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工程力学  2014 

斜入射SV波对地铁车站地震响应的影响

Keywords: 地震波斜入射,SV波,地下结构,黏弹性人工边界,时域显式有限元

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Abstract:

在显式有限元法结合黏弹性人工边界的时域波动方法的基础上,建立了三维平面SV波斜入射的输入方法。半空间算例说明了该文方法具有较好的精度,并基于所建立的斜入射方法研究了地震波斜入射对北宫门地铁车站地震响应的影响。该算例结果表明:在地震波斜入射情况下,地铁车站的地震响应规律与垂直入射时的情况具有明显差异;斜入射角度对水平加速度响应并不敏感,但对竖向加速度影响较大;斜入射使得车站柱子构件的剪力和轴力明显改变,柱子轴力随着入射角增加而明显增大;边墙控制点的应力状态也受入射角的影响较大,各控制点的第一、第三主应力都出现了随着入射角度增加而增大的规律。在地铁车站等地下结构抗震研究中,应考虑地震波斜入射的影响。

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