分析土和结构相互作用的一种实用耦合方法

A Practical Coupling Method for Analyzing Soil-structure Interaction

提出一种新的数值解与解析解耦合的理论和计算方法,研究土-结构相互作用(SSI)体系的地震动力响应。采用大型有限元软件OpenSees模拟复杂结构的非线性行为,用等效线弹性频域内解析解模拟地基土的行为,使用时域离散递归方法将频域内的解析解转化到时域内,再通过子结构边界上力和位移的协调条件来求解。二者之间的耦合和实时数据交流通过CS集成方法来实现。以一个单自由度算例和一个实际工程为例,验证此方法的精度、稳定性和工程实用性,对比在考虑和不考虑SSI体系情况下结构动力响应的区别。本文所提的耦合SSI计算方法和部分研究成果可为工程设计人员提供参考。

A novel practical method is presented for the analysis of soil-structure interaction（SSI）.In this method,the structure is modeled by nonlinear FEM（OpenSees）,and the soil is modeled by a time domain solution that is transformed from a frequency domain analytical solution using a discrete time domain recursive filter.The boundary conditions of force and displacement between soil and structure are satisfied using Newton＇s method,and the coupling between the two substructures is based on CS integration techniques.We use structure and soil systems with a single degree of freedom,and study a real SSI example to determine the efficiency,accuracy,and applicability of the proposed method.Furthermore,we examine the differences between the conditions when considering and not considering SSI effects.This study proposes a practical method for nonlinear seismic analysis of SSI systems,and the research results provide valuable insights for engineering applications.