偏心距对CFRP布加固钢筋混凝土L形柱力学性能的影响

Effect of eccentricity on mechanical properties of reinforced concrete L-shaped columns strengthened with CFRP cloth

为提高钢筋混凝土L形柱的力学性能,利用ABAQUS有限元软件建立碳纤维增强复合材料(CFRP)加固钢筋混凝土L形柱模型,通过L形柱的荷载-挠度曲线和承载力分析验证模型的有效性。设计不同偏心距的模型构件,模拟分析CFRP布加固钢筋混凝土L形柱的力学性能。结果表明,在偏心荷载作用下,近荷载柱肢混凝土和远离荷载柱肢混凝土的最大等效应力分别出现在柱子的中上部和最底部。随着偏心距的增大,加固前后试件的极限承载力均逐渐降低,CFRP布加固的钢筋混凝土L形柱的延性和承载力提升幅度增加,加固效果显著。该研究为CFRP布加固钢筋混凝土L形柱提供了参考。

This paper highlights an effort to improve the mechanical properties of reinforced concrete L-shaped columns. The research involves developing the reinforced concrete L-shaped column model strengthened with carbon fiber reinforced polymer（ CFRP） using ABAQUS finite element software; performing the load-deflection curve and bearing capacity analysis of L-shaped columns to verify the validity of the model; and simulating and analyzing the mechanical properties of reinforced concrete L-shaped columns strengthened with CFRP cloth by designing the model members with different eccentricity. The results demonstrate that under eccentric loading,the concrete near loaded column limb and the concrete far away from the load column limb experience the maximum equivalent stress at the middle and bottom of the column respectively; and an increase in eccentricity is accompanied by a gradual decrease in the ultimate bearing capacity of specimens before and after reinforcement,an increase in the ductility and bearing capacity of reinforced concrete L-shaped columns strengthened with CFRP cloth,and thus a remarkable reinforcement effect. This study may provide a reference for an insight into L reinforced concrete columns with CFRP reinforcement.