(1. School of Civil Engineering，Southwest Jiaotong University，Chengdu，Sichuan 610031，China；2. China Nuclear Industry Geotechnical Engineering Co.，Ltd.，Zhengzhou，Henan 450000，China)
Abstract：This article studies the impact of incident angle of seismic waves on the ground motion responses of basin by using two-dimensional nonlinear seismic response analysis program and Ricker wave(as incident SH wave) with different incident angles，PGAs and predominant frequencies. Research results are shown as follows：The maximum amplification ratio of the PGAs is not the one from vertically incident seismic waves，roughly between 5°～25°which suggests that the results may be conservative if only vertically incident angle of seismic waves is considered in seismic safety evaluation；meanwhile，a downward trend is observed in the peak value of response spectra with the increase of the incident angle；furthermore，the rise of predominant frequency of incident seismic waves shrinks the range of incident angle that has an effect on PGA；moreover，slope angle has an significant influence on the distribution pattern of PGA along the basin surface，with the growth of slope angle，the strongest response position shifts gradually from the edge to the center of basin.
CUBRINOVSKI M，GREEN R A. Geotechnical reconnaissance of the 2010 Darfield(New Zealand) earthquake[R]. New Zealand：the National Science Foundation-Sponsored Geotechnical Extreme Events Reconnaissance (GEER) Team，2010：180.
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2014, Vol. 33 
