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从分散焊缝的角度出发,提出一种新型冷弯薄壁钢管结构梁柱焊接方式。在已有试验基础上,通过有限元分析,研究了该节点极限承载能力、耗能能力及节点域的应力分布状态。结果表明:有限元结果与试验结果比较吻合,平均误差约为4.82%;轴压比对该节点的极限承载能力影响较小,但对延性及耗能能力影响大;C形钢梁下翼缘处于较高的三向复杂应力状态,在往复荷载作用下容易首先发生破坏,在设计时需引起注意;节点的破坏模式为C形钢梁平面外鼓曲、C形钢梁下翼缘焊接处开裂,节点域形成明显的塑性区域,属于延性破坏。
From the perspective of dispersive weld, a new type of cold-formed thin-wall steel pipe beam-column welding method is proposed. Based on the existing experiments, the ultimate bearing capacity, energy dissipation capacity and stress distribution of the joint are studied by finite element analysis. The results show that the finite element results are in good agreement with the experimental results, and the average error is about 4.82%. The axial compression ratio has little effect on the ultimate bearing capacity of the joint, but has great influence on the ductility and energy dissipation capacity. In the high three-way complex stress state, under the action of reciprocating load, it is easy to be destroyed first, which needs attention in design. The failure mode of the joint is the out-of-plane drum curve of C-shaped steel beam, Cracking, the formation of the node domain obvious plastic region, belonging to ductile damage.