Formulation of Seismic Fragilities for a Wood-Frame Building Based on Visually Determined Damage Indexes
Publication: Journal of Performance of Constructed Facilities
Volume 23, Issue 5
Abstract
The study of earthquake engineering has made significant strides over the last one-half century with scientists developing methods to better understand the basis and mechanisms of earthquakes and engineers working to mitigate economic loss and fatalities. A paradigm known as performance-based seismic design (PBSD) not only provides life safety to building occupants, but seeks to control structural and nonstructural damage in buildings and other structures. The development of fragility curves based on the well-known Park-Ang damage index is examined herein. This type of formulation can provide the information needed to assess the seismic vulnerability of a structure. Existing shake table test data from the NEESWood Project’s test of a (1,800 sq ft) two-story house was combined with a participant survey to calibrate a damage model. The result was the development of damage fragilities based exclusively on nonlinear time history analysis. Then, the proposed numerical damage model was applied and fragility curves were developed for a six-story light-frame wood condominium building. The results appear logical based on observations of system-level shake table tests over the last decade, and thus the method shows promise provided significant torsion is not present in the system.
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Acknowledgments
The data used in this paper were from the work supported by the National Science Foundation under Grant Nos. NSFCMS-0529903 (NEES Research) (The NEESWood Project) and NSFCMS-0402490 (NEES Operation). Any opinions, findings, and conclusions or recommendations expressed in this material are those of the writer(s) and do not necessarily reflect the views of the National Science Foundation or the research team that generated that data experimentally. The use of the data and access to the NEES data repository to develop the model in this paper is sincerely appreciated.
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Information & Authors
Information
Published In
Journal of Performance of Constructed Facilities
Volume 23 • Issue 5 • October 2009
Pages: 346 - 352
Copyright
© 2009 ASCE.
History
Received: Sep 2, 2008
Accepted: Feb 12, 2009
Published online: Sep 15, 2009
Published in print: Oct 2009
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