GFRP管混凝土长柱轴压极限承载力研究

Research on the bearing capacity of long GFRP-reinforced concrete composite columns subjected to axial compression

为了得到GFRP管混凝土组合长柱的轴压极限承载力计算方法,在对组合长柱的破坏特征进行分析的基础上,分别采用了钢管混凝土柱承载力计算模型和欧拉公式对GFRP套管长柱的承载力进行了探讨;总结了现有的GFRP混凝土组合短柱极限承载力的计算方法,并根据长柱的特点,引入了组合长柱承载力的稳定系数,通过对已有的组合长柱的承载力试验数据进行拟合分析,得到稳定系数与构件长径比间的线性关系,以此得到计算GFRP管混凝土长柱承载力的稳定系数法;最后通过试验比较了各方法的相对误差,其中采用稳定系数法计算的结果最为理想.

Based on the analysis of the failure characteristics of long GFRP-reinforced concrete composite columns, the bearing capacity is discussed using the computational model for the bearing capacity of concrete filled steel tubular columns and the Euler formula, respectively, to present the computational method for the bearing capacity of long GFRP-reinforced concrete composite columns. The existing computational methods for the bearing capacity of short GFRP- reinforced concrete composite columns are summarized. According to the characteristics of long columns, a stability coefficient is introduced into the bearing capacity of long composite columns. Through regression analyses of the existing experimental data on the bearing capacity of long composite columns, a linear relationship between the stability coefficient and the column slenderness ratio is obtained. A stability coefficient formula is derived to calculate the bearing capacity of long GFRP-reinforced concrete composite columns. Finally, the relative errors given by various methods are compared, which indicates that the stability coefficient formula agrees best with test data.