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对6个FRP-PVC管约束圆形截面钢筋混凝土组合柱试件进行滞回性能试验,研究轴压比n、FRP横向包裹层数m和FRP类型对组合柱在低周往复荷载作用下的破坏模式、滞回特性、位移延性、能量耗散能力、承载力退化、刚度退化等性能的影响。试验结果表明,当外包FRP-PVC管开裂并退出工作时,试件承载力呈跳跃式下降,试件退化为钢筋混凝土柱,可将外包FRP-PVC管的开裂作为该类构件即将破坏的首次预警;所有试件的滞回曲线均较为饱满,捏缩现象不明显,滞回性能良好;试件的承载力退化不显著;轴压比的增大提高了试件的峰值荷载,同时延缓了刚度退化趋势,降低了试件的耗能能力;与BFRP包裹的试件相比,CFRP包裹试件的峰值荷载、耗能能力有所提高,刚度退化延缓;BFRP包裹层数的增加可以延缓试件刚度退化并提高其延性。
The hysteretic behavior of 6 FRP-PVC pipe constrained circular cross-section reinforced concrete column specimens was studied. The effects of axial compression ratio n, number of FRP transversely wrapped layers m and FRP type on the failure of composite columns under low cyclic reciprocating loads Mode, hysteresis characteristics, displacement ductility, energy dissipation capacity, bearing capacity degradation, stiffness degradation and other properties. The test results show that when the outsourced FRP-PVC pipe is cracked and withdrawn from work, the load-bearing capacity of the FRP-PVC pipe drops abruptly and the test piece degenerates into a reinforced concrete column. As a result, the cracking of the FRP- The hysteresis curves of all the specimens are relatively full, the phenomenon of pinch shrinkage is not obvious and the hysteretic behavior is good. The bearing capacity degradation of the specimens is not significant. The increase of axial compression ratio increases the peak load of the specimens and delays Compared with BFRP wrapped specimens, the CFRP wrapped specimens showed an increase in peak load and energy dissipation and a delay in stiffness degradation. The increase in the number of BFRP wrappings could be postponed The stiffness of the piece degenerates and increases its ductility.