Damage-Based Seismic Reliability Concept for Woodframe Structures
Publication: Journal of Structural Engineering
Volume 131, Issue 4
Abstract
In the United States the majority of modern residential and a portion of commercial structures are woodframe construction which typically consists of dimension lumber sheathed with OSB or plywood panels. This paper presents the results of a study on the development of a damage-based seismic reliability model for light-frame wood structures subject to earthquake load. It is presented in conceptual form with a simple example for a symmetric one-story woodframe building. The concept presented here provides the basic methodology to calibrate a seismic damage model and compute the structural reliability using a damage-based limit state function. The illustrative example necessitated a small experimental program and the use of existing software. The mechanistic damage model chosen for the example expresses damage as a linear combination of the maximum displacement during an earthquake simulation and the hysteretic energy dissipated by each shearwall within a structure. In order to make the model mechanistic, it was regressively calibrated based on the results of static and dynamic tests conducted on wood shearwalls. The fastener spacing on the perimeter of the shearwall sheathing panels was chosen as the design variable of interest, hence all damage model parameters were developed as a function of their spacing. Following calibration, a damaged-based limit state for reliability analysis is developed that enables one to calculate the structural reliability index provided against a prescribed damage level. The result for an example limit state is presented and compared to Federal Emergency Management Agency transient drift performance specifications for collapse prevention.
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Acknowledgments
The writer would like to acknowledge the partial support of the Federal Emergency Management Agency through the Michigan State Police Hazard Mitigation Grant No. FEMA-MI-1346. The writer would also like to thank Henrique “Kiko” de Melo e Silva for performing the wood shearwall tests, and also extends his gratitude to the anonymous reviewers for their suggestions for improving the final version of this paper
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 131 • Issue 4 • April 2005
Pages: 668 - 675
Copyright
© 2005 ASCE.
History
Received: Dec 17, 2003
Accepted: Oct 11, 2004
Published online: Apr 1, 2005
Published in print: Apr 2005
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