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Title |
An Experimental Study on Concrete Bond Behavior According to Grid Spacing of CFRP Grid Reinforcement
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Authors |
노치훈(Chi-Hoon Noh) ; 장낙섭(Nag-Seop Jang) ; 오홍섭(Hongseob Oh) |
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DOI |
https://doi.org/10.11112/jksmi.2022.26.6.73 |
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Keywords |
격자형 CFRP 보강재; 부착거동; 부착길이; 뽐힘시험 Bond behavior; Bond length; Grid typed CFRP; Pull-out test |
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Abstract |
Recently, as the service life of structures increased, the load-carrying capacity of deteriorated reinforced concrete, where corrosion of reinforcingbars occurs due to various causes, is frequently decreased. In order to address this problem, many studies on the bond characteristic of FRP (FiberReinforced Polymer) bars with corrosion resistance, light weight and high tensile strength have been conducted, however there are not many studieson the bond characteristic of grid-typed CFRP embedded in concrete. Therefore, in order to evaluate the bond characteristics of grid-typed CFRP andits usability as a substitute for steel rebar, a pull-out test is performed using the longitudinal bond length and transverse grid length of the grid-typedCFRP as variables. Through the pull-out test, the bond load-slip curve of the grid-typed CFRP is derived, and the bond behavior is analyzed. The totalbond load equation is proposed as the sum of the bond force of the longitudinal bond length and the shear force of the grid in the transverse direction. Also, expressing the area of the bond load-slip curve as total work, the change in dissipated energy with respect to the slip is analyzed to examine theeffect of the tranverse grid on the bond force.
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