온도상승에 따른 탄소섬유시트 보강 콘크리트보의 계면응력
The Interfacial Stresses in Concrete Beam Strengthened with Carbon Fiber Sheets due to Temperature Rising
0
조회
0
다운로드
0
인용
0
참고문헌
키워드
초록
Carbon fiber reinforced polymer(CFRP) can be bonded to the soffit of a concrete beam as a means of repairing and strengthening the beam. In such beams, materials, concrete and carbon fiber sheets, are different in coefficient of thermal expansion. Consequently, interfacial shear stresses can be increased and debonding failure may occur at the plate ends due to temperature rising. This paper presents a method of approximate closed-form solutions for the interfacial shear stresses and conducts a beam test to compare the numerical results. In case of temperature rising over 30℃, interfacial stress of 0.91MPa is occurred at the end of sheet. Therefore, using carbon fiber sheet for strengthening the concrete beam, it is necessary to consider the thermal effects and to evaluate the long time behavior of the concrete beam by temperature change.
Abstract
Carbon fiber reinforced polymer(CFRP) can be bonded to the soffit of a concrete beam as a means of repairing and strengthening the beam. In such beams, materials, concrete and carbon fiber sheets, are different in coefficient of thermal expansion. Consequently, interfacial shear stresses can be increased and debonding failure may occur at the plate ends due to temperature rising. This paper presents a method of approximate closed-form solutions for the interfacial shear stresses and conducts a beam test to compare the numerical results. In case of temperature rising over 30℃, interfacial stress of 0.91MPa is occurred at the end of sheet. Therefore, using carbon fiber sheet for strengthening the concrete beam, it is necessary to consider the thermal effects and to evaluate the long time behavior of the concrete beam by temperature change.
참고문헌 (22)
- 김성도, "구조공학실험", pp.24~30 (2001), 구미서관
- 변동균, "철근 콘크리트", pp.26~ (2002), 동명사
- 심종성, "FRP로 보강된 철근 콘크리트 구조물", pp.44~56 (2006), 청문사
- 양동석, "탄소섬유판으로 부착보강된 철근콘크리트 부재의 계면 부착거동", 대한토목학회 논문집A, 27(3A), pp.443~452 (2007), 대한토목학회
- 조홍동, "CFRP로 보강된 콘크리트 보의 온도 변화에 따른 영향 분석", 한국안전학회지, 18(2), pp.79~85 (2003), 한국안전학회
- 최기선, "FRP 복합체의 동결 융해 및 고온·고습 저항성에 관한 실험연구", 한국콘크 리트학회 학술발표회 논문집, 18(1), pp.345~348 (2006)
- 한국도로교통협회, "도로교설계기준", pp.22~23 (2005), 건설정보사
- 황의승, "철근콘크리트 라멘교의 온도 분포 측정", 대한토목학회 학술발표회, pp.111~114 (2002)
- 황태경, "온도 상승에 따른 탄소 복합재의 굽힘 강도 저하 평가", Advanced Composite Materials, 18(2), pp.20~29 (2005), 한국복합재료학회
- Baumert, M. E., "A Review of the Low Temperature Response of Reinforced Concrete Beams Strengthened with FRP Sheets", Advanced Composite Materials in Bridges and Structures, The Second ACMBS International Conference, pp.565~572 (1996)
- Clement J. L., "Durability of Composites for Construction", The International Conference on Durability of Fiber Reinforced Polymer Composites for Construction, pp.561~569 (1998)
- Del Mar Lopez, M., "Bending Behavior or Reinforced Concrete Beams Strengthened with Carbon Fiber Reinforced Laminates and Subjected to Freeze-Thaw Cycles", Fourth International Symposium of Fiber Reinforced Polymer Reinforcement for concrete Structures, ACI, pp.559~576 (1999)
- Hayes M D., "The Effect of Moisture on the fatigue Behavior of a Glass", Vinyle Ester Compos, 1998, pp.1, 1~13
- Kaiser, H., "Bewehren von Stahlbeton Mit Kohlenstoff- serverstarkten Expoxiharzen", 석사
- Karbhari, V. M., "Effect of Environmental Exposure on the External Strengthening of Concrete with Composites", 15(12), pp.1194~1217 (1996)
- Maalej, M., "Interfacial shear stress concentration in FRP-strengthened beams", pp.417~426 (2001), Composite Structures
- Malek AM., "Saadatmanesh H., Ehsani MR. Prediction of Failure Load of RC Beams Strengthened with FRP Plate due to Stress Concentration at the Plate End", pp.142~152 (1998), ACI Structural J.
- Myers, J.J., "Effect of Combined Environmental Cycles on the Bond of FRP Sheets to Concrete", pp.228~235 (2001), Composite in Construction
- Roberts TM., "Approximate Analysis of Shear and Normal Stress Concentrations in the Adhesive Layer of Plated RC Beams", The Structural Engineering, 67(12), pp.229~233 (1989)
- Smith, S. T., "Interfacial stresses in plated beams", Engineering Structures, 23, pp.857~871 (2001)
- Tim Stratford, "Elastic analysis of adhesion stresses for the design of a strengthening plated bonded to a beam", Construction and Building Materials, 20, pp.34~45 (2006)
- Tysl, S. R., "Effect of Surface Delamination on the Freeze-Thaw Durability of CFRP-Reinforced Concrete Beams", Durability of FRP Composites for Construction, The First Annual CDCC Conference, pp.317~324 (1998)