Effect of Subtropical Natural Exposure on the Bond Behavior of FRP-Concrete Interface

被引：15
作者：
Guo, Xinyan [1 ]
Shu, Shenyunhao [1 ]
Wang, Yilin [1 ]
Huang, Peiyan [1 ,2 ]
Lin, Jiaxiang [3 ]
Guo, Yongchang [3 ]
机构：
[1] South China Univ Technol, Sch Civil Engn & Transportat, Guangzhou 510640, Peoples R China
[2] South China Univ Technol, State Key Lab Subtrop Bldg Sci, Guangzhou 510640, Peoples R China
[3] Guangdong Univ Technol, Sch Civil & Transportat Engn, Guangzhou 510006, Peoples R China
来源：
POLYMERS | 2020年 / 12卷 / 04期
基金：
中国国家自然科学基金;
关键词：
fiber reinforced polymer (FRP); bond; natural exposure; reinforced concrete (RC) beam; FIBER-REINFORCED POLYMER; STRESS-SLIP MODEL; DURABILITY; CFRP; MOISTURE; STRENGTH; FATIGUE; SYSTEMS; SHEETS; JOINTS;
D O I：
10.3390/polym12040967
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
Subtropical natural exposure may significantly affect the bonding behavior of fiber reinforced polymer (FRP) externally bonded to concrete. To study the effect of subtropical natural climates on the FRP-concrete interface, natural exposure tests and an analytical approach were carried out on specimens externally bonded with carbon fiber reinforced polymer (CFRP) and basalt fiber reinforced polymer (BFRP). The bilinear bond stress-slip relationships for different exposure periods were derived from the experimental results of the strengthened reinforced concrete (RC) beams. Based on these bond-slip relationships, the full-range behavior of shear stress along the bond length and debonding load can be obtained through the analytical solution. The testing and numerical results showed that subtropical natural exposure can greatly affect the bond behavior of CFRP-concrete and BFRP-concrete interfaces in the early exposure period. In the late exposure period, the bond behavior was basically stable. With the increase of exposure time, the position of maximum shear stress tended to move backward, which indicated that the behavior of the FRP-concrete interface was weakened by natural exposure. Compared to the CFRP-concrete interface, subtropical natural exposure has greater influence on the bond behavior of the BFRP-concrete interface.
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页数：21
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