Evolution of Predicted Seismic Performance for Wood-Frame Buildings
Publication: Journal of Architectural Engineering
Volume 22, Issue 3
Abstract
Following natural disasters, major changes are often adopted in design codes, provisions, and guidelines that highlight existing or perceived deficiencies in design code calibration and sometimes design philosophy. The work presented herein chronicles the evolution of seismic design for wood-frame buildings from 1959 through current state-of-the-art methodologies available as of 2015. Included in the approaches in this study were two performance-based seismic retrofit levels and a soft-story-only retrofit design that followed a recent guideline published by FEMA. A brief background on the historical significance and major changes adopted in each provision or guideline is provided. Building performance was quantified and compared using multirecord fragilities for a range of wood-frame building types for the historical seismic provisions, demonstrating that the predicted seismic performance of wood-frame buildings has improved over time. It was also demonstrated that performance-based seismic retrofits can be designed to multiple levels of seismic performance, including a superior level, which provides immediate occupancy of all building types following maximum considered earthquake (MCE) ground motions. The superior-level retrofit reduced the predicted peak interstory drift of a 3-story soft-story building by 90%. The information gained in this study can be incorporated into community loss estimation models and used to expand the knowledge base on how seismic risk has changed over time with respect to the wood-frame building inventory.
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Acknowledgments
The authors acknowledge support from the George T. Abell Professorship funds at Colorado State University. The authors also thank Bradford Douglas, Philip Line, Gary Mochizuki, Tim Kaucher, Michelle Kam-Biron, Doug Thompson, and Mikhail Gershfeld for their help in obtaining copies of many of the codes and provisions used in this study. The authors gratefully acknowledge partial support for this study from National Science Foundation Grant CMMI-1314957.
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Information & Authors
Information
Published In
Journal of Architectural Engineering
Volume 22 • Issue 3 • September 2016
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Sep 4, 2015
Accepted: Jan 12, 2016
Published online: Mar 9, 2016
Discussion open until: Aug 9, 2016
Published in print: Sep 1, 2016
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