CFS/AFS混杂加固RC梁非线性有限元分析

Nonlinear Finite Element Analysis of RC Beams Strengthened with CFS/AFS

针对碳/芳纶纤维布混杂加固钢筋混凝土梁的这种新型的加固方法,通过建立不同材料本构方程,对单层及双层加固模型进行了非线性有限元分析.分析了纤维布长度及加固形式对加固梁弯曲刚度、初裂载荷及极限载荷的影响,并将计算结果与试验结果进行了对比,发现非线性有限元计算结果与试验结果吻合较好,混杂加固具有良好的混杂效应,碳纤维布高强度的特点得到充分发挥.

This paper aims at the mechanical characteristics of the reinforced concrete （RC） beams strengthened with carbon fiber sheet/aramid fiber sheet （CFS/AFS）, a new hybrid strengthening method. In the investigation, the nonlinear finite element analyses of the single-layer and double-layer strengthening models for the RC beams are made by establishing the constitutive equations of different materials. Then, the effects of the fibre sheet type and the sheet length on the bending stiffness, initial cracking loads and failure loads of the beams are analyzed. Moreover, a comparative analysis is performed, finding that the calculated results are consistent with the experimental ones. It is indicated that the hybrid strengthening by using CFS and AFS may result in a good hybrid effect and may sufficiently bring the high strength of CFS into play.