(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.
兰景岩，吕跃军，刘红帅. 地震动强度及频谱特征对场地地震反应分析结果的影响[J]. 震灾防御技术，2012，7(1)：37-45.(LAN Jingyan，LU Yuejun，LIU Hongshuai. Effect of ground motion intensity and spectral characteristics on site seismic response[J]. Technology for Earthquake Disaster Prevention，2012，7(1)：37-45.(in Chinese))
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2014, Vol. 33 
