|
Title |
Evaluation of In-plane Shear Strength of CFRP Rebar-Concrete Member Using Modified Compression Field Theory
|
|
Authors |
강수태(Su-Tae Kang) ; 양은익(Eun-Ik Yang) ; 최명성(Myung-Sung Choi) |
|
DOI |
https://doi.org/10.11112/jksmi.2024.28.4.13 |
|
Keywords |
면내전단; 탄소섬유; 탄소보강근; 전단강도; 수정압축장이론 In-plane shear; Carbon fiber; CFRP rebar; Shear strength; Modified compression field theory |
|
Abstract |
In this study, when subjected to in-plane shear such as a shear wall, the behavior characteristics of a concrete member using CFRP rebars were investigated when the longitudinal reinforcement ratio was kept constant at 2.96% and the transverse reinforcement ratio was changed from 0.30 to 2.98%. The evaluation was conducted based on MCFT theory and analyzed by comparison with the case of concrete members using steel rebars. When the reinforcement ratio ranged from 0.30 to 1.19%, concrete members employing CFRP rebars exhibited higher shear strength compared to those using steel rebars. In contrast, at high reinforcement ratios of 1.79 and 2.98%, it was observed that the shear strength of the member with CFRP rebar was lower compared to the member with steel rebar. Maximum shear strain was observed to be higher for members reinforced with steel rebars at lower reinforcing bar ratios, while for ratios of 0.97% and above, CFRP rebars resulted in higher maximum shear strain. As the reinforcement ratio increases, the use of CFRP rebar instead of steel rebar results in a greater increase in maximum shear strain. By analyzing the difference in strain in the reinforcing bar as well as the difference in principal strain in the element caused by differences in the mechanical properties of the steel rebar and CFRP rebar, the shear strength and shear strain when using steel rebar and CFRP rebar with different reinforcement ratios can be compared and analyzed.
|