方钢管混凝土柱与钢梁全螺栓节点抗震性能试验研究  

Experimental study on seismic performance of concrete-filled square steel tubular column and steel beam with field-bolted connections

作　　者：邓芃[1] 王来[1] 李申琰 刘艳[1] 

机构地区：[1]山东科技大学山东省土木工程防灾减灾重点实验室,山东青岛266590 [2]中国煤炭科工集团南京设计研究院有限公司,江苏南京210031

出　　处：《建筑结构学报》2016年第7期19-28,共10页Journal of Building Structures

基　　金：国家自然科学基金项目(51178259)

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。In order to obtain the failure mode, bearing capacity and the ductility of field-bolted connection, six specimens of field-bolted connections between the concrete-filled square steel tubular column and steel beam and a welded-flange-bolted-web connection subjected to cyclic loading were investigated. The experiment shows that when the elasto-plastic inter-story drift ratio is 2.15-3.02 times of the code limit, small deformation of the field-bolted joint appears at the beam flange on the far side of the connection plate, which is obviously smaller than that of the welded- flange-bolted-web connection. Field-bolted joints can meet the requirements of seismic design with larger plastic deformation capacity, larger ultimate bearing capacity and better ductility than the weld-flange-bolted-web connection. The results show that the constituents of field-bolted connections have the energy dissipation capacity which includes the friction energy dissipation between the connecting plate and the steel beam flange, the energy dissipation due to the contact of the bolt shank and hole, plastic deformation energy dissipation of the steel beam flange, and the plastic hinge energy dissipation. The hysteretic curves of field-bolted specimens can be divided into two stages including relatively flat stage and arising stage, which correspond to the sliding friction stage of the connection and the contact stage of the bolt and hole. The friction decreases obviously after multi-level displacement loading of the yield load. Due to the contact of the bolt and hole wall, the bearing capacity the end of each displacement 1 reach to 2-3 times of the yield oading compared with the friction-sliding stage, and load. of specimens the ultimate , which is about 50% increases obviously at bearing capacity can reach to 2-3 times of the yield load.

关 键 词：全螺栓连接节点 摩擦 低周反复加载试验 塑性变形 抗震性能 

分 类 号：TU398.9[建筑科学—结构工程] TU317.1