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介绍了循环荷载作用后的端板节点在高温下的力学性能.使用简化模型进行系统的参数研究,分组对比了同一个节点分别在单调荷载和循环荷载作用之后的高温力学性能,以及端板厚度、螺栓直径对节点抗火能力的影响.数值计算结果表明,地震往复荷载往往会给节点带来一定程度的破坏,当这种节点再遭遇随之而来的地震次生火灾时,节点已经有了初始的损伤,包括变形破坏和断裂破坏,此时节点的抗火能力、耐火时间都将受到一定程度的影响.尤其是往复荷载导致断裂破坏的节点,节点的抗火能力将严重下降.研究结果对该类梁柱节点设计具有一定参考价值.
The mechanical properties of the end plate joints subjected to cyclic loading at high temperature are introduced.The system parameters are studied by a simplified model and the high temperature mechanical properties of the same joint after monotonic loading and cyclic loading are compared respectively, , Bolt diameter on the fire resistance of the joint.Numerical results show that the seismic reciprocating load tends to bring a certain degree of damage to the node.When the node encounters subsequent secondary fires, the node already has The initial damage, including the deformation and failure, and the failure of the fracture, at this time the node’s fire resistance and refractory time will be affected to a certain degree, especially the resistance of the joint will be seriously reduced when the joint is damaged by reciprocating load. The results have certain reference value for the design of such beam-column joints.