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ZJUS-A
Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering)  2006, Vol. 7 Issue (3): 436-444    DOI: 10.1631/jzus.2006.A0436
Mechanical & Civil Engineering     
Behavior of preloaded RC beams strengthened with CFRP laminates
Zhang Ai-hui, Jin Wei-liang, Li Gui-bing
Department of Civil Engineering, Zhejiang University, Hangzhou 310027, China
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Abstract  Eighteen reinforced concrete beams, including 16 beams strengthened with CFRP laminate at different levels of preload and 2 control beams, were tested to investigate the influence of preload level on flexural behavior of CFRP-strengthened RC beam. The experimental parameters include rebar ratios, number of plies of CFRP laminates and preload level at the time of strengthening. Theoretical analysis was also carried out to explain the experimental phenomena and results. The experimental and theoretical results indicated that the preload level has more influence on the stiffness and deflection of the strengthened beam, both at post-cracking and post-yielding stage, than that on the yielding and ultimate flexural strength of the strengthened beam. The main failure mode of CFRP-strengthened beam is the intermediate crack-induced debonding of CFRP laminates, provided that the development length of CFRP laminates and shear capacity of the beam are sufficient.

Key words： Beam      Strengthen      CFRP      Flexural behavior      Preload level     
Received: 20 May 2005     
CLC:  TU375.1  
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Zhang Ai-hui
Jin Wei-liang
Li Gui-bing
Cite this article:

Zhang Ai-hui, Jin Wei-liang, Li Gui-bing. Behavior of preloaded RC beams strengthened with CFRP laminates. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2006, 7(3): 436-444.

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http://www.zjujournals.com/xueshu/zjus-a/10.1631/jzus.2006.A0436     OR     http://www.zjujournals.com/xueshu/zjus-a/Y2006/V7/I3/436

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