Cline’s Chief’s Bugle visions. FirefighterNetcast.com is proud to present an insightful look at today’s leading issues affecting the American Fire Service from the perspective of the street firefighter, officer and commander and the perspective from the executive and chief officers and commanders- the Chief’s perspective.
This program’s theme and discussion will concentrate on the challenges of maintaining a balanced approach towards integrating effective risk management, with the demands for effective and highly efficient firefighting; while promoting safety, hazard reduction and injury and LODD reduction with conventional decision-making.
Tune in Wednesday night October 26, 2011, 9pm ET on FirefighterNetcast.com for a 10-Alarm Discussion with these visionary national fire service leaders and their special guests.
Join in on the live open discussion with other fire service personnel from around the country.
Without understanding the building-occupancy relationships and integrating; construction, occupancies, fire dynamics and fire behavior, risk, analysis, the art and science of firefighting, safety conscious work environment concepts and effective and well-informed incident command management, company level supervision and task level competencies…You are derelict and negligent and "not "everyone may be going home".
Our current generation of buildings, construction and occupancies are not as predictable as past conventional construction; risk assessment, strategies and tactics must change to address these new rules of structural fire engagement. There is a need to gain the building construction knowledge and insights and to change and adjust operating profiles in order to safe guard companies, personnel and team compositions. It's all about understanding the building-occupancy relationships and the art and science of firefighting, Building Knowledge = Firefighter Safety (Bk=F2S)
The Newest radio show on FireFighter Netcast.com at Blogtalk Radio… Taking it to the Streets with Christopher Naum. On the Air Monthly on Firefighter Netcast.com. A Buildingsonfire.com Series and Firefighter Netcast.com Production. Advancing Firefighter Safety and Operational Integrity for the Fire Service through provocative insights and dynamic discussions dedicated to the Art and Science of Firefighting and the Traditions of the Fire Service.
