Significance of Modeling Deterioration in Structural Components for Predicting the Collapse Potential of Structures Under Earthquake Excitations
The paper presents a summary of the state of knowledge in structural component and system modeling for predicting the collapse potential of buildings structural systems. In this context, collapse implies dynamic instability in a sidesway mode, usually triggered by large story drifts that are amplified by structure P-Δ effects and deterioration in strength and stiffness of the components of the system. The collapse capacity of a building is defined as the maximum ground motion intensity (often represented by the spectral acceleration at the first mode period) at which the structural system still maintains dynamic stability. A collapse fragility curve that incorporates aleatory uncertainty due to record-to-record (RTR) variability is obtained by ordering the collapse capacities for a representative set of ground motions. Realistic modeling of deterioration is found to be the most essential aspect of collapse prediction through nonlinear dynamic analysis.
Much of this research was supported by the NSF sponsored Pacific Earthquake Engineering Research (PEER) Center. Additional support was provided by the National Science Foundation (NSF) through Grant No. CMS-0421551 as part of the George E. Brown, Jr. Network for Earthquake Engineering Simulation Consortium Operations, and by a grant of the CUREE-Kajima Phase VI research program. All support is gratefully appreciated. Any opinions, findings, and conclusions or recommendations expressed in this paper are those of the authors and do not necessarily reflect the views of the sponsors.
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