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以混凝土经历的最高温度和CFRP布层数为参数进行了CFRP约束高温后混凝土力学性能试验研究。通过实测应力-应变曲线,研究温度和CFRP布层数对CFRP约束高温后混凝土抗压强度、极限应变和初始刚度等力学性能指标的影响规律。试验结果表明,CFRP约束显著影响了高温后混凝土受压破坏形态,并大幅度提高了高温后混凝土强度,说明CFRP约束可作为火灾后混凝土结构的一种有效的抢修与加固措施。同时,综合分析温度软化效应和CFRP约束强化效应对混凝土抗压强度的影响,CFRP约束强化效应处于主导地位。此外,在现有模型的基础上,提出了评估CFRP约束高温后混凝土力学性能的简化模型,经试验结果验证,该简化模型具有良好的精确性与实用性。
Based on the maximum temperature of concrete and the number of CFRP cloth layers, the experimental research on the mechanical properties of concrete after CFRP confined high temperature was carried out. The influence of temperature and CFRP number on the mechanical properties such as compressive strength, ultimate strain and initial stiffness of CFRP-confined concrete after high temperature was investigated by measuring the stress-strain curve. The experimental results show that the CFRP constraint significantly affects the compressive failure mode of concrete after high temperature and greatly increases the strength of concrete after high temperature. It indicates that the CFRP constraint can be used as an effective repair and reinforcement measure for concrete structure after fire. At the same time, the influence of temperature softening effect and CFRP confinement effect on the compressive strength of concrete is comprehensively analyzed, and the CFRP constraint reinforcement effect is in the leading position. In addition, on the basis of the existing models, a simplified model for evaluating the mechanical properties of concrete after CFRP confinement is proposed. The experimental results show that the simplified model has good accuracy and practicability.