碳纤维布加固局部强度不足混凝土柱轴压性能的有限元分析

FEM analysis on axial compression performance of concrete columns strengthened by CFRP for local insufficient strength

利用ABAQUS有限元软件分析了碳纤维布加固局部强度不足混凝土柱的受力性能。对加固前后不同区域混凝土的变形情况和应力-应变关系曲线、钢筋和箍筋的变形情况和应力-应变关系曲线以及混凝土柱整体的荷载-位移曲线做对比分析。研究结果表明,碳纤维布对加固区域混凝土可以产生明显的约束作用,增强混凝土柱整体抵抗变形的能力。对局部强度不足区域的混凝土裂缝发展有明显的抑制作用,可小幅度的提高混凝土柱的极限承载力。当碳纤维布层数超过3层时,增加层数仅对混凝土柱延性性能有影响,对其承载力的提高无明显作用。

Finite element software of ABAQUS was used to analyze the mechanical behavior of concrete columns strengthened by carbon fiber reinforced plastics for local insufficient strength. Comparison analyses were conducted on mechanical results of specimens before and after strengthening,including deformation condition and stress-strain relationship curve of the concrete,deformation condition and stress-strain relationship curve of the reinforcement and stirrup,and load-displacement curve of the overall concrete columns. The study results show that the CFRP can obviously restrain the concrete in the strengthened zone to strengthen the ability of the concrete column to resist the deformation.CFRP has obvious inhibiting effect on the development of concrete cracks in the area with local insufficient strength,and can improve the ultimate bearing capacity of concrete column. When the number of layers of CFRP is more than three,the increase of the number of layers only has no obvious effect on improvement of the ductility and bearing capacity of the concrete column.