论文部分内容阅读
自复位防屈曲支撑构件在拟静力试验中表现出良好的复位性能及耗能能力。但是,自复位防屈曲支撑钢框架中支撑与主体结构的刚度关系,以及结构中的复位系统与耗能系统的关系如何合理设置,都需要借助结构试验或参数分析来解决。根据我国现行规范设计了钢框架结构,在构件试验研究及理论分析基础上给出了自复位防屈曲支撑钢框架结构的三线性恢复力模型,并用有限元软件ANSYS建立结构模型。根据此模型对防屈曲支撑钢框架和自复位防屈曲支撑钢框架结构进行了抗震性能对比。通过自复位防屈曲支撑动力位移反应分析,研究了支撑与结构刚度比αB/M,结构耗能系统与复位系统的屈服力比β及其刚度比αc三个重要参数。结果表明:自复位防屈曲支撑钢框架结构最大位移及残余位移角均小于防屈曲支撑钢框架结构的。结构刚度比αB/M越大越有利于减少残余变形;屈服力比β越大结构位移响应越小;刚度比αc越大结构位移响应越小。在初始设计时,建议钢框架结构的αB/M取为3;β取0.5~0.9;αc取为0.5。
Self-resetting buckling brace members show good reset performance and energy dissipation capability in quasi-static tests. However, the relationship between the stiffness of the support and the main structure in self-resetting buckling-supported steel frame and how to properly set the relationship between the reset system and the energy-dissipating system in the structure need to be solved by structural test or parameter analysis. According to the current code in our country, the steel frame structure is designed. Based on the component experimental research and theoretical analysis, a trilinear restoring force model of the steel frame structure with self-resetting buckling brace is given. The structural model is established by the finite element software ANSYS. According to this model, the anti-seismic performance of anti-buckling brace steel frame and self-restoring buckling brace steel frame structure are compared. Through the analysis of dynamic displacement response of self-reset buckling support, three important parameters of yield-strength ratio β and stiffness ratio αc between the structure-stiffness ratio αB / M and the structural energy-dissipating system and the reset system are studied. The results show that the maximum displacement and residual displacement angle of self-restoring buckling-supported steel frame are all less than that of buckling-supported steel frame structure. The larger the structural stiffness ratio αB / M is, the more it is in favor of reducing the residual deformation. The larger the yield strength ratio β is, the smaller the structural displacement response is. The greater the stiffness ratio αc is, the smaller the structural displacement response is. At initial design, it is recommended that αB / M of the steel frame structure be taken as 3; β be taken as 0.5 to 0.9; and αc be taken as 0.5.