巨型钢框架节点基于性能的研究

Research on performance-based design of steel mega-frame joints

基于性能的设计方法是当前结构设计的发展趋势,在基于性能的结构设计方法中,节点的行为参数确认与性能评估是重要的组成部分,而节点的相关判断准则不能脱离结构而存在.巨型钢框架节点受力较复杂,为了得到基于整体结构的巨型钢框架节点的性能指标:①建立了巨型钢框架有限元分析模型,选择了6个具有代表性的节点,采用ANSYS中的实体单元SOLID45建模,其余杆件采用梁单元BEAM188建模;②对整体结构采用位移加载的方式,以巨型钢框架结构的位移性能为控制指标,分析巨型钢框架节点在不同位移性能指标下的力学性能,从而建立了基于整体结构的巨型钢框架节点的性能指标.

Structural design based on performance is the development tendency.The validation of behavior parameter and evaluation of performance of joints are the important composition of performance-based design.The concept of performance-based joint design by considering global structures was accepted in this paper.In order to get the performance index of mega-frame joints,the finite element model of steel mega frame was set up and analyzed by software ANSYS.Six typical mega-frame joints in the global structure were chosen to be studied and modeled by using SOLID45 element,other members were modeled by using BEAM188 element.The mega frame structure was loaded through displacement on top floor.The mechanical behaviors of mega-frame joints under different structural displacement performance index were investigated.Consequently,the performance index of mega-frame joints based on global structure was obtained.