高强螺旋箍筋约束混凝土柱抗震性能试验

摘要

In order to study the seismic behavior of the concrete columns confined with highstrength spiral stirrups,the low cyclic loading tests of two ordinary stirrup concrete columns and two concrete columns confined with high-strength spiral stirrups full scale model were finished,and the failure process and failure pattern of concrete columns confined with high-strength spiral stirrups were described.Meanwhile,the hysteresis curves,skeleton curves,ductility performance,and energy dissipation capacity were analyzed.The results show that the axial compressive ratio is one of the main factors to impact specimen ductility performance.The improvement effect of concrete columns confined with high-strength spiral stirrups under high axial compression ratio on frame column ductility performance and energy dissipation capacity is very obvious.In the same axial compression ratio,the concrete columns confined with highstrength spiral stirrups show the advantages including full hysteresis curves and no pinch phenomenon,smooth nondimensional skeleton curve decline period,good ductility performance.%为了研究高强螺旋箍筋约束混凝土柱的抗震性能,完成了2个普通箍筋混凝土柱及2个高强螺旋箍筋约束混凝土柱足尺模型的低周反复荷载试验,描述了高强螺旋箍筋约束混凝土柱的破坏过程及破坏形态,分析了高强螺旋箍筋约束混凝土柱的滞回曲线、骨架曲线、延性性能和耗能能力.结果表明:轴压比是影响试件延性性能的主要因素之一；高强螺旋箍筋约束混凝土柱在高轴压比作用下对框架柱延性性能及耗能能力提高的效果非常明显；在轴压比相同的条件下,高强螺旋箍筋约束混凝土柱滞回曲线饱满且无捏缩现象,量纲一的骨架曲线下降段平稳,延性性能较好.