方钢管混凝土柱与钢梁全螺栓节点抗震性能试验研究

发布时间：2018-07-07 15:41

本文选题：全螺栓连接节点 + 摩擦　；参考：《建筑结构学报》2016年07期

【摘要】：通过对6个钢管混凝土柱-钢梁全螺栓连接节点及1个栓焊节点的低周反复加载试验,研究了全螺栓连接节点的破坏模式、承载力以及延性性能。试验表明:当试件的弹塑性层间位移角达到规范限值的2.15~3.02倍时,全螺栓连接试件仅在连接板件远端处钢梁翼缘上出现较小的鼓曲变形,变形幅度远小于栓焊节点;全螺栓连接节点具有更大的塑性变形能力、更大的峰值荷载和更长的屈服平台,能够满足抗震规范位移限值要求。试验指出,全螺栓连接节点的各组件在地震作用下都能发挥耗能作用,耗能机制包括连接板和钢梁翼缘间的摩擦耗能、栓杆与孔壁挤压耗能、连接板下的钢梁翼缘塑性变形耗能以及连接板远端处钢梁塑性耗能等。全螺栓连接试件的滞回曲线包括相对平直段和上升段,分别对应连接板与钢梁翼缘的滑动摩擦阶段和螺栓孔与螺杆的接触挤压阶段。试件经过多级位移循环加载后,摩擦力衰减明显,约为屈服荷载的50%;每级位移加载后期,由于螺栓杆与孔壁产生接触作用,试件的承载力相比摩擦滑移阶段明显增大,并且随位移加载幅值的增大而增大,峰值荷载可达到屈服荷载的2~3倍。
[Abstract]:The failure mode, bearing capacity and ductility of six concrete-filled steel tubular (CFST) column-steel beam connections and one bolted joint under low cycle cyclic loading were studied. The test results show that when the elastic-plastic interlayer displacement angle of the specimen reaches 2.15 ~ 3.02 times of the specified limit, only small bulging deformation occurs on the flange of the steel beam at the distal end of the connecting plate, and the deformation range is much smaller than that of the bolted joint. The full bolt connections have more plastic deformation capacity, larger peak load and longer yield platform, which can meet the limit requirements of seismic code displacement. The test results show that all components of all bolted joints can play a role in energy dissipation under earthquake. The mechanism of energy dissipation includes friction energy dissipation between connecting plate and steel beam flange, extrusion energy between bolt rod and hole wall. The plastic deformation of the flange of the steel beam under the connecting plate and the plastic energy dissipation of the steel beam at the distal end of the connecting plate. The hysteretic curves of the whole bolted specimens include the relative straight section and the rising section respectively corresponding to the sliding friction stage between the connecting plate and the flange of the steel beam and the contact extrusion stage between the bolt hole and the screw. After the multistage displacement cyclic loading, the friction force attenuates obviously, which is about 50% of the yield load. At the later stage of displacement loading, the bearing capacity of the specimen increases obviously compared with the friction slip stage because of the contact between the bolt rod and the hole wall. With the increase of the amplitude of displacement loading, the peak load can reach 2 ~ 3 times of yield load.
【作者单位】：山东科技大学山东省土木工程防灾减灾重点实验室;中国煤炭科工集团南京设计研究院有限公司;
【基金】：国家自然科学基金项目(51178259)
【分类号】：TU398.9;TU352.11

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