Cyclic behaviour of external diaphragm joint to CHS column with built-in replaceable links
Cyclic behaviour of external diaphragm joint to CHS column with built-in replaceable links
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DOI：
10.1002/stco.201610040
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发表时间：
2016-11-01
影响因子：
1.6
通讯作者：
Chan, Tak-Ming
中科院分区：
文献类型：
--
作者：
Khador, Majd;Chan, Tak-Ming
通过一系列足尺模型试验研究了工字钢梁与圆形空心柱外隔板节点的低周反复荷载作用下的性能。该节点包括两个横隔板（DP），焊接到柱的外壁，并使用锥形盖板（TCP）螺栓连接到梁的法兰。该接头设计为限制TCP的屈服和塑性铰接，而其他接头部件保持弹性。如果接头符合FEMA 356中损伤控制结构性能范围内的结构使用要求，则这是必要的。本文研究了TCP的两个参数：钢材等级和螺栓预紧力。发现使用较高的钢等级会对梁和DP施加不期望的较高应变要求，并且比具有较低等级的接头消耗更少的能量。螺栓预紧力的受控减小允许连接滑移超过正常使用极限，产生额外的能量耗散保险丝，并允许塑性铰区的旋转超过中等延性等级结构所需的25 mrad。
A series of full-scale laboratory experiments was conducted to investigate the cyclic behaviour of an external diaphragm joint between a steel I-beam and a circular hollow section column. The joint incorporated two diaphragm plates (DPs) welded to the column's external wall and bolted to the flanges of the beam using tapered cover plates (TCPs). The joint was designed to limit yielding and plastic hinging of the TCPs while the other joint components remained elastic. This is necessary if the joint is to qualify for use in structures classified in the damage control structural performance range according to FEMA 356. Two parameters of the TCPs are investigated in this paper: steel grade and bolt preload force. The use of higher steel grades was found to impose undesirable higher strain demands on the beam and DPs and dissipate less energy than the joints with the lower grade. A controlled reduction in the bolt preload force allowed connection slippage to occur beyond the serviceability limit, created an additional energy dissipation fuse and allowed rotation of the plastic hinge region to exceed the 25 mrad required for medium ductility class structures.