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为研究长期荷载作用下FRP(纤维增强复合材料)约束混凝土的变形和应力-应变关系,先通过8 616个混凝土徐变数据和4 320个混凝土收缩数据的分析,选择GL2000模型和Findley模型分别作为混凝土和FRP的徐变模型;然后根据FRP约束混凝土的平衡条件和几何条件,提出了长期变形的计算方法;最后采用考虑初始应力的FRP约束混凝土圆柱的极限应力、应变计算公式,并基于Teng模型的轴向-侧向应变关系和Mander本构模型的主动约束方程,采用增量迭代方法,建立了长期荷载作用下考虑初始应力的FRP约束混凝土应力-应变关系的分析模型,并与试验结果进行了对比。研究结果表明,采用提出的长期变形计算方法和混凝土应力-应变分析模型得到的约束混凝土应力-应变曲线与试验曲线吻合较好。
In order to study the deformation and stress-strain relationship of FRP (Fiber Reinforced Polymer) -constrained concrete under long-term loading, the GL2000 model and the Findley model were selected as the first through 8 616 concrete creep data and 4 320 concrete shrinkage data respectively Concrete and FRP. Based on the equilibrium conditions and geometrical conditions of FRP-confined concrete, the calculation method of long-term deformation is put forward. Finally, the ultimate stress and strain formula of concrete cylinder with FRP considering the initial stress and the formula of Teng model Axial strain relationship and Mander constitutive model, an analytical model of stress-strain relationship of FRP confined concrete under long-term load was established and compared with the experimental results Contrast. The results show that the stress-strain curve of the confined concrete obtained by the proposed long-term deformation calculation method and the concrete stress-strain analysis model is in good agreement with the experimental curve.