钢管混凝土柱-环梁节点抗震性能的试验研究

混凝土环梁节点是钢管混凝土柱与混凝土梁连接的一种新型节点。通过14个钢管混凝土柱-环梁节点模型的低周反复荷载试验,研究了环梁节点的抗震性能。试验结果表明:无论塑性铰出现在框架梁端还是在环梁上,试件都有很好的弹塑性变形能力;达到最大承载力时,大部分试件的钢管柱转角即层间位移角已超过1/120,滞回曲线比较饱满;承载力下降时,滞回曲线虽有不同程度的捏拢,但不严重,试件有较好的耗能能力;环梁节点的钢管混凝土柱与环梁相对独立,节点的破坏基本上不影响钢管混凝土柱的承载力。

Experimental Research on Seismic Behavior of Concrete Filled Steel Tubular Column Ring Beam Joint Under Cyclic Loading

Concrete ring beam joint is a new type of connection for joining the concrete filled steel tubular column and the concrete frame beam. By experiment on fourteen concrete filled steel tubular column ring beam joint specimens subjected to cyclic lateral load, the seismic behavior of the ring beam joint was studied with the following achievements obtained. No matter the plastic hinge was at the end of frame beam or on the ring beam the specimens had large elastic plastic deformation capacity. The rotation angle of the column ( i.e.the relative story drift) was larger than 1/120 for most specimens when the maximum load was reached and the hysteresis loops were plump. At the descending stage of lateral load the loops had differing extent of pinch. In general the specimens exhibited good energy dissipation capacity. Due to the independence of the concrete filled steel tubular column and the ring beam at the connection, failure of the joint would not influence the load carrying capacity of column.