内配PVC管约束高强混凝土短柱抗震性能分析

Analysis of the seismic performance of embedded PVC tube confined reinforced high-strength concrete short columns

通过3根内配PVC管约束高强混凝土短柱和1根钢筋高强混凝土短柱的拟静力试验,揭示了内配PVC管约束高强混凝土短柱的破坏机理,分析了PVC管径高比和轴压比对构件受力性能的影响。试验结果表明:所有构件均发生剪切斜压破坏;与钢筋高强混凝土短柱相比,内配PVC管约束高强混凝土短柱的滞回曲线饱满,抗剪承载力提高,变形能力增强,能满足结构抗震的延性需求(μ≥3);当PVC管径高比D/h由0.375增至0.550时,构件的抗剪承载力增幅为1.49%,位移延性系数降幅为22.99%,建议PVC管径高比D/h控制在0.50左右;当轴压比n由0.25增至0.45时,构件的抗剪承载力提高了22.61%,位移延性系数降低了7.61%。

Based on the quasi-static test of three embedded PVC pipe confined reinforced high-strength concrete（ PVC-RHC） short columns and one reinforced high-strength concrete（ RHC） short column,the failure pattern of PVC-RHC short columns was revealed,the influencing of diameter height ratio of PVC tube and axial compression ratio on seismic performance was analyzed. Test results show that all members exhibit shear diagonal compression failure. PVC-RHC short columns has higher shear bearing capacity and deformation capacity than RHC short column. The diameter height ratio of PVC tube ranges from 0. 375 to 0. 550,the shear bearing capacity increases 1. 49%,and the displacement ductility coefficient decreases 22. 99%. The diameter height of PVC tube is advised to be controlled at about 0. 50. The axial compression ratio ranges from 0. 25 to 0. 45,the shear bearing capacity increases 22. 61%,and the displacement ductility coefficient decreases 7. 61%.