考虑楼板组合作用的复式钢管混凝土柱-钢梁节点抗震性能试验研究  

Experimental study on seismic performance of connection between concrete-filled double steel tubular(CFDST) column and steel beam considering composite effect of RC slab

作　　者：张冬芳[1] 贺拴海[2] 赵均海[1] 代岩[1] 张磊[1] ZHANG Dongfang;HE Shuanhai;ZHAO Junhai;DAI Yan;ZHANG Lei(School of Civil Engineering, Chang＇ an University, Xi＇ an 710061, China;Highway School, Chang＇ an University, Xi＇ an 710064, China)

机构地区：[1]长安大学建筑工程学院,陕西西安710061 [2]长安大学公路学院,陕西西安710064

出　　处：《建筑结构学报》2018年第7期55-65,共11页Journal of Building Structures

基　　金：国家自然科学基金项目(51508028);中国博士后科学基金项目(2014M562357);中央高校基本科研业务费专项(300102288112)

摘　　要：为研究楼板的组合作用对复式钢管混凝土柱-钢梁节点抗震性能的影响,进行了4个考虑楼板组合作用的节点和1个不考虑楼板组合作用的钢梁节点的低周往复荷载试验,分析了不同构造和混凝土楼板对节点破坏形态、滞回曲线、承载能力、刚度退化、延性和耗能能力等的影响。结果表明：该类节点构造合理,满足“强节点弱构件”的抗震设计原则;不考虑楼板组合作用的节点试件的破坏形态为梁端破坏,考虑楼板组合作用的节点试件的破坏形态为梁端破坏和柱端破坏;楼板与钢梁的组合作用使节点承载力提高显著,但延性提高不明显,破坏时钢梁下翼缘的变形和焊缝撕裂程度增大;锚固腹板设置加劲肋有效延缓了钢梁下翼缘破坏,提高了组合节点的耗能能力;该组合节点试件滞回曲线较饱满,刚度退化明显,承载力退化不明显,等效黏滞阻尼系数介于0.282～0.311之间,转角延性系数和层间位移角均满足规范要求,具有较好的抗震性能。In order to investigate the composite effect of RC slab on the seismic behavior of connection between concrete-filled double skin steel tubular （CFDST） column and steel beam, four joints considering the composite effect of RC slab and one joint without considering the composite effect of RC slab were tested under low-cyclic loading. The effects of the different construction details and RC slab on failure modes, hysteresis loops, bearing capacity, stiffness degradation, ductility and energy dissipation were investigated. The results indicate that the construction details of the composite joint are reasonable to satisfy the design principle of ＇ strong joint, weak component＇ for seismic resistance. The failure mode of the joint without considering the composite effect of RC slab is the beam failure. However, the failure modes of the joint considering the composite effect of RC slab are beam failure and column failure. Because of the composite effects of RC slab and steel beam, the bearing capacity of the composite joint is increased significantly. However, the ductility is increased inapparently, and the deformation and weld seam at the bottom flanges of the composite joint are increased remarkably at the failure stage. The failure of the steel beam bottom flange of the composite joint is delayed and energy dissipation is enhanced due to the anchorage plate with ribs. This type of composite joint exhibits plump hysteresis loops, obvious stiffness degradation, insignificant bearing capacity degradation. The equivalent viscous damping coefficients are between 0. 282 - 0.311. The ductility factor and interstory drift ratio of the composite joint can satisfy the requirements of the technical regulations. The composite joint shows favorable seismic resistance behavior.

关 键 词：组合节点 复式钢管混凝土柱 钢梁 钢筋混凝土楼板 拟静力试验 抗震性能 

分 类 号：TU398.903[建筑科学—结构工程]