| Title |
Prediction of Structural Behavior of FRP Rebar Reinforced Concrete Slab based on the Definition of Limit State |
| Authors |
오홍섭(Oh, Hongseob) ; 김영환(Kim, Younghwan) ; 장낙섭(Jang, Naksup) |
| DOI |
https://doi.org/10.12652/Ksce.2020.40.4.0371 |
| Keywords |
설계코드;파괴모드;한계상태;사용성 Design code;Failure mode;FRP;Limit state;Serviceability |
| Abstract |
The failure mode of concrete reinforced with FRP is defined as the concrete crushing and the fiber rupture and the definition of limit state is a slightly different according to the design methods. It is relatively difficult to predict of FRP reinforced concrete because the mechanical properties of fibers are quite depending on its of fibers. The design code by ACI440 committee, which has been developed mainly on GFRP having low modulus of elasticity, is widely used, but the applicability on other FRPs of this code has not been sufficiently verified. In addition, the ultimate and serviceability limit state based on the ACI440 are comparatively difficult to predict the behavior of member with the 0.8~1.2 𝜌b because crushing and rupturing failure can be occurred simultaneously is in this region of reinforcement ratio, and predicted deflection is too sensitive according to the loading condition. Therefore, in this study, reliability and convenience of the prediction of structural performance by design methods such as ACI440 and MC90 concept, respectively, were examined through the experimental results and literature review of the beam and slab with the reinforcement ratio of 0.8 ~ 1.4. As a result of the analysis, it can be applied to the FRP reinforced structure in the case of the simple moment-curvature formula (LIM-MC) of Model Code, and the limit state design method based on the EC2 is more reliable than the ultimate strength design method. |