震后端板节点高温下的损伤退化行为  

Degradation behaviors of end-plate connections subjected to elevated temperature after earthquake fire

作　　者：朱飞[1] 郭震[1] 卢楠 高芮 

机构地区：[1]中国矿业大学力学与建筑工程学院,江苏徐州221200

出　　处：《武汉大学学报（工学版）》2017年第6期943-949,共7页Engineering Journal of Wuhan University

基　　金：江苏建筑节能与建造技术协同创新中心基金(编号:SJXTY1611);中央高校基本科研业务费专项资金资助(编号:2017XKQY049)

摘　　要：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.This paper presents the fire performances of an end-plate connections after cyclic loads. By using simplified models, the paper has conducted some parametric studies. The high temperature mechanical behaviors of a typical connection after monotonic loads are compared with that after cyclic loads. Parametrical studies include the effects of the end-plate thickness and bolt diameter on the fire resistance of connections. Numerical calculation results indicate that the after-earthquake fire behavior of connections has a different fire resistance compared with non-damage connections. Once fracture developing in connections, for instance end-plates or bolts fractured; the behavior of connections will degrade severely in after-earthquake fire. The research results can be adopted during the design stage in order to minimize the probability of collapse in the fire.

关 键 词：外伸端板型节点 循环荷载 地震次生火灾 破坏模式 

分 类 号：TU392[建筑科学—结构工程]