Nonlinear Seismic Response Analysis of Sedimentary Valley based on the Coupled FEM-IBIEM

Liu Zhongxian

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Nonlinear Seismic Response Analysis of Sedimentary Valley based on the Coupled FEM-IBIEM

更新时间：2025-09-25

- Nonlinear Seismic Response Analysis of Sedimentary Valley based on the Coupled FEM-IBIEM
- Issue 2, Pages: 287-293(2021)
- 作者机构：
  
  天津城建大学土木工程学院,天津,300384
- 作者简介：
- 基金信息：
- DOI：
  CLC： TU435
- Published：2021
- 稿件说明：
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刘中宪,陈頔,黄磊,张彦.沉积谷地二维非线性地震反应FEM⁃IBIEM耦合分析∗[J].防灾减灾工程学报,2021,(2):287-293

Liu Zhongxian. Nonlinear Seismic Response Analysis of Sedimentary Valley based on the Coupled FEM-IBIEM[J]. 2021, (2): 287-293.
刘中宪,陈頔,黄磊,张彦.沉积谷地二维非线性地震反应FEM⁃IBIEM耦合分析∗[J].防灾减灾工程学报,2021,(2):287-293 DOI：

Liu Zhongxian. Nonlinear Seismic Response Analysis of Sedimentary Valley based on the Coupled FEM-IBIEM[J]. 2021, (2): 287-293. DOI：

摘要

采用有限元?间接边界积分方程耦合方法(FEM-IBIEM)并结合土体等效线性理论，对地震波入射下二维沉积谷地的非线性地震响应进行了模拟分析，得到了半圆形沉积谷地典型观测点的加速度时程曲线及反应谱曲线。结果表明，与线性模型相比，等效线性化模型场地加速度时程幅值有明显下降趋势，部分点位降幅可达 40%；加速度时程在 SV 波垂直入射情况下的降幅普遍大于 30°斜入射时情况；加速度反应谱幅值在高频段下降更为显著，且某些点位加速度反应谱卓越周期有较大增长。

Abstract

The finite element-indirect boundary integral equation coupling method (FEM-IBIEM) combined with the soil equivalent linear theory is used to analyze the nonlinear seismic response of 2-D semi-circular sedimentary valleys under SV wave incidence. The acceleration time history and response spectrum curves at the observation point of the sedimentary valley are obtained. The results show that，compared with that of the linear model，the amplitude of site acceleration time history of the equivalent linear model has a significant downward trend，and the reduction at some points can reach 40%. The amplitude reduction of acceleration time history in the case of SV wave perpendicular incidence is generally greater than that in the case of 30 degree oblique incidence.The acceleration response spectrum decreases more significantly at high frequency，and some predominant period of acceleration response spectrum at some locations increases by a large margin.

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