钢管混凝土柱-钢梁错层节点抗震性能试验  

Experimental research on seismic behavior of concrete-filled steel tube column-steel beam staggered joints

作　　者：许成祥[1] 樊鸿博 郭骁 杨曌[1] XU Chengxiang;FAN Hongbo;GUO Xiao;YANG Zhao(School of Urban Construction,Wuhan University of Science and Technology,Wuhan 430063,China)

机构地区：[1]武汉科技大学城市建设学院,湖北武汉430063

出　　处：《武汉大学学报（工学版）》2021年第10期907-915,共9页Engineering Journal of Wuhan University

基　　金：国家自然科学基金项目(编号:51678457)。

摘　　要：为研究钢管混凝土柱-钢梁错层节点的抗震性能,按1∶3的缩尺比例设计并制作了8个钢管混凝土柱-钢梁错层节点试件,进行了低周往复荷载下的破坏试验。研究了轴压比、钢梁错开高度及剪压比对钢管混凝土柱-钢梁错层节点抗震性能的影响。通过对试件的滞回曲线、骨架曲线、刚度退化、承载力退化及延性、耗能能力等参数分析可知:轴压比的提高与剪压比的减小可以使钢管混凝土柱-钢梁错层节点获得更好的延性及耗能性能,轴压比提高0.2,试件延性系数μ与等效粘滞阻尼系数he分别提升5.3%与40%,剪压比减小33.5%,试件延性系数μ及等效粘滞系数he分别提升6.5%与39.5%;随着钢梁错开高度的增加,试件极限承载力呈现先增加后降低的趋势,钢梁错开高度达到一个梁高以后,受节点中部短柱影响,错层节点刚度增加,破坏趋向于边节点。In order to investigate the seismic performance of concrete-filled steel tube(CFST) column-steel beam staggered joints,eight specimens of CFST column-steel beam staggered joints were designed and manufactured according to a scale of 1∶3,and the destruction experiment under low-cycle reciprocating load was carried out.The effects of axial compression ratio,staggered height of steel beam and shear compression ratio on the seismic performance of concrete-filled steel tube(CFST) column-steel beam staggered joints were studied.Through the analysis of the hysteresis curve,skeleton curve,stiffness degradation,bearing capacity degradation,ductility,energy consumption and other parameters of the specimen,it can be known that the ductility and energy dissipation performance of the concrete-filled steel tubular column-steel beam can be better with the increase of axial compression ratio and the reduction of shear compression ratio.If the axial compression ratio increases by 0.2,the ductility coefficient μ and the equivalent viscous damping coefficient heof the specimen increase by 5.3% and 40%,respectively.When the shear ratio decreases by 33.5%,the ductility coefficient μand equivalent viscosity coefficient heof the specimen increase by 6.5% and 39.5%,respectively.With the increase of steel beam stagger height,the ultimate bearing capacity of specimen increases first and then decreases.After the staggered height of the steel beam reaches one beam height,the stiffness of the staggered joints increases and the failure tends to side joints due to the influence of short columns in the middle of the joints.

关 键 词：钢管混凝土柱 钢梁错层节点 错开高度 轴压比 剪压比 抗震性能 

分 类 号：TU398.903[建筑科学—结构工程]