点击次数：

论文类型：期刊论文

发表时间：2021-01-11

发表刊物：SOIL DYNAMICS AND EARTHQUAKE ENGINEERING

卷号：44

页面范围：139-152

ISSN号：0267-7261

关键字：Soil-structure interaction; Damping Solvent Stepwise Extraction method; Time domain analysis; ANSYS; Interface-Coupling element

摘要：A three-dimensional Damping Solvent Stepwise Extraction (DSSE) method is developed and implemented in the ANSYS finite element software for nonlinear seismic analysis of large-scale structures resting on an unbounded visco-elastic soil. Given a larger introduced artificial damping and arbitrary soil-structure interface geometry, the DSSE method provides a more efficient and accurate way to calculate the interaction forces of the unbounded soil within the framework of finite elements. In order to consider the effect of the artificial damping on structures, an Interface-Coupling element established with interface nodes in generalized structure substructure is developed through the element-based partition of the damped soil elements. The Newton-Raphson iteration method is employed along with the Newmark assumptions for the nonlinear analysis of generalized structures. The Newmark algorithm for damped bounded soil is also employed to assure the accuracy and convergence of the interaction system. User Programmable Features (UPFs) available in ANSYS is used to incorporate DSSE method. Also, a complete toolkit for general seismic soil-structure interaction (SSI) analysis is created using scripting-based ANSYS Parametric Design Language (APDL) and Graphical User Interface (GUI). The proposed technique is applicable to arbitrary sophisticated structure models, irregular soil domain, and provides the selection of the artificial damping without depending on the domain size of bounded soil. Two validation examples are presented to demonstrate the accuracy and efficiency of the proposed method. Moreover, an optimal case is suggested in view of engineering practice based on the comparison among the results from several sets of computational parameters including domain size, amount of artificial damping, and extraction steps. Nonlinear seismic analysis of high arch dam in south-west China is also presented to illustrate the analysis procedure, and demonstrate the capabilities of the method. (C) 2012 Elsevier Ltd. All rights reserved.