端板连接半刚性节点对多层钢框架设计的影响

我国目前将端板连接按刚性节点进行设计,主要用在单层门式刚架结构中,对多层钢框架由于缺乏计算理论和方法,与实际情况相差很大,特别是对抗震性能的影响很大.针对端板连接节点,采用有限元分析的方法,利用试验和有限元计算得到的节点刚度转角曲线,将半刚性端板连接节点视为弹簧单元,通过通用有限元软件Ansys建立有限元模型进行计算分析.对比了将端板连接视为刚性和半刚性两种情况下钢框架的内力和变形,在钢框架分析和设计中,应考虑半刚性节点的影响.并给出一些在设计时考虑节点刚度的建议,希望能够对实际工程设计有所助益.

An Analysis of the Design of Multistory Steel Frames with Semirigid End-Plate Connections

Because of the absence of the calculation theory and design method for the semirig- id end-plate connection which is wildly used in portal frames, which leads to the significant difference between the calculation result and the real stressed state of the end-plate connection, especially for multi-story frame. Using the initial connection stiffness and the momentrotation （M-Ф） curve, obtained from both experiments and finite element methods,and taking the semirigid end-plate connection as a spring element, a FEM model is set up by Ansys to calculate and analyze, and the influence of semirigid connections on the multistory steel frames design is studied in this paper. The result shows that the steel frames with semirigid connections are different from those ,ruth rigid connections. The flexibility of the connections affects the behavior of the frames and their influences can not be ignored in the steel frames design and analysis.