Now Available! Update of FEMA P-58 Series

ATC is pleased to announce the availability of the FEMA P-58 Series, Seismic Performance Assessment of Buildings, Methodology and Implementation, prepared by the Applied Technology Council (ATC) for the Federal Emergency Management Agency (FEMA).

FEMA P-58 Volumes 1-3 were originally published in 2012. A revised version of these volumes, plus four new volumes, new tools, and background documentation are all now available for immediate download.

Now Available!

FEMA P-2012, Assessing Seismic Performance of Buildings with Configuration Irregularities

Bill Coulbourne, ATC Director of Wind and Flood Hazard Mitigation, deployed to Tuscaloosa, AL with a team sponsored by the National Science Foundation (NSF) and led by Dr. David Prevatt of the University of Florida. Dr. Prevatt and the other university researchers focused on the performance of wood frame buildings with the expectation to discover ways to improve wood frame buildings when impacted by tornadoes with lower wind speeds (EF0 to EF3). The team was able to investigate the failure mechanisms of approximately 150 buildings along a 6 mile long track of the tornado. The information collected will be used to determine how the building structures might be improved to allow people to stay alive in their homes during a tornadic event.

The picture below shows an apartment complex damaged with what the team believes was a tornado strengthened to an EF5 category (the most severe with wind speeds at or above 200 mph). There were several fatalities reported here. The buildings were built in 2010. This site is expected to be studied in order to learn how to build buildings that survive tornadoes weaker than EF5.

The next picture shows a residential structure damaged by tornado wind speeds equivalent to an EF4. A couple and their dog survived this severe damage by huddling in the center of the house. When the storm passed,  several walls collapsed on top of them seemingly saving all three of them from severe injury as the rest of the house was demolished. While there was a below-grade cellar just behind the house, the occupants never had the chance to get into the cellar for more protection.



What's New?

What's New? The ATC Hazards by Location website allows the user to find site-specific basic wind speeds, ground snow loads, tornado design wind loads, and seismic loads used in the standards published by the American Society of Civil Engineers, National Earthquake Hazards Reduction Program, and International Building Code. This website was developed with the financial help of the ATC Endowment Fund, Federal Emergency Management Agency (FEMA), Insurance Institute for Business & Home Safety (IBHS), and Metal Building Manufacturers Association (MBMA), and is free of charge to users.

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Available Products. The library of completed ATC products includes more than 100 publications on key issues in structural, earthquake, wind, and coastal engineering.  Some are available as free downloads and others can be purchased through ATC’s newly updated online store.   More…

Projects. With funding from various government agencies and the ATC Endowment Fund, ATC is actively engaged in a broad range of funded technical projects to mitigate the effects of natural and other hazards on the built environment.

Events. Periodically ATC conducts seminars, conferences, workshops, webinars, and other meetings to document and advance the state of structural engineering practice and to identify research needs.  Registration for these events can be made through the “Events” section of this website.  ATC also has the ability to provide an instructor to conduct your ATC-20 and ATC-45 in-person trainings, and information about these options is available under On Demand Training in the Product menu above.