我国南方大都处在亚热带地区，高温高湿环境会降低预应力 CFＲP 加固 ＲC 结 构的性能。为了探究湿热环境对预应力 CFＲP 加固 ＲC 结构耐久性的影响，文中依据湿 热环境和疲劳荷载共同作用下加固梁主筋失效和 CFＲP-混凝土界面脱粘剥离两种破坏模 式，分别建立了主筋失效和 CFＲP-混凝土界面脱粘剥离破坏准则，对湿热环境下预应力 CFＲP 加固 ＲC 梁的疲劳性能进行了数值分析。研究结果表明，湿热环境会降低加固梁 的疲劳性能，提高 CFＲP 的预应力度对梁预测寿命的影响呈现两种情况，当 ＲC 梁是因 主筋失效破坏时，预应力的增大可以显著提高 ＲC 梁预测寿命; 而当 ＲC 梁是因界面剥 离破坏时，过高的预应力度反而会降低 ＲC 梁的预测寿命。

Most parts of south China are located in subtropical region，where hygrothermal environment will reduce the performance of prestressed CFＲP reinforced ＲC structure． In order to explore the influence of hygrothermal environment on the fatigue performance of prestressed CFＲP reinforced ＲC structure，the failure criterions were established in the paper based on the two failure modes of main reinforcement fracture and debonding failure of CFＲPconcrete interface under the combined action of hygrothermal environment and fatigue load and the fatigue performance of prestressed CFＲP reinforced ＲC beams in hygrothermal environment was analyzed by numerical analysis． The results show that the fatigue performance of the reinforced beams will be reduced in hygrothermal environment， and the effect of increasing the prestress degree of CFＲP on the predicted life of the beams presents two circumstances． When the ＲC beams are damaged due to the failure of the main reinforcement，the increase of prestress degree can significantly increase the predicted life of the ＲC beams． However，when the beam is damaged due to the interface debonding，excessive prestress will reduce the life expectancy of ＲC beams．