与连续倒塌相关的T型钢连接破坏模式和梁柱子结构抗力机制研究  

Research on failure mode of connection with T-stub and resistance mechanism of beam-to-column substructure related to progressive collapse

作　　者：陈红 谭英华 郭玉旭[1,2] 胡亚超 席丰 CHEN Hong;TAN Yinghua;GUO Yuxu;HU Yachao;XI Feng(School of Civil Engineering,Shandong Jianzhu University,Jinan 250101,China;Key Laboratory of Building Structural Retrofitting and Underground Space Engineering(Shandong Jianzhu University),Ministry of Education,Jinan 250101,China;College of Civil Engineering and Architecture,Shandong University of Science and Technology,Qingdao 266590,China)

机构地区：[1]山东建筑大学土木工程学院,山东济南250101 [2]山东建筑大学建筑结构加固改造与地下空间工程教育部重点实验室,山东济南250101 [3]山东科技大学土木工程与建筑学院,山东青岛266590

出　　处：《四川建筑科学研究》2023年第6期46-56,共11页Sichuan Building Science

基　　金：国家自然科学基金项目(12172198、11672165);山东省研究生教育优质课程建设项目(SDYKC20158)。

摘　　要：关于T型钢连接破坏的研究已有很多,但与连续倒塌相关且关注弱轴效应的并不多见。利用非线性有限元软件ABAQUS进行了数值模拟,探讨了与结构连续倒塌相关的T型钢节点的连接性能和梁柱子结构的抗力机制。考虑了材料塑性与损伤演化,力求准确预报T型钢连接梁柱子结构在中柱失效条件下的破坏行为,重点考察了弱轴方向节点连接类型、节点构造和连接板尺寸效应对结构破坏模式和抗力机制转换的影响。分析结果表明:弱轴方向采用梁-板连接类型可以明显提升结构抗连续倒塌性能;加肋型节点能有效提升节点的变形能力和承载能力,表现出良好的抗连续倒塌性能;为避免结构抗倒塌性能下降,应合理选择弱轴连接板厚度。There are many literatures on the failure of T-stub connection,but few are related to progressive collapse and focus on the minor axis effect.The nonlinear finite element software ABAQUS was used to carry out numerical simulation to explore connection performance of T-stub joints and resistance mechanism of beam-to-column substructure related to progressive collapse of structures.The accurately prediction of the failure behavior of T-stub joints under the condition of middle column removed was attemped by taking into account of the material plasticity and damage evolution.And the effects of joint types,joint structural forms and the thickness of connecting plate in the minor axis on the structural failure mode and transformation of resistance mechanism were mainly investigated.The results of analysis show that the use of beam-plate connection in the minor axis direction can significantly improve the collapse resistance of the structure.The joint with stiffener can effectively improve the deformation capacity and bearing capacity of the joint,and show good resistance to progressive collapse.In order to avoid the reduction of the collapse resistance of the structure,the thickness of connecting plate in the minor axis should be reasonably selected.

关 键 词：连续倒塌 T型钢节点 抗力机制 节点加强 弱轴方向 

分 类 号：TU391[建筑科学—结构工程]