侧贴碳纤维布加固连续梁非线性有限元分析

Nonlinear Finite Element Analysis of the Continuous Beams Side-bonded with CFRP Sheets

为研究不同初始荷载作用下侧贴碳纤维布及侧贴预应力碳纤维布加固钢筋混凝土连续梁的加固效果,采用有限元分析软件ABAQUS对其进行数值模拟,并将有限元分析结果与试验结果对比。有限元分析表明:钢筋混凝土连续梁的加固效果受初始荷载的影响,初始荷载越小,加固效果越好;对纵向侧贴碳纤维布施加预应力,能够大幅提高钢筋混凝土连续梁的抗弯承载力,与未加固梁相比其抗弯承载力提高了65%以上;有限元计算结果与试验结果的荷载-挠度曲线吻合较好,两者的抗弯承载力相差不超过10%。所得结果可以为类似加固设计和试验提供参考。

A finite element analysis is performed to study the effect of the reinforced concrete continuous beams strengthened with side-bonded CFRP sheets and side-bonded pre-stressed CFRP sheets under the initial load. The finite element analysis software ABAQUS is applied to numerical simulation and the results of the analysis are compared with experiment. The results show that the reinforcement effect of the reinforced beams side-bonded with CFRP sheets is influenced by the initial load, namely the smaller initial load, the better reinforcement effect; longitudinal pre-stressed reinforcement can significantly improve the flexural bearing capacity of concrete continuous beams, with the flexural bearing capacity increased by more than 65% compared with unreinforced beams. In addition, the finite element results of load-displacement curve have good agreement with the test, and the discrepancy is less than 10% for the flexural capacity. The results can provide reference for similar structure design and test.