湿热环境下预应力CFRP加固RC梁疲劳性能数值分析  

Numerical Analysis of Fatigue Performance of Prestressed CFRP Reinforced RC Beams in Hygrothermal Environments

作　　者：罗毅[1] 张翔 郭馨艳[1] LUO Yi;ZHANG Xiang;GUO Xinyan(School of Civil Engineering and Transportation,South China University of Technology,Guangzhou 510640,Guangdong,China)

机构地区：[1]华南理工大学土木与交通学院,广东广州510640

出　　处：《华南理工大学学报（自然科学版）》2021年第10期70-77,共8页Journal of South China University of Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(11872185)。

摘　　要：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 CFRP-concrete interface under the combined action of hygrothermal environment and fatigue load and the fatigue perfor-mance 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.

关 键 词：湿热环境 预应力CFRP 疲劳荷载 RC梁 数值分析 

分 类 号：TU375[建筑科学—结构工程]