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Efficient seismic analysis for nonlinear soil-structure interaction with a thick soil layer
Earthquake Engineering and Engineering Vibration ( IF 2.8 ) Pub Date : 2021-07-16 , DOI: 10.1007/s11803-021-2038-3
Gao Zhidong 1 , Zhao Xu 1 , Zhao Mi 1 , Du Xiuli 1 , Liu Pengcheng 1 , Wang Junjie 2
Affiliation  

The direct finite element method is a type commonly used for nonlinear seismic soil-structure interaction (SSI) analysis. This method introduces a truncated boundary referred to as an artificial boundary meant to divide the soil-structure system into finite and infinite domains. An artificial boundary condition is used on a truncated boundary to achieve seismic input and simulate the wave radiation effect of infinite domain. When the soil layer is particularly thick, especially for a three-dimensional problem, the computational efficiency of seismic SSI analysis is very low due to the large size of the finite element model, which contains an whole thick soil layer. In this paper, an accurate and efficient scheme is developed to solve the nonlinear seismic SSI problem regarding thick soil layers. The process consists of nonlinear site response and SSI analysis. The nonlinear site response analysis is still performed for the whole thick soil layer. The artificial boundary at the bottom of the SSI analysis model is subsequently relocated upward from the bottom of the soil layer (bedrock surface) to the location nearest to the structure as possible. Finally, three types of typical sites and underground structures are adopted with seismic SSI analysis to evaluate the accuracy and efficiency of the proposed efficient analysis scheme.



中文翻译:

厚土层非线性土-结构相互作用的有效地震分析

直接有限元法是一种常用于非线性地震土-结构相互作用 (SSI) 分析的方法。该方法引入了被称为人工边界的截断边界,旨在将土壤结构系统划分为有限域和无限域。在截断的边界上使用人工边界条件来实现地震输入并模拟无限域的波辐射效应。当土层特别厚时,特别是对于三维问题,由于有限元模型体积大,包含整个厚土层,地震SSI分析的计算效率非常低。在本文中,开发了一种准确有效的方案来解决关于厚土层的非线性地震 SSI 问题。该过程包括非线性现场响应和 SSI 分析。仍然对整个厚土层进行非线性场地响应分析。SSI 分析模型底部的人工边界随后从土层底部(基岩表面)向上重新定位到尽可能靠近结构的位置。最后,采用三类典型场地和地下结构进行地震SSI分析,以评估所提出的高效分析方案的准确性和效率。

更新日期:2021-07-16
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