Analysis of Terrain Effect on the Properties of Ground Motion Due to Inclined SV Wave
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摘要: 针对10种不同坡角的凸起地形，采用基于透射边界的有限元-有限差分计算方法，研究了局部凸起在SV波斜入射时，地震动峰值加速度放大倍数和反应谱谱比随入射角度的变化规律。结果表明：①地震波以一定的角度斜入射时，地表大部分观测点的峰值加速度放大倍数大于垂直入射的情况；②在计算模型宽高比一定的情况下，最不利入射角度与坡角有一定关系，且地表最不利位置随坡角增大由凸起台地边缘向中心移动；③入射角度对凸起地形地震反应谱特性的影响十分显著，不但影响谱比的幅值，也影响谱比曲线的形状，斜入射时各关键节点大部分周期点的谱比值大于垂直入射，入射角度对反应谱中的高频成分影响较为显著，而对长周期成分影响不大。
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关键词:
- 凸起地形 /
- 斜入射 /
- 地震动特性 /
- 有限元-有限差分计算方法
Abstract: In this paper, we studied the impact of incident angle of seismic wave on the peak ground acceleration (PGA) and response spectrum of ground motion of the topography by the finite element-finite difference calculation method based on the transmission boundary, in which 150 working conditions from 10 terrains were analyzed. The results show that: ① when the seismic wave is obliquely incident at a certain angle, the peak acceleration magnification of most observation points on the surface is basically larger than that of the vertical incident; ② in the case of calculating the aspect ratio of the model, the most unfavorable incidence angle has a certain relationship with the slope angle, and the most unfavorable position of the surface changes with the slope angle from the edge of the raised platform to the center; ③ the influence of the incident angle on the seismic response spectrum of the raised terrain is very significant, which affects not only the amplitude of the spectral ratio, but also the the shape of the spectral curve. The spectral ratio of most of the periodic nodes is larger than that of the vertical incident at the oblique incidence, and the incident angle has a significant effect on the high frequency components in the response spectrum, but not on the long-period component. -
图 2 输入地震动加速度、速度、位移时程曲线
Figure 2. Acceleration, velocity and displacement curves of artificial ground motion samples
图 3 数值解与理论解比较
Figure 3. Comparison of viscous-elastic boundary calculated results with the theoretical solution
图 4 不同入射角度下凸起地表峰值加速度放大倍数
Figure 4. Magnification of peak acceleration of ground surface at different incidence angle
图 5 右顶点时程曲线及反应谱曲线
Figure 5. Time history curve of right vertex and response spectrum curve
图 6 不同观测点反应谱谱比曲线
Figure 6. Curves of response spectrum ratio from different observation points
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