计算力学学报Issue(4)：465-472,8.DOI:10.7511/jslx201504004
基于数值子结构方法的结构弹塑性分析
Numerical substructure method for structural nonlinear analysis
摘要
Abstract
According to seismic damage analysis of structures,the whole structure might fail due to the serious damages of some key structural members.In spite of this,it was observed that most structural members might keep elastic and experience small deformation during the process.Thus it is unnecessary to use nonlinear models for the whole structures during the entire process of seismic analysis.A novel modeling methodology,named numerical substructure method,was presented considering the demands of computational efficiency and accuracy,including dynamic replacement substructure method and isolation substructure method.In the first method,once the elastic structural members (e.g.steel members and reinforced concrete members)yielded,they were replaced in the element and section levels by nonlinear models.In the isolation substructure method,the key members were isolated from the master structure, and refined FE models for the members were built in other platforms.The data transfer (e.g.displace-ment,force and tangent stiffness)between master structure and substructure was achieved by using CS technique.The above numerical substructure methods were implemented into a general finite element framework,OpenSees.To verify the newly developed numerical substructure method,two steel frames and a RC frame subj ected to both static and dynamic loading conditions were taken as application exam-ples.The analysis results using dynamic replacement elements model agree well with that using normal fiber elements model,while the computational time greatly reduced,although this advantages become less remarkable with increasing number of members yielded and replaced;the data transfer between master structure and substructures are efficient and accurate,enabling isolation substructure method to be potentially used in large scale structural elastic-plastic analysis.关键词
数值子结构/弹塑性/计算效率/纤维模型/OpenSeesKey words
numerical substructure/elastic-plastic/computational efficiency/fiber model/OpenSees分类
信息技术与安全科学引用本文复制引用
孙宝印,张沛洲,古泉,欧进萍..基于数值子结构方法的结构弹塑性分析[J].计算力学学报,2015,(4):465-472,8.基金项目
国家自然科学基金(51261120376,91315301-12)资助项目 （51261120376,91315301-12）
