Scale effects on reinforced concrete beams strengthened for shear with discrete externally bonded carbon fiber-reinforced polymer U-wraps Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/n009w557j

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  • Current ACI design provisions for shear in reinforced concrete (RC) beams strengthened with externally bonded carbon fiber-reinforced polymer (CFRP) U-wraps may not adequately account for the effect of scale. This paper describes tests of 6 geometrically scaled beams to identify possible scale effects of such beams. Results indicated that effective depth (d), shear span-to-depth ratio (a/d), flexural-tension steel reinforcement ratio (ρs), transverse steel reinforcement ratio (ρv), FRP reinforcement ratio (ρf), FRP strip width (wf) and U-wrap orientation may affect the shear capacity of scaled specimens. In addition, local strain variations in surface bonded CFRP are investigated and recommendations on how to quantify CFRP strain are provided.
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