Engineering Mechanics Institute Conference 2013

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Experimental study of fatigue performance of Reinforced Concrete Beams Strengthened

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Hui Pei
Changsha University of Science & Technology
China

Shouping Shang
Hunan University
China

Jianren Zhang
Changsha University of Science & Technology
China

Yang Liu
Changsha University of Science & Technology
China

C.S. Cai
Louisiana State University
United States

Abstract:
Fiber reinforced polymers (FRPs) have commonly been used for bridge retrofitting and strengthening, especially in the strengthening of flexural members of bridges. Considerable research has been conducted to investigate the static behavior of reinforced concrete (RC) beams strengthened with externally bonded FRP laminates, initially using non-prestressed FRPs and more recently using prestressed FRPs. However, the research on the fatigue behavior of beams with either non-prestressed or prestressed FRPs is not adequate. In this paper, seven RC beams including two regular ones and five beams strengthened with externally bonded non-prestressed and prestressed CFRP plates were studied. The static and fatigue tests for the beams were conducted to examine the different strengthening methods on the fatigue performance of beams. Furthermore, the effect of debonding on the fatigue behavior of the strengthened beams was also investigated. It is evident from the experimental results that the monotonic and fatigue performance of reinforced concrete beams were significantly enhanced by strengthening with prestressed CFRP plates. The prestressed CFRP plates obviously reduced the deflection and reinforcing bar stress of the beams. Test results showed that under similar loads, the strain range and maximum strain of the reinforcing bars of beams with prestressed CFRP plates were significantly less than those of beams with non-prestressed CFRP plates. Moreover, debonding between the CFRP plate and concrete was observed during the fatigue test and resulted in stress redistributions of the CFRP plate and reinforcing bars.

 

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