CFRP约束混凝土圆柱轴压本构模型研究

Study on the Constitutive Model of CFRP-confined Circular Concrete Columns under Axial Compression

CFRP约束混凝土的轴压本构模型是CFRP加固混凝土柱工程应用的科学依据和理论基础,众多的轴压本构模型虽有利于揭示科学问题的本质规律,但令工程技术人员难以适从。分析了CFRP约束圆截面混凝土的约束效应及影响因素;构建了更广泛的试验数据库;提出了横向约束率阈值的概念;对横向有效约束应力、极限抗压强度和极限压应变进行了归一化处理;对样本数据进行了筛查处理;建立了CFRP约束圆截面混凝土柱的工程型本构模型。

Constitutive Models of CFRP-confined concrete columns are of the scientific foundations and theoretical supports for the CFRP-reinforced concrete columns under axial compressive loadings. Many axial compression constitutive models can not only reveal the essential laws of scientific problems, but also make it difficult for engineers. It analyzed the constraint effect and influence factors of CFRP-confined circular concrete columns, set up a more extensive test database, gave a concept of transverse confined threshold, carried the normalized treatment of the transverse confined stresses, ultimate compressive strengths and ultimate pressure strains, screened and processed the sample data, proposed, and proposed the engineering-oriented constitutive model of CFRP-confined circular concrete columns based on the statistic analysis of test data and confined parameters.