GFRP管劲性钢筋混凝土组合柱轴心抗压承载力计算

Calculation on bearing capacity of GFRP tube filled with steel-reinforced concrete composite column subjected to axial loading

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。

According to the experimental research of 8 composite columns,the major factors of affecting the bearing capacity of GFRP tube filled with steel-reinforced concrete composite column subjected to axial loading were analyzed.The test results show that the bearing capacity of composite column is enhanced with the increase of GFRP tube wall thickness.Besides,the inside shaped steels restrain the concrete and carry the definite loads with reinforcing steel bars so as to increase the bearing capacity of composite column.Based on the limit equilibrium method and the unified theory,the calculation formulae of the bearing capacity of GFRP tube composite column filled with steel-reinforced concrete and reinforced concrete subjected to axial loading were respectively created.Moreover,the calculated results agreed well with the experimental ones.The results from the unified theory were closer to the experimental ones,and the calculation formulae were simple.