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对钢框架H形梁柱节点承受梁端不平衡弯矩时的节点域弹性刚度进行研究。考察了节点域的变形组成,在合理假定基础上,经理论推导得到只考虑纯剪切作用的弹性刚度上限值,以及同时考虑双向弯曲影响的弹性刚度修正计算公式。基于经试验校准的有限元模型,进行了不同几何尺寸的梁柱节点参数分析,并以数值拟合得到在一定程度上修正理论推导时各类假定所导致误差的修正公式。经与试验及有限元弹性刚度值的比较,显示该文提出的两个修正公式能更准确地计算节点域弹性刚度。
The elastic stiffness of the joint at the moment when the H-beam-column joint of steel frame is subjected to the unbalance moment at the beam end is studied. On the basis of reasonable assumption, the upper bound of elastic stiffness considering only pure shear is deduced theoretically, and the formula of elastic stiffness correction considering both directions of bending is derived. Based on the experimental calibration of the finite element model, the parameters of beam-column joints with different geometrical dimensions were analyzed, and the correction formula of the error caused by various assumptions was obtained by numerical fitting to a certain extent. Comparing with experiment and finite element elastic stiffness, it is shown that the two correction formulas proposed in this paper can calculate the elastic stiffness of node more accurately.