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Journal of Zhejiang University SCIENCE A 2009 Vol.10 No.5 P.635-644


Strengthening an in-service reinforcement concrete bridge with prestressed CFRP bars

Author(s):  Hai-long WANG, Wei-liang JIN, David J. CLELAND, Ai-hui ZHANG

Affiliation(s):  Department of Civil Engineering, Zhejiang University, Hangzhou 310027, China; more

Corresponding email(s):   hlwang@zju.edu.cn

Key Words:  Carbon fiber reinforced polymer (CFRP) bar, Reinforced concrete (RC) bridge, Strengthening, Construction procedure, Field test, T-shaped beam

Hai-long WANG, Wei-liang JIN, David J. CLELAND, Ai-hui ZHANG. Strengthening an in-service reinforcement concrete bridge with prestressed CFRP bars[J]. Journal of Zhejiang University Science A, 2009, 10(5): 635-644.

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author="Hai-long WANG, Wei-liang JIN, David J. CLELAND, Ai-hui ZHANG",
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publisher="Zhejiang University Press & Springer",

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%T Strengthening an in-service reinforcement concrete bridge with prestressed CFRP bars
%A Hai-long WANG
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%A Ai-hui ZHANG
%J Journal of Zhejiang University SCIENCE A
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%D 2009
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.A0820836

T1 - Strengthening an in-service reinforcement concrete bridge with prestressed CFRP bars
A1 - Hai-long WANG
A1 - Wei-liang JIN
A1 - David J. CLELAND
A1 - Ai-hui ZHANG
J0 - Journal of Zhejiang University Science A
VL - 10
IS - 5
SP - 635
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%@ 1673-565X
Y1 - 2009
PB - Zhejiang University Press & Springer
ER -
DOI - 10.1631/jzus.A0820836

carbon fiber reinforced polymer (CFRP) bars were prestressed for the structural strengthening of 8 T-shaped reinforced concrete (RC) beams of a 21-year-old bridge in China. The ultimate bearing capacity of the existing bridge after retrofit was discussed on the basis of concrete structures theory. The flexural strengths of RC beams strengthened with CFRP bars were controlled by the failure of concrete in compression and a prestressing method was applied in the retrofit. The field construction processes of strengthening with CFRP bars—including grouting cracks, cutting groove, grouting epoxy and embedding CFRP bars, surface treating, banding with the U-type CFRP sheets, releasing external prestressed steel tendons—were introduced in detail. In order to evaluate the effectiveness of this strengthening method, field tests using vehicles as live load were applied before and after the retrofit. The test results of deflection and concrete strain of the t-shaped beams with and without strengthening show that the capacity of the repaired bridge, including the bending strength and stiffness, is enhanced. The measurements of crack width also indicate that this strengthening method can enhance the durability of bridges. Therefore, the proposed strengthening technology is feasible and effective.

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article


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