三维局部场地对地震波的散射IBIEM-FEM耦合模拟

刘中宪; 黄磊; 梁建文

doi:10.11779/CJGE201702014

三维局部场地对地震波的散射IBIEM-FEM耦合模拟 English Version

1. 天津城建大学天津市土木建筑结构防护与加固重点实验室,天津 300384;
2. 天津大学土木工程系,天津 300072

基金项目: 国家自然科学基金项目（51278327）; 天津市应用基础与前沿研究计划项目（14JCYBJC21900,13JCZDJC35500）

详细信息

作者简介:
刘中宪(1982- ),男,教授,主要从事地震工程和工程波动领域的教学和科研。E-mail：zhongxian1212@163.com。

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出版历程
- 收稿日期: 2015-11-26
- 发布日期: 2017-03-24

FEM -IBIEM coupled method for simulating scattering of seismic waves by 3-D complex local site

1. Tianjin Key Laboratory of Civil Structure Protection and Reinforcement, Tianjin Chengjian University, Tianjin 300384, China;
2. Department of Civil Engineering, Tianjin University, Tianjin 300072, China

摘要

摘要: 针对任意三维复杂局部场地对地震波的散射问题,发展了一种有限元-间接边界积分方程耦合方法(FEM-IBIEM)。其中IBIEM利用层状半空间集中荷载动力格林函数,可精确实现半无限层状介质中波的辐射条件,同时可大幅度降低计算内存;FEM可方便处理近地表复杂场地的几何、材料特征。在精度检验基础上,以三维沉积盆地和山体对地震波的散射为例,展示了方法对复杂局部场地反应问题的适应性,同时针对三维盆地效应和山体震动得出了一些有益结论。计算方法可应用于层状无限域中任意不均质体对弹性波的散射求解。
- 有限元 /
- 间接边界积分方程法 /
- 耦合方法 /
- 地震波散射
Abstract: A hybrid technique, FEM-IBIEM is developed for studying the scattering of seismic waves by a 3-D complex local site. The indirect boundary integral equation method (IBIEM) adopts the dynamic Green's functions of concentrated loads for a layered half-space. It can accurately satisfy the radiation condition of waves in semi-infinite layered media and greatly reduce the computational memory. For the local site with complex materials and geometric features, FEM is more convenient. Based on accuracy tests and taking the seismic wave scattering resulting from 3-D sedimentary basins and mountains as the example, the adaptability of the proposed method for the seismic response in the complex local site is conformed, and several beneficial conclusions about the 3-D sedimentary basin effects and mountain vibration are drawn. This method can be used for studying the scattering of elastic waves by arbitrary inhomogeneous site in layered half-space.
- finite element method /
- indirect boundary integral equation method /
- coupled method /
- seismic wave scattering

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参考文献(25)

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