Flexural Performance of Reinforced Concrete Beams Strengthened with Carbon Fiber-Reinforced Polymer(CFRP)under Hygrothermal Environment Considering the Influence of CFRP-Concrete Interface  

作　　者：Xinyan Guo Peiyan Huang Yilin Wang Shenyunhao Shu Xiaohong Zheng 

机构地区：[1]School of Civil Engineering and Transportation,South China University of Technology,Guangzhou 510640,China [2]State Key Laboratory of Subtropical Building Science,South China University of Technology,Guangzhou 510640,China

出　　处：《Acta Mechanica Solida Sinica》2021年第3期381-392,共12页固体力学学报（英文版）

基　　金：The authors would like to acknowledge the financial support from the National Natural Science Foundation of China(Nos.11872185,11627802,51678249,11132004);the Natural Science Foundation of Guangdong Province(No.2019A1515012222).

摘　　要：As an important component,the bond behavior of carbon fiber-reinforced polymer(CFRP)-concrete interface for a reinforced concrete(RC)beam is very significant.In this study,a theoretical model was established to analyze the flexural behavior of CFRP-strengthened RC beams,and the CFRP-concrete interfacial bond-slip relationship under hygrothermal environment was unified into one model.Two failure criteria corresponding to two types of failure modes,i.e.,concrete crushing and intermediate crack(IC)-induced debonding,were developed.Through the theoretical model,the flexural behavior of deflection,interfacial shear stress distribution and ultimate load of a CFRP-strengthened RC beam under hygrothermal environment were obtained and predicted.Moreover,the theoretical model was verified by test results.The results showed that the hygrothermal environment had a significant impact on the CFRP-concrete interface behavior.Compared with the control beam without hygrothermal environment pretreatment,the deflection and ultimate load of the strengthened RC beam decreased by 51.9%and 20%,respectively.

关 键 词：Carbon fiber-reinforced polymer(CFRP) CFRP-concrete interface Hygrothermal environment Failure mode Static behavior Reinforced concrete(RC)beam 

分 类 号：TU528[建筑科学—建筑技术科学]