端板连接耗能梁段偏心支撑钢框架滞回性能研究

摘要

The nonlinear finite element analysis for the behavior of eccentrically braced steel frames with end-plate connected link is carried on by finite element software ANSYS,using compositional modeling of beam elements and solid elements,defining node-to-surface contact and using MPC calculation can realize the two elements correct connections. Through simulating the test frame,it is found that the simulation curve and the test curve have a good agreement with each other. Based on the research results in combination with the country design codes,in consideration of the blot′s diameter and the end-plate′s thickness that influenced the structure performance,eight eccentrically braced steel frames with end-plate connected link are designed and set up. Analysis results show that:Eccentrically braced steel frames with end-plate connected link have great ductility and stable hysteretic behavior. The smaller bolt′s diameter lead the failure to occur in the con-nection area earlier than in the link. Connection design by the codes meets the requirement of the connec-tions. Too thin end-plate will lead a large deformation on end-plate,the connection will be a failure. The end-plate thickness of the link should not be less than the blot′s diameter.%应用ANSYS软件对端板连接耗能梁段偏心支撑钢框架进行非线性有限元分析。采用梁单元和实体单元联合建模，定义点-面接触并使用MPC算法实现梁单元和实体单元的连接。对已有试验试件进行模拟，计算结果与试验结果吻合较好。根据相关研究成果，结合我国现行设计规范，考虑高强螺栓直径及连接端板厚度等参数的影响，设计了8个端板连接耗能梁段偏心支撑钢框架结构模型。有限元分析表明：端板连接耗能梁段偏心支撑钢框架具有良好的延性和耗能能力；螺栓直径过小会导致连接的破坏先于耗能梁段，按照规范设计的连接满足结构受力要求；耗能梁段端板太薄会造成端板变形过大，导致连接节点破坏，建议厚度取值不应小于连接螺栓的直径。