Efficient analysis scheme for seismic soil-structure interaction with deep soil layer

被引：0
|
作者：
Zhao M. [1 ]
Gao Z.-D. [1 ]
Du X.-L. [1 ]
Wang J.-J. [2 ]
机构：
[1] Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education, Beijing University of Technology, Beijing
[2] College of Civil Engineering, Tongji University, Shanghai
来源：
Gongcheng Lixue/Engineering Mechanics | 2019年 / 36卷 / 10期
关键词：
Artificial boundary condition; Deep soil layer; Seismic input; Seismic soil-structure interaction; Site response;
D O I：
10.6052/j.issn.1000-4750.2018.04.0245
中图分类号：
学科分类号：
摘要：
The direct finite element method is a widely used time history method for seismic soil-structure interaction (SSI) analysis. In this method, the viscous-spring boundary condition is used to model the radiation damping of infinite domain, and the seismic site response is transformed into the equivalent loading. When the soil layer is extraordinary thick, the computational efficiency of seismic SSI analysis especially for three-dimensional problem is very low due to the finite element model of the whole deep soil layer. In this paper, an efficient analysis scheme is developed. In which, the one-dimensional site response analysis is still performed for the whole deep soil layer, and subsequently the bottom artificial boundary of SSI model is moved up from the actual soil layer bottom (bedrock surface) to the location sufficiently near the structure. The theoretical analyses and numerical examples are presented to indicate the accuracy and efficiency of the proposed efficient analysis scheme. The different boundary treatments and seismic inputs at different locations of the moved bottom boundary are compared with the finite element model of the whole deep soil layer. The proposed scheme meets the precision requirements, and some suggestions on artificial boundary treatment and location are given. © 2019, Engineering Mechanics Press. All right reserved.
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页码：58 / 65
页数：7
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