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发表时间：2022-10-06

发表刊物：大连理工大学学报

期号：1

页面范围：87-92

ISSN号：1000-8608

摘要：The design spectra usually represent the statistical results of some SDOF system subjected to ground motions, but elastic displacement design spectra are not consistent with the elastic-plastic design spectra derived indirectly from the reduction of elastic displacement design spectra by the strength reduction factor spectrum. The discrepancies between above indirect elastic-plastic spectra and statistical spectra are studied based on the statistical analysis of the response of SDOF system subjected to 20 seismic ground motions separately under three kinds of site soil conditions, and it is known that the former might underestimate the earthquake displacement demands especially on soft site or when displacement ductility factor is larger than 4. Then the simplified Vidic's strength reduction factor spectrum with higher accuracy is selected and a modified factor related to the displacement ductility factor, the site condition and the system period is introduced to the indirect elastic-plastic spectra, and the statistical property-consistent elastic-plastic displacement design spectra derived by the reduction of elastic displacement design spectra is proposed finally.

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