应用扩展有限元法(Extended Finite Element Method,XFEM)建立了碳纤维增强复合材料(Carbon Fiber Reinforced Polymer,CFRP)加固H型钢梁的有限元模型。用CFRP布加固无损伤H型钢梁试验结果进行了比较分析和胶层损伤开裂模型的参数验证,然后,应用该方法系统分析了CFRP布加固有损伤H型钢梁胶层界面的应力分布和开裂损伤情况,并进行了参数的比较分析。分析结果表明,扩展有限元法在CFRP加固带损伤H型钢梁问题方面具有较好的精度,其避免了网格重剖分的问题,也可以模拟出裂纹扩展的路径。最后,在此模型基础上,研究了CFRP布有效粘结长度和胶层界面应力等参数的变化规律。 A finite element model of H-Beam strengthened with Carbon Fiber Reinforced Polymer (CFRP) was established by Extended Finite Element Method (XFEM). The comparison of the test results of the H-beam with CFRP sheets strengthened and the parameters of the plastic layer damage cracking model were carried out. Then the stress distribution of the interface of the H-beam reinforced with CFRP sheets and the damage of H- Cracking damage, and carried out a comparative analysis of parameters. The analysis results show that the extended finite element method has better accuracy in the problem of H beam damage with CFRP reinforcement strip, which avoids the problem of mesh re-division and can also simulate the crack propagation path. Finally, on the basis of this model, the changing rules of the effective bonding length of CFRP cloth and the interface stress of the adhesive layer were studied.