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对9根不同长细比和6根不同偏心距的玻璃纤维增强(GFRP)套管钢筋混凝土组合柱进行试验研究。试验结果显示:偏心距和长细比对GFRP套管钢筋混凝土组合柱的力学性能有很大的影响。随着偏心距的增大,试件的破坏形态逐渐由压缩破坏向拉伸破坏转变;随长细比的增大,试件的破坏形态则由材料破坏向失稳破坏过渡。试件的极限承载力亦随偏心距和长细比的增大而降低,但降低的幅度变缓。在试验的基础上,对试验数据进行统计回归,得到GFRP套管钢筋混凝土组合柱的长细比折减系数和偏心距折减系数,进而得到轴压组合长柱及偏压柱的承载力计算公式。按建议的组合柱承载力计算公式计算的结果与前人文献中的试验结果吻合较好,说明本文建议的组合柱承载力公式有一定的实际意义。
Nine reinforced concrete columns (GFRP) reinforced concrete columns with different slenderness and six eccentricities were tested. The experimental results show that the eccentricity and slenderness ratio have a great influence on the mechanical properties of GFRP reinforced concrete composite columns. With the increase of eccentricity, the failure morphology of the specimen gradually changes from compression failure to tensile failure. As the slenderness ratio increases, the failure morphology of the specimen changes from material failure to destabilization. The ultimate bearing capacity of the specimens also decreases with the increase of eccentricity and slenderness ratio, but the decreasing extent decreases. On the basis of the experiment, statistical regression is made on the test data to get the slenderness reduction coefficient and eccentricity reduction coefficient of the GFRP reinforced concrete composite column, and then the bearing capacity of the long column and the biased column formula. According to the proposed formula for calculating bearing capacity of composite columns, the calculated results are in good agreement with the experimental results in previous literatures, which shows that the formula proposed in this paper has some practical significance.