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Selection and modification of ground motion records using Newmark-Hall spectrum as target spectrum for long-period structures

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Earthquake Engineering and Engineering Vibration 2023年第1期22卷 117-134页

作者： Fu Jianyu Wang Dongsheng Zhang Rui Chen Xiaoyu School of Civil and Transportation Engineering Hebei University of TechnologyTianjin 300401China School of Civil Engineering Dalian Jiaotong UniversityDalian 116028China Institute of Road and Bridge Engineering Dalian Maritime UniversityDalian 116026China

Input ground motions have significant impacts on the uncertainty of structural responses in time-history analysis.In this study,records were selected and scaled for the evaluation of mean structural responses according to the target spectrum.The Newmark-Hall spectrum is closely related to seismic response of short,medium and long-period structures,so it was taken as the target spectrum here.The nonlinear time-history analyses of 9-story and 20-story steel moment-resisting frame structures were carried out as examples.They represent medium and long-period buildings,respectively.Three target spectra with risk of 50%,10%and 2%probabilities for exceedance in 50 years were calculated by the average Newmark-Hall spectrum method for three ground motion sets developed in the SAC Steel Project.The predicted structural mean responses of these Newmark-Hall spectra were compared with those calculated by the average spectral acceleration method for the same record set.It is found that both methods have similar accuracy for estimating the structural mean response.However,the method proposed herein is more effective in reducing the variability of the structural responses.Also,the proposed method is more advantageous for the time-history analysis of long-period structures or structures with more severe nonlinear responses under strong seismic excitations.

关键词： time-history analysis selection and modification of ground motions target spectrum Newmark-Hall spectrum steel moment resisting frame structure

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