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通过8根组合柱的试验,分析了影响GFRP管劲性钢筋混凝土组合柱的轴心受压承载力主要因素。试验结果表明,组合柱的承载力随着GFRP管壁厚度的增加而提高;内部型钢约束混凝土并与钢筋共同承担一定荷载,提高了组合柱的承载力。基于极限平衡理论和统一理论,分别建立了GFRP管劲性钢筋混凝土组合柱和GFRP管钢筋混凝土组合柱的轴压承载力计算公式,计算结果与试验结果吻合良好。统一理论的计算结果与试验结果更为接近,且计算公式简单。
Through the experiment of eight composite columns, the main factors influencing the axial compressive bearing capacity of GFRC pipe reinforced composite columns are analyzed. The test results show that the bearing capacity of the composite column increases with the increase of the thickness of the GFRP pipe. The internal steel constrains the concrete to bear a certain load with the steel bar and increases the bearing capacity of the composite column. Based on the theory of limit equilibrium and unified theory, the formulas for calculating the axial compressive bearing capacity of GFRP pipe reinforced concrete composite column and GFRP pipe reinforced concrete composite column are respectively established. The calculated results are in good agreement with the experimental results. The result of unified theory is more similar to the experimental result, and the calculation formula is simple.