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Title |
Theoretical Analysis for Strengthening Effects of RC Beam with Reinforced FRP Sheet
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DOI |
https://doi.org/10.11112/jksmi.2018.22.4.100 |
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Keywords |
탄소섬유 ; 유리섬유 ; PET 섬유 ; 기준실험체 ; 항복 단면 ; 극한 단면 ; 모멘트-곡률 곡선 ; 보강효과 Carbon fiber ; Glass fiber ; PET(polyethylene terephthalate) ; standard specimen ; elastic cross section ; ultimate cross section ; moment-curvature curve ; strengthening effect |
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Abstract |
The objective of this study is to assess the strengthening effects of fiber reinforced polymer(FRP) sheets such as Carbon fiber, Glass fiber, and PET(polyethylene terephthalate) on reinforced concrete flexural members. Variables of theoretical analysis are types of strengthening materials, material properties and amount of strengthening materials. A virtual flexural member without FRP sheets was created as a control specimen to understand the structural behavior of the non-strengthened specimen in terms of elastic and ultimate cross section. In total, 11 specimens including one non-strengthened and ten strengthened specimens were investigated. Various variables such as types of strengthening, strengthening properties, and amount of strengthening were studied to compare the behavior of the control specimen with those of strengthened specimens with regard to moment-curvature relationship. Results of theoretical analysis showed that the moment capacity of strengthened specimens was superior to that of the control specimen. However, the control specimen indicated the best ductility among all the specimens. As the amount of strengthening increased, flexural performance was improved. Furthermore, the results indicated that the ductile effect of members was affected by the ultimate strain of FRP sheets. The strengthening effect on the damaged member was similar to that on the non-damaged one since there was less than 10% difference in terms of flexural strength and ductility. Therefore, even if a damaged member is treated as non-damaged for analysis there is probably no noticeable difference.
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