火灾下平齐端板节点考虑剪力作用的组件模型研究  

Research on component-based model for flush endplate connections in fire considering the effect of the shear force

作　　者：高义奇 余红霞[1] 施刚[1] Gao Yiqi;Yu Hongxia;Shi Gang(Key Laboratory of Civil Engineering Safety and Durability of China Education Ministry,Department of Civil Engineering,Tsinghua University,Beijing 100084,China)

机构地区：[1]土木工程安全与耐久教育部重点实验室清华大学土木工程系

出　　处：《建筑结构》2018年第19期55-60,共6页Building Structure

基　　金：国家自然科学基金项目（51778328）;国家自然科学基金优秀青年科学基金项目（51522806）.

摘　　要：对已有的平齐端板节点的组件模型进行改进,考虑了剪力与拉、弯作用的耦合效应,并用三维有限元分析的结果对组件模型进行了验证。采用该组件模型,可以方便地得到节点在同时承受拉、剪、弯综合荷载作用时的性能。结果表明,增大剪力会导致节点失效温度的降低,但温度低于550℃时剪力对节点变形的影响不大;端板越厚、节点承受的弯矩及拉力越小时,剪力的影响更为显著,端板为8mm时剪力对节点性能的影响可忽略;悬链拉力会显著影响节点的性能,因此火灾时应考虑节点可能受到的附加拉力的影响。A previous component-based model for flush endplate connections was improved by incorporating the coupling effect between the shear force and the tensile or bending action of a connection. The model was validated against the three-dimensional finite element simulation results. With this model, the behavior of connections under the combined effects of tension, shear and moment can be obtained conveniently. The analysis results indicate that increase of the shear force can reduce the connection failure temperature, but the effect of shear force to connection deformation is not big before the temperature reaches 550℃. Shear force has more significant effect on connection resistance when the endplate thickness increases and the tension or moment action decreases. When the endplate is only 8 mm, effect of shear on the connection behaviour is negligible. Catenary tying force can significantly affect the performance of connections in fire and should be taken into consideration appropriately.

关 键 词：平齐端板节点 组件模型 弹簧模型 剪力 高温 

分 类 号：TU391[建筑科学—结构工程]