深厚软土场地中三维凹陷地形非线性地震响应分析

梁建文; 梁佳利; 张季; 巴振宁

doi:10.11779/CJGE201707005

深厚软土场地中三维凹陷地形非线性地震响应分析 English Version

梁建文^{1, 2},
梁佳利²,
张季²,
巴振宁²

1. 天津大学水利工程仿真与安全国家重点实验室,天津 300354;
2. 天津大学建筑工程学院土木工程系,天津 300354

基金项目: 国家自然科学基金项目（51578372）

详细信息

作者简介:
梁建文(1965- ),男,教授,博士生导师,主要从事地震工程的研究。E-mail: liang@tju.edu.cn。

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出版历程
- 收稿日期: 2016-04-10
- 发布日期: 2017-07-24

Nonlinear seismic response of 3D canyon in deep soft soils

1. State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300354, China;
2. School of Civil Engineering, Tianjin University, Tianjin 300354, China

摘要

摘要: 采用黏弹性人工边界并结合地震动输入等效结点力法实现半无限场地的波动输入,采用等效线性法模拟土体的非线性特征,基于有限元软件ABAQUS,建立弹性基岩上覆深厚软土中三维凹陷地形非线性地震响应分析模型。通过与文献比较,验证了整体模型的精度。以天津地区某一浅椭球凹陷地形为例进行数值计算,比较了非线性地震响应与线性地震响应的差别,并进一步分析了三维凹陷地形对非线性地震响应造成的影响,最后计算了在地震安全性评价人工波作用下三维凹陷地形的非线性地震响应。研究表明,土体的非线性特征对三维凹陷地形地震响应有显著影响。研究还发现一个特殊现象,即凹陷地形中心附近的非线性地震响应可能会大于其线性地震响应,且地震激励幅值越大,这一现象越明显。对于三维复杂局部场地的非线性地震响应研究,模型具有一定的参考价值。
- 三维凹陷地形 /
- 地震响应 /
- 黏弹性边界 /
- 等效结点力 /
- 等效线性
Abstract: A model is proposed for nonlinear seismic response of 3D canyon in deep soft soils. In the model, the viscous-elastic boundary and the equivalent node force input method are combined for wave motion input, and the equivalent linear method is introduced for nonlinear soil behavior. The model is based on the general finite element software ABAQUS. The accuracy of the model is verified by comparing with the results in the existing literatures. Nonlinear seismic response of a 3D shallow canyon in deep soft soils is performed and compared with the linear response, and the influence of canyon on nonlinear seismic response is analyzed. Finally, the nonlinear response of the 3D shallow canyon under excitation of the artificial wave from seismic safety evaluation is presented. It is shown that the nonlinear behavior of soils has significant effect on the seismic response of the 3D canyon. The nonlinear seismic response can be greater than the linear response near the canyon center, as a result of wave scattering by the 3D canyon, and it is more obvious for a larger seismic excitation. The proposed model is valuable for analyzing the nonlinear seismic effect of complex local sites.
- 3D canyon /
- seismic response /
- viscous-elastic boundary /
- equivalent node force /
- equivalent linearity

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参考文献(17)

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