매립형 GFRP 판으로 보강된 콘크리트 보의 전단강도식 평가 = Evaluation of Shear Strength Equation of Concrete Beams Embedded with GFRP Plates

다국어 초록 (Multilingual Abstract)

In this paper, we will study the possibility of the design standard applied by modifying the shear strength equation so that we can propose the shear strength equation of reinforced concrete beams strengthened with the new type of GFRP plate. The new GFRP shear reinforcement is manufactured into a plate shape with several openings to ensure perfect integration with concrete.
The test was performed on 6 specimens with shear span-to-depth ratio of 2.4. Test variables are the amount of the shear reinforcement and the shape of shear reinforcement. The two types of GFRP plate with different shapes are a rectangle and a parallelogram.
A shear strength equation for concrete beams with the proposed GFRP plate was suggested through modifying the existing shear strength equation for concrete beams in CSA A23.3-04 and ACI 318-11. Comparing the test results with the estimations based on the proposed equation, CSA A23.3-04 modified equation predicted the shear strength better than ACI 318-11modified equation.

국문 초록 (Abstract)

본 논문에서는 새로운 형상의 GFRP 판으로 전단 보강된 철근콘크리트 보의 전단강도 산정식을 제안하기 위하여 기존의 설계규준에 포함된 전단강도식을 수정하여 적용이 가능한지 연구한다. GFRP 판은 개구부가 있는 plate의 형태로서 콘크리트와의일체화 거동을 위하여 콘크리트에 매립하여 시공한다. 총 6개의 시험체에 대한 전단실험을 수행하고, 전단경간비는 2.4로 설정한다. 실험 변수는 전단보강량 및 전단보강재의 형상으로 선정한다. GFRP 판의 형상에는 기본격자형 및 평행사변형 두 가지가있다. GFRP 판으로 보강된 콘크리트 보의 전단강도식은 CSA A23.3-04 기준식과 ACI 318-11 기준식의 수정식을 통해 제안되었다. 결과적으로 실험에 의한 전단강도와 제안식에 의한 전단강도를 비교한 결과, ACI 318-11 수정식보다 CSA A23.3-04수정식이 전단강도를 더 잘 예측하는 것으로 나타났다.

참고문헌 (Reference)

1 최종훈, "매립형 유공 GFRP 판으로 보강된 RC보의 전단거동에 관한 실험적 연구" 한국콘크리트학회 24 (24): 407-414, 2012

2 Vecchio, F.J., "The Modified Compression- Field Theory for Reinforced Concrete Elements Subjected to Shear" 83 (83): 219-231, 1986

3 Evan, C. B., "Simplified Modified Compression Field Theory for Calculating Shear Strength of Reinforced Concrete Elements" 103 (103): 614-624, 2006

4 Voo, Y. L., "Shear Strength of Steel Fiber-Reinforced Ultrahigh-Performance Concrete Beams without Stirrups" 136 (136): 1393-1400, 2010

5 Collins, M.P., "Rational approach to shear design-the 1984 Canadian code provisions" 83 (83): 925-933, 1984

6 Sergio, F. B., "Increasing Flexural Capacity of Reinforced Concrete Beams Using Carbon Fiber-Reinforced Polymer Composites" 100 (100): 36-46, 2003

7 Benmokrane, B, "Flexural response of concrete beams reinforced with FRP reinforcing bars" 93 (93): 46-55, 1996

8 Michael, S., "Experimental Investigation of Lap Splices in Externally Bonded Carbon Fiber-Reinforced Plastic Plates" 100 (100): 3-10, 2003

9 EI-Sayed, A.K., "Evaluation of shear design equations of concrete beams with FRP reinforcement" 15 (15): 9-20, 2011

10 Bischoff, P.H, "Effective moment of inertia for calculating deflections of concrete members containing steel reinforcement and fiber-reinforced polymer reinforcement" 104 (104): 68-76, 2007

11 Mitchell, D., "Diagonal Compression Field Theory-A Rational Model for Structural Concrete in Pure Torsion" 71 (71): 396-408, 1974

12 Evan, C.B, "Development of the 2004 Canadian Standards Association (CSA) A23.3 shear provisions for reinforced concrete" 33 (33): 521-534, 2004

13 CSA Committee A23.3, "Design of Concrete Structures"

14 ACI Committee 318-11, "Building code Requirements for Structural Concrete"

15 Pallegrino, C., "An experi -mentally based analytical model for the shear capacity of FRP-strengthened reinforced concrete beams" 44 (44): 231-244, 2008