CFRP约束高温后混凝土力学性能试验研究

发布时间：2018-05-22 17:22

本文选题：高温后混凝土 + CFRP约束　；参考：《工程力学》2017年09期

【摘要】：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。
[Abstract]:Taking the maximum temperature of concrete and the number of CFRP layers as parameters, the mechanical properties of concrete subjected to CFRP confinement were studied. The influence of temperature and CFRP layer number on the compressive strength, ultimate strain and initial stiffness of concrete confined by CFRP was studied by measuring the stress-strain curve. The experimental results show that the compressive failure of concrete under high temperature is significantly affected by CFRP constraint, and the strength of concrete after high temperature is greatly increased, which indicates that CFRP constraint can be used as an effective method for repairing and strengthening concrete structures after fire. At the same time, the influence of temperature softening effect and CFRP constraint strengthening effect on the compressive strength of concrete is comprehensively analyzed. In addition, based on the existing models, a simplified model for evaluating the mechanical properties of concrete under CFRP restraint at elevated temperature is proposed. The experimental results show that the simplified model has good accuracy and practicability.
【作者单位】：湖南大学教育部建筑安全与节能重点实验室;华侨大学土木工程学院;
【基金】：国家重点基础研究发展计划子课题项目(2012CB026204) 国家自然科学基金项目(51378200)
【分类号】：TU528

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