An experimental study on fatigue debonding growth of RC beams strengthened with prestressed CFRP plates

被引：3
|
作者：
Min, Xinzhe [1 ]
Zhang, Jiwen [2 ]
Li, Xing [2 ]
Wang, Chao [3 ]
Tu, Yongming [2 ,3 ]
Sas, Gabriel [3 ,4 ]
Elfgren, Lennart [3 ]
机构：
[1] Nanjing Inst Technol, Sch Civil Engn & Architecture, Nanjing, Peoples R China
[2] Southeast Univ, Natl Engn Res Ctr Prestressing Technol, Key Lab Concrete & Prestressed concrete structures, Sch Civil Engn,Minist Educ, Nanjing 211189, Peoples R China
[3] Lulea Univ Technol, Dept Civil Environm & Nat Resources Engn, Div Struct & Fire Engn, SE-97187 Lulea, Sweden
[4] SINTEF Narvik AS, N-8517 Narvik, Norway
来源：
ENGINEERING STRUCTURES | 2022年 / 273卷
关键词：
Fiber reinforced polymer; Reinforced concrete; Prestress; Fatigue; Debonding; CONCRETE BEAMS; FRP; BEHAVIOR; PERFORMANCE; ANCHORAGE; RETROFIT; FAILURE; SYSTEMS; ROD;
D O I：
10.1016/j.engstruct.2022.115081
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
Externally bonded Fiber Reinforced Polymer (FRP) laminates are increasingly used to strengthen Reinforced Concrete (RC) members. However, FRP debonding remains a major drawback of this strengthening method. To better understand the mechanisms of FRP debonding, six RC beams strengthened with prestressed or nonprestressed Carbon Fiber Reinforced Polymer (CFRP) plates were subjected to static and fatigue loading. CFRP plate debonding was observed in both cases. However, the mechanism of debonding differed: under cyclical fatigue loading, debonding was initiated under both loading points simultaneously and propagated synchronously towards the nearest support whereas in static tests debonding began under a single loading point and progressed suddenly towards its adjacent support. The results also showed that stress redistribution induced coupling between accumulated fatigue damage in the steel reinforcement and fatigue debonding of the CFRP plate, accelerating the fatigue failure of the specimens.
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页数：11
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