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中文摘要：
高坝地震反应分析通常假定地震波垂直入射,在显式有限元法结合黏弹性人工边界的时域波动分析方法的基础上,建立了三维平面地震波倾斜入射的输入方法。采用所建立的斜入射输入方法,研究了地震波斜入射对小湾拱坝地震反应的影响。分析结果表明：与垂直入射相比,地震波倾斜入射可能显著增加对拱坝抗震安全性起控制作用部位位移、速度、加速度反应的频谱幅值放大系数,应该在拱坝地震反应分析中考虑地震波斜入射的影响。
英文摘要：
In seismic response analysis of high dam,the incidence of plane seismic waves is usually considered as vertical.To improve this assumption,an input method of oblique plane seismic waves for three-dimensional calculation is proposed in the frame of time-domain wave method that couples explicit finite-element method with viscous-spring artificial boundary condition.The new method was applied to the Xiaowan arch dam,and the effect of incidence angle was examined.The results show that in comparison with vertical incidence,oblique incidence of seismic waves may cause significant increases in the amplitude amplification factors of displacement,velocity and acceleration at key locations of the arch dam.Thus this study suggests that oblique incidence should be accounted in the response analysis.
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