钢结构在运行一段时间后，其母材或焊缝附近易产生裂纹，因此需要对裂纹进行修复以延长使用寿命． 文中研究了碳纤维增强复合材料( CFRP) 加固裂纹钢板的疲劳寿命及加固参数． 首先采用粘结力理论，建立CFRP 加固裂纹钢板的有限元模型，计算得到裂纹尖端的应力强度因子; 然后进行4 组对比疲劳试验，利用试验数据和Paris 公式计算材料常数C 和n，将计算的应力强度因子代入Paris 公式预测试件的疲劳寿命; 最后利用有限元模型对CFRP 加固的刚度、长度、宽度等加固参数进行了研究． 结果表明: 根据有限元模型计算的应力强度因子幅和Paris 公式可以准确预测CFRP 加固裂纹钢板的疲劳寿命; CFＲP 加固可以减小裂纹尖端的应力强度因子，有效提高裂纹钢板的疲劳寿命．

After a period of operation,cracks may occur in the material or welding seam of steel structures,so that some repair measures should be adopted to prolong the lifetime of the structure.This paper deals with the fatigue lifetime and reinforcement parameters of cracked steel plates strengthened by carbon fiber-reinforced polymer ( CFRP) .In the investigation,first,a finite element model of the cracked plate strengthened by CFRP is established based on the cohesive force theory,with which the stress intensity factor of the crack is calculated.Then,four groups of fatigue testsare carried out.According to the test data and the Paris formula，the material constants C and n are calculated.Moreover,the calculated stress intensity factor is put in the Paris formula to predict the fatigue lifetime of the specimen.Finally,the stiffness,length and width of CFRP are studied by using the finite element model.The results demonstrate that the stress intensity factor calculated by the finite element model and the Paris formula helps to accurately predict the fatigue lifetime of the cracked plate strengthened by CFRP,and that CFRP is effective in decreasing the stress intensity factor of the crack edge and prolonging the lifetime of steel plates.