Abstract

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Title:: Structural Vulnerability Analysis on Single Degree of Freedom System Based on Capacity Spectrum Method

Author(s):: GONG Jin-xin; ZHANG Qin; CHENG Ling; Faculty of Infrastructure Engineering, Dalian University of Technology

Keywords:: SDOF system; seismic vulnerability; elasticplastic time history analysis; capacity spectrum method; statistical analysis

Abstract:: In order to analyse the structural seismic vulnerability based on capacity spectrum method, elasticplastic and elastic time history analysis under 250 selected seismic wave records were made for structure of single degree of freedom (SDOF) systems. Pushover analysis, whose respond spectrum was generated by the elasticplastic timehistory analysis under the same seismic wave records, was carried out. The relationship among the mean and variation coefficient of ratio of maximum displacement from elastic analysis to Pushover analysis with the relevant parameters were set. The probabilistic characteristic of the maximum displacement obtained from Pushover analysis of stochastic structures were generated by MonteCarlo method according to the probability distribution of structural parameters. Based on the reliability theory, the expressions for calculating the vulnerability probability and reliability index were presented. The proposed method for vulnerability analysis can conceivably substitute the timeconsuming process of traditional timehistory method by Pushover analysis.