组合梁-方钢管柱节点抗连续倒塌性能数值模拟  

Numerical Analysis of Joint of Composite Beam and Rectangular Steel Tube Under Progressive Collapse Condition

作　　者：孙昕 王俊杰[2,3] 赵勇 王伟[2,3] SUN Xin;WANG Junjie;ZHAO Yong;WANG Wei(School of Urban and Rural Planning&Civil Engineering,Guiyang University,Guiyang 550005,China;State Key Laboratory of Disaster Reduction in Civil Engineering,Tongji University,Shanghai 200092,China;Department of Structural Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]贵阳学院城乡规划与建筑工程学院,贵阳550005 [2]同济大学土木工程防灾国家重点实验室,上海200092 [3]同济大学建筑工程系,上海200092

出　　处：《工业建筑》2022年第5期140-146,共7页Industrial Construction

基　　金：贵州省教育厅青年科技人才成长项目(黔教合KY字[2018]304,GYU-KY-[2022])。

摘　　要：采用通用有限元软件ABAQUS建立组合梁-方钢管柱刚接节点在中柱失效条件下的精细化有限元模型,研究节点在失效柱处(中柱节点)和相邻柱处(边柱节点)两种状态下的抗连续倒塌性能,考察两个节点的破坏机制和力学性能等。结果表明,中柱节点的承载力由弯曲机制、压拱效应和悬索机制共同组成,边柱节点的承载力由弯曲机制和悬索机制共同组成。其中,压拱效应显著提升了中柱节点在抗弯阶段的承载力并且延迟了悬索机制发挥作用的时间。根据能量原理将两个节点的静力性能曲线转化为更符合实际工况下的动力响应曲线,采用简化评估方法证明两个节点具有足够的抗连续倒塌能力。The finite element model of joint of composite beam and rectangular steel tube was established to investigate the resistance under the progressive collapse scenario through finite element software ABAQUS. The middle-joint above the removed column and the side-joint adjacent to the removed column were considered to investigate the failure mode and resistance mechanism.The results showed the resistance mechanism of middle joint was flexural action, compressive arch action and catenary action, while the resistance mechanism of side joint was flexural action and catenary action. Compressive arch action significantly improved the bearing capality load resistance at flexural stage and delays the catenary action for middle joint. According to the principle of energy, the static responses of two joints were transformed into dynamic responses.With the simplified assessment method, the results indicated that these two joints had enough resistance to withstand progressive collapse.

关 键 词：连续倒塌 数值模拟 刚接节点 压拱效应 悬索机制 

分 类 号：TU398.9[建筑科学—结构工程]