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目前对于纤维复材(FRP)管约束混凝土的研究主要集中于FRP管纤维缠绕角为±90°或接近±90°的情况,对于其他纤维缠绕角研究较少。通过对18个纤维缠绕角为±60°的FRP管约束混凝土短柱在单调荷载下的轴压试验,对FRP管约束混凝土短柱的破坏形态、应力-应变曲线和承载力进行了研究,分析了FRP管厚度、混凝土强度的影响。同时进行了6个纤维缠绕角为±80°(纤维缠绕方向接近环向即±90°)的FRP管约束混凝土短柱在单调荷载下的轴压试验,以对比研究±80°纤维缠绕角和±60°纤维缠绕角的影响。试验研究结果表明:FRP管约束混凝土短柱的破坏形态与FRP管纤维缠绕角有关;FRP管纤维缠绕角、FRP管厚度和混凝土强度是影响FRP管约束混凝土抗压强度的重要因素;FRP管约束混凝土的极限应变主要与混凝土强度等级有关,且极限应变随着FRP管厚度的增加而增大。
At present, the study of confined concrete with fiber composite (FRP) tubes mainly focuses on the case where the FRP tube has a fiber winding angle of ±90° or close to ±90°. There are few studies on other fiber wrap angles. The failure modes, stress-strain curves and load-carrying capacity of FRP pipe confined concrete short columns were studied by means of axial compression test of 18 concrete columns with FRP tube confined by ±60° under monotonous loading. The effect of FRP tube thickness and concrete strength. At the same time, six axial FRP tube-constrained concrete columns with a fiber winding angle of ±80° (fiber winding direction close to ±90° in the circumferential direction) were subjected to axial compression under a monotonous load, and a comparative study of ±80° filament winding angle was conducted. Effect of ±60° filament wrap angle. The experimental results show that the failure mode of the FRP pipe confined concrete short column is related to the filament winding angle of the FRP tube; the FRP tube filament winding angle, FRP tube thickness and concrete strength are important factors influencing the compressive strength of the FRP tube confined concrete; FRP tube restraint The ultimate strain of concrete is mainly related to the strength grade of the concrete, and the ultimate strain increases with the increase of the thickness of the FRP tube.