考虑节点域加强的Q690GJ高强钢梁柱节点抗震性能试验研究  

EXPERIMENTAL RESEARCH ON THE ASEISMIC BEHAVIOR OF Q690GJ HIGH STRENGTH STEEL BEAM-TO-COLUMN CONNECTIONS CONSIDERING REINFORCED PANEL ZONE

作　　者：徐明[1] 陆建锋[2] 李红兵[1] 舒赣平[1] 侯兆新[3] 邱林波[3] 

机构地区：[1]东南大学混凝土及预应力混凝土结构教育部重点实验室,南京210096 [2]江苏省电力公司淮安供电公司,江苏淮安223002 [3]中冶建筑研究总院有限公司,北京100088

出　　处：《钢结构》2016年第3期6-13,共8页Steel Construction

基　　金："十二五"国家科技支撑计划课题(2012BAJ13B01)

摘　　要：对4个梁端盖板加强-翼缘削弱型梁柱中节点试件进行低周反复荷载试验,主要研究节点域设置补强板和斜向加劲肋对高强钢节点的破坏模式、承载能力、转动能力、延性及耗能能力等的影响,并与ANSI/AISC 341-05推荐方法的计算结果进行对比,试验中,普通试件的破坏形式为节点域出现剪切塑性铰,节点域加强试件在翼缘削弱处发生明显塑性变形;经分析节点域贴焊的等厚补强板参与工作的程度为54%,斜加劲肋则为38%,从节点承载力来看,两者的加强效果相当;由于加载条件所限,各试件的延性和耗能能力并未达到预期的指标,但试件贴焊斜加劲肋后,转角延性系数降低约67%,节点域等效阻尼系数降低约38%,表明节点域加强后其转动能力及耗能能力急剧下降;对于高强度钢材,ANSI/AISC 341-05有关节点域抗剪承载力的计算规定偏于保守。Experiments on four interior beam-to-column connections with both strengthened cover plate and reduced beam section under low-frequency cyclic loading were conducted. This research focused on evaluating the influence of panel zone stiffening plates and diagonal stiffeners on the failure mode,bearing capacity,rotational capacity,ductility and energy dissipation capacity of the high strength steel connections,meanwhile,comparing the test results with the calculations on the basis of the recommended of ANSI / AISC 341- 05. The results indicated that shear plastic hinge occured in the panel zone for unreinforced connections,while obvious plastic deformation occured in the reduced beam section for connections with reinforced panel zone. The conclusion could be drawn that the participation ratio of equal-thickness stiffening plates was 54% and the participation ratio of diagonal stiffeners was 38%,and both reinforcing effects were fairly similar in terms of bearing capacity. Due to the limitations of the loading conditions,ductility and energy dissipation capacity of all specimens did not achieve the anticipated indexes. The rotation ductility coefficient of the connections with panel zone diagonal stiffener decreased by about 67% while the equivalent damping coefficient of that panel zone decreased by about38%,which certified that rotational capacity and energy dissipation capacity of the panel zone declined abruptly after strengthened. Furthermore,the specification about shear capacity in panel zone of high strength steel in ANSI / AISC 341-05 was comparatively conservative.

关 键 词：高强度钢材 梁柱节点域 破坏模式 抗震性能 抗剪承载力 

分 类 号：TU391[建筑科学—结构工程] TU352.11