Size Effect on Flexural Properties of Simple Supported Beam Near-surface Mounted CFRP Laminate

WANG Xing-guo; ZHENG Dan-dan; ZHU Kun-jia; LI Li

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Journal of Railway Engineering Society ›› 2014, Vol. 31 ›› Issue (3) : 72-75.

Size Effect on Flexural Properties of Simple Supported Beam Near-surface Mounted CFRP Laminate

WANG Xing-guo，ZHENG Dan-dan，ZHU Kun-jia，LI Li

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Abstract

Research purposes：For the shortcomings of external bonding carbon fiber reinforced polymer(CFRP)laminate reinforced concrete beam，such as easy debonding，in this article first slot in the surface layer concrete beam and stick embedded CFRP strip，and then Carry out the flexural properties test of monotonic loading．Effect of different size of RC bridge beams(scale model beam size to prototype beam size ratio is 1/2)on typical load，distribution and spacing of cracks，strain of FRP laminate and steel bar is analyzed．

Research conclusions：Results show that：(1)Beam size impacts on the embedded strengthening effect，especially on performance of the concrete beam after reinforcement under sustained load．(2)Deflection ratio is close to geometric similarity coefficient for scale model and prototype beams under the same load．(3)Under sustained loading，the concrete embedded CFRP sheets have good reinforcement effect，bearing capacity is improved less than the strengthened beam without initial load，and the improved value is nonlinear relationship with geometric similarity coefficient．Crack spacing of model beam is relatively larger after reinforcement，and it should be paid attention to in design．(4)The results can be references for the bridge reinforcement study and application．

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RC beam bridge / near-surface mounted(NSM) / CFRP laminates / size effect

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WANG Xing-guo, ZHENG Dan-dan, ZHU Kun-jia, et al. Size Effect on Flexural Properties of Simple Supported Beam Near-surface Mounted CFRP Laminate[J]. Journal of Railway Engineering Society, 2014, 31(3): 72-75

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