Short-Period Building Collapse Performance and Recommendations for Improving Seismic Design

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Short-Period Building Collapse Series (ZIP)
FEMA P-2139 | December 2020

Recent analytical studies investigating a wide range of modern seismic-force-resisting systems have predicted collapse rates for short-period buildings that are significantly larger than those observed in earthquakes during the past 50 years. This gap between analytically predicted and historically observed collapse rates in known as the short-period building seismic performance paradox. Additionally, analytically predicted collapse rates for short-period buildings are generally larger than maximum collapse rates used in national model codes and standards to establish seismic design requirements.

The FEMA P-2139 series of reports documents a multi-year investigation of the response behavior and collapse performance of different structural systems to identify causes and develop solutions for the short-period building seismic performance paradox. Studies investigated three structural systems: wood light-frame, special reinforced masonry shear wall, and steel special concentrically braced frame systems. Volume 1 summarizes results, conclusions, and recommendations from the three-system.