二次受力下CFRP加固钢筋混凝土梁抗剪性能

Shear capacity of RC beams strengthened by CFRP under quadratic loading

为研究CFRP加固有损伤梁的抗剪性能,基于钢筋混凝土梁抗剪理论,运用有限元分析软件建立CFRP加固有损伤梁的三维有限元模型;采用数值模拟计算方法,分析不同加固量和加固方式对二次受力下CFRP加固钢筋混凝土梁的抗剪极限承载力的贡献和加固效果的影响.研究结果表明:随着碳纤维布加固量的增多,梁的抗剪极限承载力也随之增大,且环包加固效果好于"U"形粘贴,碳纤维布在钢筋混凝土梁抗剪加固中对提高梁的极限承载力贡献较大.

To study the shear behavior of damaged beams strengthened with CFRP, based on the theory of shear capacity of reinforced concrete beam, this paper established a three-dimensional finite element model for damaged beams strengthened with CFRP by using finite element analysis software. Numerical simulation method was used to resolve different amount of reinforcement and reinforcement methods on the shear contribution of RC beams strengthened by CFRP under quadratic loading and the influence of reinforcement effect. The result of comparing simulation results with the calculated value from the formula in existing literature shows that with the increase of the amount of carbon fiber reinforced, the ultimate bearing capacity of beam shear also increases, and ring package is better than U paste reinforcement effect; carbon fiber cloth in the reinforced concrete beam shear reinforcement contribution is more important.