偏心距对CFRP条带约束混凝土柱力学性能影响分析

Effect of Eccentricity on Mechanical Properties of CFRP Strips Constrained Concrete Columns

为探究加载点偏心距对CFRP条带约束钢筋混凝土柱受压性能的影响,利用仿真模拟软件建立偏心距分别为0、25、50、75 mm的构件,进行有限元分析.在验证有限元模型合理性的基础上,考虑CFRP条带层数、宽度、间距等因素,进行CFRP条带约束钢筋混凝土柱受压性能模拟分析.研究结果表明:随着偏心距的增大,组合柱截面受拉区高度逐渐增加,构件的荷载-位移曲线变化趋势呈负相关趋势;不同约束程度的构件受偏心距的影响程度不同,当CFRP条带约束程度较强时,偏心受压状态下其极限承载力相较于约束程度较低时有下降趋势.

In order to explore the effect of eccentricity of loading point on the compression performance of reinforced concrete columns with CFRP strips confinement,the components with eccentricity of 0,25,50 and 75 mm were established by simulation software,and the finite element analysis was carried out.The compression performance of reinforced concrete columns restrained by CFRP strips was simulated and analyzed on the basis of verifying the rationality of the finite element model with the consideration of the number of layers,width and spacing of CFRP strips.The results show that with the increase of eccentricity,the height of tension zone of composite column section increased gradually,and the change trend of load-displacement curve of members was negatively correlated.The effect of eccentricity on members with different degree of constraint was different.When the degree of constraint of CFRP strips was strong,the ultimate bearing capacity of CFRP strips under eccentric compression tended to decrease compared with that under low constraint.