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RC部材의 휨보강용 炭素纖維쉬트의 部分減少係數 算定을 위한 變數 硏究
유영찬(You. Young-Chan),최기선(Choi. Ki-Sun),김긍환(Kim. Keung-Hwan) 대한건축학회 2004 大韓建築學會論文集 : 構造系 Vol.20 No.7
In recent years, Carbon fiber sheet(CFS) which has advantages of high strength, lightness and high durability has been<br/> developed and widely used. In the strength design approach, the design flexural strength of a RC member strengthened<br/> with CFS must exceed its required strength. Design flexural strength refers to the nominal strength of a member<br/> multiplied by strength reduction factor, but the additional strength reduction factor must be applied to the flexural<br/> contribution of CFS to account for lower reliability of FRP reinforcement, as compared with internal steel reinforcement.<br/> According to the previous researches, strength reduction factor of 2/3 or 0.7 for the CFS is suggested by JCI design<br/> guideline and AIK technical reports, respectively.<br/> This study investigated 284 specimens and analyzed 57 specimens whose final failure was governed by the rupture of<br/> CFS among them. Each specimen was grouped in terms of CFS ply, sheet thickness, end anchorage, loading type, specimen<br/> scale, etc. From the analysis, it was found that total thickness of CFS expressed by the number of CFS ply was the most<br/> governing factor in determining the partial strength reduction factor. And the existing partial reduction factor of JCI<br/> recommendation or AIK reports is unconservative in case of being strengthened with more than 3 plies of CFS.