The boundary conditions for simulations of a shake-table experiment on the seismic response of 3D slope

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• 作者：Liang Tang ; Shengyi Cong ; Xianzhang Ling…
• 关键词：boundary condition ; dynamic response ; soil slope ; nonlinear finite element analysis ; shake ; table experiment ; earthquake
• 刊名：Earthquake Engineering and Engineering Vibration
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：16
• 期：1
• 页码：23-32
• 全文大小：
• 刊物类别：Engineering
• 刊物主题：Geotechnical Engineering & Applied Earth Sciences; Civil Engineering; Vibration, Dynamical Systems, Control;
• 出版者：Institute of Engineering Mechanics, China Earthquake Administration
• ISSN：1993-503X
• 卷排序：16

文摘

Boundary conditions can significantly affect a slope’s behavior under strong earthquakes. To evaluate the importance of boundary conditions for finite element (FE) simulations of a shake-table experiment on the slope response, a validated three-dimensional (3D) nonlinear FE model is presented, and the numerical and experimental results are compared. For that purpose, the robust graphical user-interface “SlopeSAR”, based on the open-source computational platform OpenSees, is employed, which simplifies the effort-intensive pre- and post-processing phases. The mesh resolution effect is also addressed. A parametric study is performed to evaluate the influence of boundary conditions on the FE model involving the boundary extent and three types of boundary conditions at the end faces. Generally, variations in the boundary extent produce inconsistent slope deformations. For the two end faces, fixing the y-direction displacement is not appropriate to simulate the shake-table experiment, in which the end walls are rigid and rough. In addition, the influence of the length of the 3D slope’s top face and the width of the slope play an important role in the difference between two types of boundary conditions at the end faces (fixing the y-direction displacement and fixing the (y, z) direction displacement). Overall, this study highlights that the assessment of a comparison between a simulation and an experimental result should be performed with due consideration to the effect of the boundary conditions.