A NEW FRAMEWORK FOR RESPONSE SENSITIVITY ANALYSIS OF SOIL-STRUCTURE INTERACTION (SSI) SYSTEMS
This paper presents a newly developed computational framework for response sensitivity analysis of structural and/or geotechnical systems. The framework is developed in the context of finite element (FE) method,and based on the direct differentiation method (DDM). The DDM requires analytically differentiating the FE algorithm for the response computation with respect to material geometry loading parameters,involving the various hierarchical layers of FE response analysis,namely:(1) structure level, (2) element level,(3) Gauss point level (or section level),and (4) material level. The framework is implemented in general purpose FE software,OpenSees,an open system for earthquake engineering simulation,which is widely used for static/dynamic,linear/nonlinear FE analysis of structural/geotechnical systems. Using the newly developed framework,a three dimensional nonlinear frame-soil system subjected to dynamic base excitation is used as application example. The sensitivity parameters are taken as the material parameters used to represent the elastoplastic behavior of the various soil and structural materials. The sensitivity analysis results provide the relative importance of various material parameters on the responses of the SSI system. Furthermore,the propagation of uncertainties is studied through the sensitivities of the local responses at material/element/section level,and global responses at the structural level.
Quan Gu
School of Architecture and Civil Engineering,Xiamen University,Xiamen 361005,P.R.China
国际会议
厦门
英文
1371-1376
2011-10-28（万方平台首次上网日期，不代表论文的发表时间）