半刚性端板连接多层钢框架的Push-over分析

Push-over Analysis of Multistory Steel Frame with Semirigid End-plate Conections

由于缺乏计算理论和方法,大多数半刚性节点按刚性节点进行设计,对结构的静力分析、抗震性能等各方面的设计计算的影响很大.本文采用有限元分析方法,将半刚性连接节点视为弹簧单元,通过通用有限元软件Sap2000对一个半刚性端板连接的多层钢框架建立有限元模型并进行了模态分析、反应谱分析和Push-over(静力弹塑性)分析.结果表明,采用了半刚性端板连接的钢框架结构,相对于理想刚接的情况,结构在多遇和罕遇地震作用下结构的抗震性能明显变化.

Because of the absence of calculation theory and design method for semirigid connection, it is still calculated and designed as rigid connection in our country, which leads to significant differences between the calculation result and the real stressed state. In this paper, an FEM model of a multistory steel frame with semirigid end-plate connections was set up with Sap2000, and modal analysis, spectrum analysis and pushover analysis on the model were calculated. The dynamic properties of the steel frame with semirigid end-plate connections were discussed, and the influence of semirigid connections on the multistory steel frames design was studied. The results have shown that the steel frames with semirigid connections are different from that with rigid connections. The flexibility of the connections affects the behavior of the frames, and their influences can not be ignored in the design and analysis of steel frames.