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

106 بازدید

Most buildings in the United States are less than five stories tall. These low-rise buildings typically possess fundamental periods less than one-half second and thus are referred to as short-period buildings. Many commonly used analytical models have predicted that short-period buildings designed to current building codes are likely to suffer severe damage or collapse during design-level earthquakes. However, post-earthquake field investigations have not confirmed these predictions. Since this uncertainty is found across all types of building structures and construction materials permitted by current building codes and standards, it decreases confidence in the earthquake resilience of such code-compliant buildings. This technical resource series provides the findings and conclusions related to this issue and recommendations for improving seismic design of short-period buildings.
The National Earthquake Hazards Reduction Program (NEHRP) at the Federal Emergency Management Agency (FEMA) has a responsibility to help translate and implement new knowledge and research results to increase earthquake resilience nationwide. This FEMA-supported multi-year project series has successfully applied new analytical modeling techniques to investigate the long-standing problem of short-period building seismic collapse performance. This report is the fourth volume of the series, and it summarizes a study on one-to-four story steel special concentrically braced frame buildings designed in accordance with the ASCE/SEI 7-10 standard for high-seismic regions. The study has examined various contributing factors to the uncertainty. Through advanced modeling and parametric evaluation, the study has shown that the uncertainty can be resolved and further improvements to seismic design of steel braced frame buildings can be achieved.
FEMA is grateful to the Applied Technology Council (ATC) for managing this sophisticated multi-year project series to a successful completion, to the Project Technical Committee and the Project Review Panel for their dedicated effort leading to invaluable technical findings and recommendations. FEMA is also thankful to the project workshop participants for their scrutiny and valuable comments. Resolving the uncertainty in short-period building seismic collapse performance will strengthen confidence in seismic building codes. This project series will also contribute to improving seismic design and predicting collapse potential of short-period buildings in high-seismic communities in the nation.
Federal Emergency Management Agency

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