碳纤维增强复合材料约束高温损伤高强混凝土轴压力学性能的试验研究

EXPERIMENTAL STUDY OF AXIAL COMPRESSIVE BEHAVIOR OF CFRP-CONFINED HIGH-STRENGTH CONCRETE DAMAGED BY HIGH TEMPERATURE

以碳纤维增强复合材料（CFRP）约束高强混凝土（HSC）圆柱为研究对象，通过试验探讨温度损伤和 CFRP 用量对 CFRP 约束高温损伤 HSC 圆柱轴压的破坏模式、抗压强度和极限应变等的影响规律。研究结果表明：CFRP 的约束能明显提高高温损伤 HSC 柱的抗压强度，与 CFRP 约束常温的混凝土试件相比，包裹了相同 CFRP 层数高温损伤试件的抗压强度仅下降3％～6％；温度损伤和 CFRP 层数对约束 HSC 构件轴压破坏形态有明显的影响；被约束高强混凝土柱的抗压强度和延性随着 CFRP 层数的增加而提高，与无温度损伤 HSC 受压构件相比，CFRP 的约束对提高高温损伤 HSC 构件抗压性能的作用更加明显。

An experimental study was conducted to investigate into the axial compressive behavior of thermal damaged high-strength concrete （HSC） confined with carbon fiber reinforced polymer （CFRP）.Based on tests, the axial compression failure mechanism was discussed, and the effects of the thermal damage and the amount of CFRP on the compressive performance were analyzed.The results show that CFRP confinement is highly effective for enhancing the compressive strength and deformation capacity of the thermal damaged HSC columns.Comparing with that of the no damaged cylinders, the compressive strength of the damaged cylinders confined with same amount CFRP was decreased only by 3% -6%.The thermal damage and the amount of CFRP had obvious effects on the failure mode of the CFRP-confined HSC cylinders.The compressive strength and ductility of the CFRP-confined HSC cylinders were increased with the increase of the CFRP amount.It should be noted that CFRP confinement can give a better improvement for the axial compressive behavior of the thermal damaged HSC than that of normal HSC.