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为研究GFRP套管钢筋混凝土短柱的轴压力学性能,进行了22个GFRP套管钢筋混凝土短柱和6个无GFRP套管约束的钢筋混凝土短柱对比试验。研究了影响GFRP套管钢筋混凝土组合短柱轴压力学性能的主要因素,包括GFRP套管不同的受力方式、混凝土强度、纵筋配筋率等。试验结果表明:由于GFRP套管的约束,提高了核心混凝土的强度,增大了核心混凝土的变形能力;GFRP套管在不同的受力方式下,组合短柱的轴压承载力和变形基本相同;GFRP套管内配置纵筋可提高GFRP套管混凝土短柱的轴压承载力,适当提高纵筋配筋率可改善短柱的延性。根据试验结果及现有FRP管约束混凝土轴心抗压强度计算公式,建议了GFRP套管钢筋混凝土短柱承载力计算公式,计算结果与试验结果基本吻合。
In order to study the axial compressive properties of GFRP short-sleeved reinforced concrete short columns, comparative experiments were carried out between 22 GFRP short-sleeved RC columns and 6 RC columns without GFRP sleeves. The main factors influencing the axial compressive properties of GFRP shielded concrete short columns are studied, including different stress modes of GFRP bushing, concrete strength, longitudinal reinforcement ratio and so on. The experimental results show that due to the restraint of GFRP casing, the strength of core concrete is increased and the deformation capacity of core concrete is increased. Under different stress modes, the bearing capacity and deformation of the composite short columns are basically the same The longitudinal reinforcement in the GFRP casing can increase the axial compressive bearing capacity of GFRP concrete short columns and improve the ductility of the short columns by properly increasing the longitudinal reinforcement ratio. Based on the test results and the formula of the compressive strength of existing FRP tube constrained concrete, the calculation formula of the bearing capacity of GFRP short steel reinforced concrete short columns is proposed. The calculated results agree well with the experimental results.