| 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 |
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| 引用本文： | 任鲁明,,杨波,,孔德阳.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[J].建筑科学与工程学报,2022,0(3):75-83. |
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| 作者姓名： | 任鲁明 杨波 孔德阳 |
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| 作者单位： | (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) |
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| 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。
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| 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 |
Experimental Study on Progressive Collapse Resistance of 3D Steel Frame-composite Floor Substructures with Different Connection Types |
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| REN Lu-ming,,YANG Bo,,KONG De-yang.Experimental Study on Progressive Collapse Resistance of 3D Steel Frame-composite Floor Substructures with Different Connection Types[J].Journal of Architecture and Civil Engineering,2022,0(3):75-83. |
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| Authors: | REN Lu-ming YANG Bo KONG De-yang |
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| Affiliation: | (1. Key Laboratory of New Technology for Construction of Cities in Mountain Area of Ministry of Education, Chongqing University, Chongqing 400045, China; 2. School of Civil Engineering, Chongqing University, Chongqing 400045, China; 3. Department of Civil and Environmental Engineering, National University of Singapore, Singapore 117576, Singapore) |
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| Abstract: | 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 3D composite floor systems were obtained. The influences offlexural 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. |
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| Keywords: | progressive collapse steel frame-composite floor substructure connection type experimental study load-resisting mechanism |
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