Inelastic Displacement Ratios of Degrading Systems
Publication: Journal of Structural Engineering
Volume 134, Issue 6
Abstract
Seismic code provisions in several countries have recently adopted the new concept of performance-based design. New analysis procedures have been developed to estimate seismic demands for performance evaluation. Most of these procedures are based on simple material models though, and do not take into account degradation effects, a major factor influencing structural behavior under earthquake excitations. More importantly, most of these models cannot predict collapse of structures under seismic loads. This study presents a newly developed model that incorporates degradation effects into seismic analysis of structures. A new energy-based approach is used to define several types of degradation effects. The model also permits collapse prediction of structures under seismic excitations. The model was used to conduct extensive statistical dynamic analysis of different structural systems subjected to a large ensemble of recent earthquake records. The results were used to propose approximate methods for estimating maximum inelastic displacements of degrading systems for use in performance-based seismic code provisions. The findings provide necessary information for the design evaluation phase of a performance-based earthquake design process, and could be used for evaluation and modification of existing seismic codes of practice.
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Acknowledgments
The second writer would like to express his deepest gratitude to Prof. Helmut Krawinkler, his postdoctoral advisor at Stanford University, for several fruitful discussions regarding the seismic behavior and analytical implementation of degrading structural systems, which constituted the basis of this work. This material is based upon work supported by the National Science Foundation under Grant No. NSF0448590. The writers greatly acknowledge the support of NSF.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 134 • Issue 6 • June 2008
Pages: 1030 - 1045
Copyright
© 2008 ASCE.
History
Received: Jun 7, 2006
Accepted: Oct 8, 2007
Published online: Jun 1, 2008
Published in print: Jun 2008
Notes
Note. Associate Editor: Rakesh K. Goel
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