首页 | 本学科首页   官方微博 | 高级检索  
     检索      


A framework for the evaluation of ground motion selection and modification procedures
Authors:N Simon Kwong  Anil K Chopra  Robin K McGuire
Institution:1. Department of Civil and Environmental Engineering, University of California Berkeley, Berkeley, CA 94720, U.S.A.;2. Lettis Consultants International, Inc., Boulder, CO 80305, U.S.A.
Abstract:This study develops a framework to evaluate ground motion selection and modification (GMSM) procedures. The context is probabilistic seismic demand analysis, where response history analyses of a given structure, using ground motions determined by a GMSM procedure, are performed in order to estimate the seismic demand hazard curve (SDHC) for the structure at a given site. Currently, a GMSM procedure is evaluated in this context by comparing several resulting estimates of the SDHC, each derived from a different definition of the conditioning intensity measure (IM). Using a simple case study, we demonstrate that conclusions from such an approach are not always definitive; therefore, an alternative approach is desirable. In the alternative proposed herein, all estimates of the SDHC from GMSM procedures are compared against a benchmark SDHC, under a common set of ground motion information. This benchmark SDHC is determined by incorporating a prediction model for the seismic demand into the probabilistic seismic hazard analysis calculations. To develop an understanding of why one GMSM procedure may provide more accurate estimates of the SDHC than another procedure, we identify the role of ‘IM sufficiency’ in the relationship between (i) bias in the SDHC estimate and (ii) ‘hazard consistency’ of the corresponding ground motions obtained from a GMSM procedure. Finally, we provide examples of how misleading conclusions may potentially be obtained from erroneous implementations of the proposed framework. Copyright © 2014 John Wiley & Sons, Ltd.
Keywords:ground motion selection  evaluation of GMSM procedures  nonlinear response history analysis  seismic demand hazard curve  benchmark  probabilistic seismic hazard analysis  probabilistic seismic demand analysis  IM sufficiency  hazard consistency
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号