高强度螺旋箍筋约束下混凝土圆柱的抗震性能试验研究

Experimental study on seismic performance of circular columns confined by high-strength spiral stirrups

对3个配置HRB335、HRB500E、HRB600箍筋的混凝土圆形柱进行水平低周反复荷载作用下的拟静力试验,对比分析箍筋等强度代换时,箍筋强度对试件破坏状态、滞回曲线、骨架曲线、抗弯承载力、变形能力、延性性能和耗能能力的影响。结果表明:试件破坏模式均为典型的弯曲破坏,墩底出现塑性铰,纵筋断裂;试件采用高强度箍筋等强度代换普通箍筋时,试件抗弯承载力、变形能力、延性性能和耗能能力等抗震性能基本保持不变,采用高强度箍筋可以减少钢筋用量。

Reverse cyclic loading tests of 3 concrete circular column specimens confined by HRB335, HRB500E and HRB600 reinforcement were conducted. The effects of transverse reinforcement strength on the failure mechanism, load-deflection hysteretic-curve, skeleton curve, flexural capacity, deformation capacity, ductility capacity and energy dissipation capacity of concrete columns under equal strength replacement were compared and analyzed. The results show that, the columns confined by different strength transverse steel present typical flexural failure mode that pier bottom appears plastic hinge and longitudinal reinforcement fracture. Under equal strength transverse reinforcement replacement, the columns reinforced with different strength steel have similar seismic performance of flexural capacity, deformation capacity, ductility capacity and energy dissipation capacity. The using of high strength transverse reinforcement can reduce the consumption of steel while keeping similar seismic performance.