半刚性连接钢框架的塑性铰法分析

在众多的钢框架连接模型中,基于较适合结构分析的3参数力学模型,模拟了半刚性连接梁柱节点的弯矩—转角性能.从有限变形理论和虚功原理出发,详细地推导了半刚接梁单元在集中荷载作用下固端弯矩的计算公式与总刚度方程.在此基础上,考虑了半刚接钢框架的几何非线性和连接柔性的影响,利用杆件有限元方法进行实例验证,对刚接框架与半刚接框架的内力进行对比分析,结果表明计算方法可靠,对工程设计具有一定的参考价值.

Plastic Hinge Analysis of Steel Frame with Semi-rigid Connections

The moment-rotation relation of beam-to-column semi-rigid connections was simulated with a three-parameter mechanical model which was selected from many mechanical models. The calculation formulas of the fixed end moments, the total stiffness matrix equation and the transmission coefficient of beam elements with semi-rigid connections were presented on the basis of the superposition principle under large displacement,small deformation and the principle of virtual work. Based on these theories, we took into account the effects of the connections and the geometric nonlinearity of the members. By the method of finite element analysis, we analyzed in a comparative way the internal forces of the rigid frame and the semi-rigid frame. The results showed that the proposed methods were reliable and helpful for the engineering personnels.