采用不同节点形式的三维钢框架-组合楼板子结构抗连续倒塌性能试验研究  

Experimental Study on Progressive Collapse Resistance of 3D Steel Frame-composite Floor Substructures with Different Connection Types

作　　者：任鲁明 杨波[1,2] 孔德阳 REN Lu-ming;YANG Bo;KONG De-yang(Key Laboratory of New Technology for Construction of Cities in Mountain Area of Ministry of Education,Chongqing University,Chongqing 400045,China;School of Civil Engineering,Chongqing University,Chongqing 400045,China;Department of Civil and Environmental Engineering,National University of Singapore,Singapore 117576,Singapore)

机构地区：[1]重庆大学山地城镇建设与新技术教育部重点实验室,重庆400045 [2]重庆大学土木工程学院,重庆400045 [3]新加坡国立大学土木与环境工程系,新加坡117576

出　　处：《建筑科学与工程学报》2022年第3期75-83,共9页Journal of Architecture and Civil Engineering

基　　金：国家自然科学基金项目(51778086);重庆市杰出青年科学基金项目(cstc2020jcyj-jqX0026)。

摘　　要：为研究三维钢框架-组合楼板子结构的抗连续倒塌性能,对4个采用不同节点形式的1/3缩尺组合楼板试件在移除边柱工况下进行了拟静力试验。试件主梁与柱的连接形式为平齐式端板(FEP)节点、反向槽钢(RC)节点、狗骨式(RBS)节点与栓焊混合(WUFB)节点,次梁与柱及次梁与主梁的连接形式为腹板双角钢(DAC)节点或剪切板(FP)节点。通过特殊设计的6点加载系统实现位移控制下的均布荷载作用,获得了三维钢框架-组合楼板子结构加载全过程的荷载-位移曲线以及破坏模式,并分析了抗弯效应、悬链线效应及楼板的受拉薄膜效应对结构抗连续倒塌性能的影响。结果表明:对于主梁节点,采用栓焊混合连接的试件具有较高的初始刚度和极限承载力,而采用反向槽钢连接的试件则具有较好的延性,采用狗骨式连接的试件具有最好的能量吸收能力;对于次梁节点,采用剪切板连接的试件呈现出明显的脆性破坏特征,而其他采用腹板双角钢连接的试件发生的是延性破坏;在边柱失效情况下,抗弯效应在抵抗连续倒塌过程中一直起主导作用,楼板的受拉薄膜效应在结构的大变形阶段也发挥着一定的作用,而悬链线效应贡献较小,可忽略不计。To investigate the progressive collapse resistance of three-dimensional steel frame-composite floor structures, pseudo-static tests were carried out on four 1/3 down-scaled composite floor specimens with different connections under external column removal scenarios. The girder-to-column connections adopted flush-end-plate(FEP) connections, reverse channel(RC) connections, reduced beam section(RBS) connections and welded unreinforced flange-bolted web(WUFB) connections, while the girder-to-column and beam-to-girder connections employed double angle-cleat(DAC) connections and fin plate(FP) connections. The displacement-controlled uniform loading was applied by the specially designed 6-point loading system, and the load-displacement responses during the whole loading process and the failure modes of 3 D composite floor systems were obtained. The influences of flexural action(FA), catenary action(CA) and tensile membrane action(TMA) on progressive collapse resistance were analyzed. The results demonstrate that, in terms of girder-to-column connections, the specimen with WUFB connections shows higher initial stiffness and load-carrying capacity, while the specimen with RC connections shows better ductility, and specimen with RBS connections has the best energy absorption capacity during the failure process. In terms of girder-to-column and beam-to-girder connections, the specimen with FP connections shows obvious brittle failure characteristics, while the other specimens employed DAC connections fail in a ductile way. FA plays a leading role in progressive collapse resistance under the external column failure, while TMA plays a certain role at large deformation stage. The contribution of CA is small and negligible.

关 键 词：连续倒塌 钢框架-组合楼板子结构 节点形式 试验研究 抗力机制 

分 类 号：TU398[建筑科学—结构工程]