平面KK型圆钢管相贯节点平面外受弯性能研究  

Behavior of unstiffened CHS KK-joints under cyclic out-of-plane bending

作　　者：陈以一[1] 赵必大[2] 王伟[1,2] 孟宪德[2] 

机构地区：[1]同济大学土小工程防灾国家重点实验室,上海200092 [2]同济大学土木工程学院,上海200092

出　　处：《土木工程学报》2010年第11期8-16,共9页China Civil Engineering Journal

基　　金：科技部国家重点实验室基金(SLDRLE08-A-04);高等学校博士学科点专项科研基金(20070247048)

摘　　要：对平面KK型圆钢管相贯节点在不同荷载形式(工况)下的平面外受弯性能进行研究。进行几何构造相同的两个节点试件在同向(KKBH-1)、反向(KKBH-2)平面外反复弯曲作用下的滞回试验。介绍节点试验的方案与测试原理,考察不同荷载形式下节点的受力性能和破坏模式。研究结果表明,无论哪种荷载形式,节点的破坏模式均为相贯线附近焊缝热影响区主管管壁冲剪破坏,节点均表现出较好的延性与抗震性能;节点更多是依赖主管管壁开裂后裂缝的扩散及塑性变形来耗能,尤其是对于KKBH-1试件;KKBH-1的屈服荷载与极限承载力均低于KKBH-2,但延性略强于KKBH-2。试验研究及应用有限元软件ABAQUS的分析均表明,不同的荷载形式对节点的受力性能影响较大,KKBH-1表现出节点承载力低于构件承载力的性能,而KKBH-2则相反。To study the cyclic out-of-plane bending behavior of unstiffened tubular KK-joints under two different load cases, two specimens with identical construction details were tested under unidirectional cyclic out-of-plane bending （KKBH-1） and reverse cyclic out-of-plane bending （KKBH-2）. The test procedure and theory are presented, and the mechanical behaviors and failure patterns of the joints studied. It is found that all joints with different load cases perform excellently in deformability and seismic-resistance, that the failure patterns of the joints are punch failure of the chord wall near to the intersection and effected by welding thermal stress, that the energy dissipation of the joints largely rely on the crack propagation and plastic deformation after cracking, especially for the KKBH-1 joints, and that the yield load and ultimate bearing capacity of KKBH-1 is lower than those of KKBH-2, but the ductility of the former is better than the latter. Both test and nonlinear FEA by ABAQUS show that the type of load has relatively large effect on the mechanical behavior of KK-joint, and KKBH-1 joint can develop lower bending capacity than those of other branches, but the reverse holds true for KKBH-2 joint.

关 键 词：圆钢管结构 KK型相贯节点 平面外受弯 破坏模式 能耗 延性 极限承载力 

分 类 号：TU356[建筑科学—结构工程]