压-弯-扭耦合荷载作用下钢管约束钢筋混凝土柱抗震性能试验研究

Experimental study on seismic behavior of steel tube confined reinforced concrete columns subjected to combined compression-bending-torsion

为了研究钢管约束钢筋混凝土柱在轴压-弯曲-扭转耦合荷载下的抗震性能,开展了2个钢管约束钢筋混凝土柱在压-弯-扭耦合荷载下的拟静力试验,得到了弯-扭和压-弯-扭两种荷载工况下的荷载-变形曲线。试验结果表明:钢管约束钢筋混凝土柱在弯-扭荷载下的荷载-变形滞回曲线存在比较明显的"捏拢"效应,但在压-弯-扭荷载下的荷载-变形滞回曲线"捏拢"效应较小,当轴压力为受压承载力的30%时,压-弯-扭荷载下的钢管约束钢筋混凝土柱较弯-扭作用时具有更高的受弯和受扭承载力及良好的耗能能力。

In order to study the seismic behavior of steel tube confined RC( STRC) columns under combined compression-bending-torsion,two specimens were tested. The load-deformation hysteretic curves under bending-torsion and compression-bending-torsion loads were obtained. Results show that the pinching effect appeared in the loaddeformation hysteretic curves of STRC columns under bending-torsion load,but it is not obvious for specimens under compression-bending-torsion loads. When the axial pressure is 30% of compressive bearing capacity,STRC columns under compression-bending-torsion loads have higher bending capacity and torsion capacity,and the good energy dissipation capacity.