Experimental study of precast dry connections constructed away from beam–column junction under progressive collapse scenario
Experimental study of precast dry connections constructed away from beam–column junction under progressive collapse scenario
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DOI：
10.1007/s42107-018-0099-z
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发表时间：
2018-10
影响因子：
--
通讯作者：
D. Joshi;P. Patel
中科院分区：
文献类型：
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作者：
D. Joshi;P. Patel
本文介绍了连续倒塌情景下预制干节点的试验研究。通过提供远离梁柱节点的连接，将缩小三分之一比例的预制梁柱组件构造为测试样本。试件尺寸取自总平面尺寸为16 m × 12 m的6层对称建筑。每个试件由两个跨梁和三个柱组成，中间柱被移除，这代表了连续倒塌的情况。预制构件之间的干连接采用两种不同的构造形式，如连接区域的钢板焊接和螺栓连接。利用液压千斤顶在拆除中柱处施加单调竖向荷载。测试试样的行为进行了测量，在极限承载能力，挠度曲线沿着长度，故障模式和裂纹扩展。并将干连接预制试件与整体连接预制试件的性能进行了比较。试验结果表明，预制干板焊接节点具有最大极限承载力，而预制干板螺栓节点的极限承载力低于整体节点。然而，预制干连接螺栓板的性能可以通过确保连接区域周围的混凝土浇筑质量来提高。基于研究，得出的结论是，建筑物具有预制构件连接远离梁柱连接处，具有足够的连接细节，其行为类似于整体结构，可以是现浇结构的可持续替代方案。
This paper presents experimental studies conducted on precast dry connections under progressive collapse scenario. Reduced one-third-scale precast beam–column assemblies are constructed as test specimen by providing connection away from beam–column junction. Dimensions of test specimens are extracted from 6-story symmetrical building having overall plan dimensions of 16 m × 12 m. Each specimen consists of two span beams and three columns with removed middle column, which represents progressive collapse scenario. Dry connection between precast elements were constructed by adopting two different types of detailing such as welding and bolting of steel plates at connection region. Monotonic vertical load was applied at the location of removed middle column with the help of hydraulic jack. Behavior of test specimens was measured in terms of ultimate load carrying capacity, deflection profile along the length, failure pattern and crack propagation. The performance of precast specimens having dry connection was also compared with that of monolithic connection. From the results of experimental studies, it was observed that precast dry connection with welded plates was having maximum ultimate load carrying capacity, while the same for precast dry connection with bolted plates was lesser than that of monolithic connection. However, performance of precast dry connection with bolted plates can be enhanced by ensuring appropriate quality of concreting around connection region. Based on the study, it was concluded that building having precast elements connected away from the beam–column junction with adequate connection detailing behaves similar to that of monolithic construction and can be a sustainable alternative of cast-in-place construction.