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钢框架梁柱弱轴连接节点的力学性能具有明显的半刚性连接特性。基于小变形叠加原理,将梁柱弱轴连接节点的转角变形分解为弯矩作用引起的节点转角和节点域剪切变形引起的转角。采用虚功原理推导了梁柱弱轴连接节点在弯矩作用下的节点转角计算公式。同时,采用弹性力学方法推导了该类节点的节点域剪切变形引起的转角计算公式。通过节点的弯矩-转角关系,求得该类节点的转动刚度,并提出适合于结构分析的节点力学分析模型。算例结果表明,梁柱弱轴连接节点的半刚性大大降低了结构的抗侧刚度,在实际工程设计中不容忽视。
The mechanical properties of steel frame beam-axis joints have obvious semi-rigid connection characteristics. Based on the principle of small deformation and superposition, the deformation of the corner joint of the beam-column weak axis is decomposed into the corner caused by the bending moment and the corner caused by the shear deformation of the node field. Based on the principle of virtual work, the formula of node rotation of beam-column joints with weak axis under bending moment is deduced. At the same time, the formula of the corner caused by the shear deformation of the nodes in this kind of node is deduced by the method of elasticity mechanics. According to the moment-moment relationship of the joints, the rotational stiffness of the joints is obtained, and the joint mechanics analysis model suitable for structural analysis is proposed. The results of numerical examples show that the semi-rigid connection of the weak axis of beam-column greatly reduces the lateral stiffness of the structure, which can not be neglected in the actual engineering design.