关键词: 腐蚀;加固;疲劳性能;挠度计算

Abstract: 12 model beams by actual beams scale were used. According to the different corrosion rate,the beams were strengthened with externally prestressed steel strand,respectively to carry on the static load test and constant amplitude fatigue test in order to know the influence of external prestressing on the fatigue performance under different degree of corrosion. The results show that this reinforcement can improve the corrosion resistance of test beams and effectively prevent the occurrence of brittle fracture of the serious corroded beams,so that the fatigue life has been significantly improved;With the increasing degree of corrosion, the bearing capacity and flexural rigidity of beams increases;Through the introduction of the stiffness correction coefficient under corrosion and fatigue load,the formula of the mid-span deflection of the concrete beam is put forward,which provides a reference for the practical engineering application.

Key words: corrosion;reinforcement;fatigue performance;deflection calculation