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基于显式有限元方法和人工透射边界,对二维河谷地形在3条地震动波以SV波形式垂直入射和30°斜入射下进行了地震反应分析,比较了河谷地表各观测点地震动的差别,探讨了河谷地形地震动空间分布特征。结果表明,河谷地形对地震动分布具有重要影响,沿河谷斜坡顶到谷底的各观测点地震动峰值加速度(PGA)存在显著差异,地震动位移存在差动现象,地震动加速度反应谱在大于1 Hz的高频段差别明显。入射角度是影响场地地震反应的重要因素,斜入射时各观测点PGA和相对位移的离散程度明显大于垂直入射情形。
Based on the explicit finite element method and the artificial transmission boundary, the seismic responses of three seismic waves to two-dimensional river valleys under the vertical incidence of SV wave and the incident angle of 30 ° are analyzed. The ground motion of each observation point on the river valley The paper discusses the spatial distribution of terrain and ground motions in the valley. The results show that the river valley topography has an important influence on the ground motion distribution. The peak ground acceleration (PGA) at each observation point along the valley from top to bottom of the valley shows significant difference, and the ground motion displacement has a differential phenomenon. The ground motion acceleration response spectrum is larger than 1 Hz high frequency difference is obvious. The angle of incidence is an important factor affecting the seismic response of the site. The dispersion of PGA and relative displacement at each observation point is obviously larger than that of the vertical incidence at oblique incidence.