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国外震后研究发现,组合节点破坏的主要原因是混凝土楼板对节点刚度和承载力的影响被忽略。本文在2种类型4个梁柱组合节点研究和理论分析的基础上,评估了节点的承载能力以及主要的影响因素。通过有限元分析,讨论了节点区考虑组合效应的有效宽度取值。同时,推导得出考虑混凝土楼板组合效应的节点弹性受弯承载力和极限承载力的设计计算公式,对节点的抗震设计提出了建议。由对比结果可知,在对静力承载力分析结果进行折减后,计算值与试验值吻合良好,本文提出的设计方法可以用来指导工程实践。
After the earthquake abroad, it was found that the main reason for failure of composite joints is that the influence of concrete slab on node stiffness and bearing capacity is neglected. Based on the research and theoretical analysis of two types of 4 beam-column combination nodes, this paper evaluates the node carrying capacity and the main influencing factors. Through the finite element analysis, the effective width of the joint area considering the combined effect is discussed. At the same time, the design and calculation formula of the flexural and ultimate bearing capacity of the bridge considering the combined effect of concrete slab is deduced, and the suggestions for the seismic design of the joint are put forward. From the comparison results, it can be seen that the calculated value agrees well with the experimental value after the reduction of the static bearing capacity analysis result. The design method proposed in this paper can be used to guide the engineering practice.