Volume 10, Number 4 (December 2012)                   IJCE 2012, 10(4): 291-300 | Back to browse issues page

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Kabir M Z, Hojatkashani A. Experimental examination of CFRP strengthened RC beams under high cycle fatigue loading. IJCE. 2012; 10 (4) :291-300
URL: http://ijce.iust.ac.ir/article-1-665-en.html

Abstract:   (6031 Views)

The aim of current study is to investigate the effect of Carbon Fiber Reinforced Polymer (CFRP) composites on the fatigue

response of reinforced concrete beams. 6 reinforced concrete (RC) beams from which 3 were retrofitted with CFRP sheets, were

prepared and subjected to fatigue load cycles. To predict and trace the failure occurrence and its growth, a small notch was

induced at the middle span in bottom surface of all RC specimens. At the certain points, strains in concrete and CFRP were

measured in each cycle. The upper limit of applied load was considered at the level of design service load of bridges. In addition,

strain measurements facilitated to the calculation of interfacial shear stresses between concrete substrate and the CFRP layer.

The variation of such stresses through load cycles has been presented and discussed. Also, a discussion on possibility of the local

debonding phenomenon resulted from such interfacial stresses was presented. Load–deflection curves, strain responses and

propagation of tensile cracks provided an insight on the performance of the CFRP strengthened beams subjected to different

cycles of fatigue loading. Variation of load-deflection curves through fatigue load cycles depicted stiffness degradation which

was discussed in the research.

Full-Text [PDF 631 kb]   (2035 Downloads)    
Type of Study: Research Paper | Subject: Structure- Concrete

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