FRP 보강근의 표면이형에 따른 기본정착길이 산정
Evaluation of FRP Basic Development Length according to Surface Deformations
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초록
FRP보강근을 사용함에 있어 부착강도는 가장 중요한 요소 중 하나이다. ACI440.1R-03에 따르면 부착성능에 영향을 미치는 보강근 인장강도, 지름, 콘크리트 압축강도, 피복두께, 횡보강근의 유무, 철근의 위치 등에 대한 보정값들이 제시되어 있었다. 따라서 본 연구에서는 이러한 현상이 부착성능에 영향을 미치는 점착력, 마찰력, 지압력이 표면형태에 따라 기본정착길이를 산정하고자 진행하였으며, 그 결과 FRP 보강근의 정착길이에 영향을 미칠 수 있는 표면이형의 효과는 원형, 이형, 나선형, 모래분사형 순으로 기본정착길이의 감소로 나타났다.
Abstract
The purpose of this study was to suggest Basic Development Length according to FRP Surface Deformation. In ACI440.1R-03, there was no consideration about FRP Surface Deformation. It can cause inefficiency and unstability. This study used the basic equation of ACI318M-08 Because it contains basic mechanism of bond performance. And it contains K factor classified with Surface Deformations and Test types. Evaluating the K-factor regression analysis was carried out. Analysis result was as follows: Pull-out Test shows higher bond strength than beam-end Test. Also, bond strength of sand-coated type was higher than that of any other Surface Deformation types. By using suggested equation in this study, more accurate Basic Development Length can be evaluated.
참고문헌 (5)
- "ACI440.1R-03, Guide for the Design and Construction of Concrete Reinforced with FRP Bars", American Concrete Institute, ~ (2003)
- "ACI318M-08, Building Code Requirements for Structural Concrete", American Concrete Institute, ~ (2008)
- "ACI408R-03, Bond and Development of straight Reinforcing Bars in Tension", American Concrete Institute, ~ (2003)
- Cosenza, E, "Behavior and Modeling of bond of FRP Rebars to Concrete", Journal of Composites for construction, 1(2), pp.40~51 (1997)
- Tighiouart, B., "Inveatigation of Bond in Concrete Member with FRP Bars", Construction and Building Materials, 12(8), pp.453~462 (1998)