钢骨混凝土异形柱-钢梁节点抗震性能试验研究

Tests for aseismic behavior of frame joints between a steel reinforced concrete special column and a steel beam

为了研究钢骨混凝土异形柱-钢梁节点的抗震性能,进行了4个T形钢骨混凝土柱-钢梁节点和4个L形钢骨混凝土柱-钢梁节点的拟静力试验。试验考虑了混凝土强度等级、核心区配箍率和轴压比等参数的影响,对骨架曲线、承载力、核心区剪切变形、延性和耗能能力等抗震性能指标进行了分析。结果表明,在低周往复荷载作用下,钢骨混凝土异形柱-钢梁框架节点滞回曲线饱满,表现出良好的延性性能和耗能能力,典型破坏形态为节点核心区剪切斜压破坏和节点区焊缝失效破坏;高轴压力下节点具有较高的承载能力但延性性能降低;混凝土强度越高,节点承载能力越大,但延性性能越差;增大核心区配箍率对试件的延性和承载力有明显的提高,并能改善试件屈服后的耗能能力。

To study failure modes and aseismic behavior of frame joints between a steel reinforced concrete special column and a steel beam,4 joints with T-shaped section and 4 joints with L-shaped section were tested under reversed cyclic loading. The parameters of concrete strength,axial compression ratio,and core area stirrup ratio were taken into account. The deformation characteristics and the failure modes were investigated. Hysteretic characteristics,skeleton curves,load-bearing capacity,shear deformation of core zone,ductility and energy dissipation ability were analyzed. The results indicated that the failure modes contain shear diagonal compression failure and core zone welding crack failure; the failure modes are determined with axial compression ratio; the specimen possesses a plump hysteretic loop with a good aseismic performance under reversed cyclic loading; with increase in axial column load,the joints’ load-bearing capacity increases,but their displacement ductility decreases; the ultimate strength,ductility and energy dissipation capacity can be enhanced by increasing the stirrup ratio of core zone.