钢框架带悬臂梁段拼接节点的承载特性分析

Bearing Capacity Analysis of Steel Frame Joints with Cantilever Beam Splicing

通过有限元计算研究钢框架带悬臂梁段等强拼接节点与可滑移拼接节点的承载特性,得到两者的弯矩-转角曲线和变形、破坏形态,分析不同拼接强度对节点承载性能的影响。经过分析发现虽然可滑移拼接节点的梁翼缘腹板拼接均有所削弱,但其极限承载力并未降低,且转动能力比等强拼接节点提高34.8%;进一步对可滑移拼接节点的变形进行分析,发现滑移能显著提高节点的塑性转角,并给出滑移对转角贡献的公式,与有限元计算结果吻合较好。在对比分析的基础上,给出钢框架带悬臂梁段拼接节点的"强焊弱栓"设计建议,供设计参考。

The bearing capacity of steel frame joints with equal strength beam splicing and slippage allowable splicing is studied respectively by using finite element method. The moment rotation curves, deformation and failure modes of two such joints are obtained, and the influence of different splicing strength on the joint bearing capacity is analyzed. The results show that the ultimate bearing capacity of the slippage allowable joint does not decrease and the rotation capacity is 34.8 percent larger than that of the equal strength splice joint, though the beam flang and web splicing are weakened. Further analysis on the deformation of the slippage joint demonstrates that the slippage markedly increases the plastic rotation of the joint. Expression to determine the contribution of the slippage on the rotation is suggested, which matches well with the finite element results. On the basis of this study presented, ＂strong-weld-weak-bolt＂ design suggestions on steel frame joints with cantilever beam splicing are proposed for design reference.