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SPH-FEM coupled simulation of SSI for conducting seismic analysis on a rectangular underground structure

机译：SSI对矩形地下结构进行地震分析的SPH-FEM耦合模拟

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摘要

A reliable simulation of soil-structure interaction (SSI) is the precondition for understanding properly the dynamic response characteristics and earthquake disaster mechanism of underground structures. This paper adopts Smoothed Particle Hydrodynamics-Finite Element Method (SPH-FEM) coupled method to address the SSI issue. The coupled method takes advantage of the convenience of SPH in simulating the particle features of soils. The advantages of the presented method are capable of tracking the location information and motion of soils at any moment, and the deformation process inside the near-structure soils can also be captured during an earthquake. Meanwhile, it can also be made use of the accuracy of FEM in handling boundary issues and solving structural dynamics. Analysis results indicate that not only the racking deformation mode is observed, but also a rocking vibration mode that is non-negligible can be found for a rectangular underground structure under transverse seismic excitation. The rocking vibration mode is shown as the incline of top and bottom slabs, which is caused by the asymmetric seismic action on two opposite side-walls resulting from the different soil-structure contact status. The analysis clearly shows that the seismic earth pressure is a result of the interaction between soil and structure in an earthquake. The distribution and magnitude of seismic earth pressure are influenced by the magnitude of soil deformation and soil-structure contact status.
机译：可靠的土壤结构相互作用模拟（SSI）是理解的前提是，正常结构的动态响应特征和地震灾害机制。本文采用平滑的粒子流体动力学 - 有限元方法（SPH-FEM）耦合方法来解决SSI问题。耦合方法利用SPH模拟土壤颗粒特征的便利性。所提出的方法的优点能够在任何时刻跟踪土壤的位置信息和运动，并且在地震期间也可以捕获近结构土壤内的变形过程。同时，它还可以利用有限元处理边界问题和解决结构动态的精度。分析结果表明，不仅观察到串行变形模式，而且还可以在横向地震激发下找到不可忽略不可忽略的摇摆振动模式。摇摆振动模式显示为顶板和底板的倾斜，这是由不同土壤结构接触状态产生的两个相对的侧壁上的不对称地震作用引起的。该分析清楚地表明，地震地球压力是地震中土壤和结构之间相互作用的结果。地震土压力的分布和幅度受土壤变形和土壤结构接触状态的影响。

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