The effectiveness of FRP-rehabilitation of deteriorating and under-strength reinforced concrete beams depends not only on the properties of the FRP material, but also on the characteristics of other materials in the system, characteristics of the bond, and the relative nature of properties of materials at the interfaces. Response is also affected by the cracked condition of the beam prior to the external bonding of the FRP. An understanding of the effect of critical material and configuration parameters on strengthening response and failure mode is essential to optimize the technique. Most current models do not present a comprehensive overview of both response, and mechanisms and modes of failure. This paper reports on the development of a finite element analysis approach which not only provides characteristics of response, but also enables identification of damage mechanisms and their progression to failure. The model incorporates a fracture-based approach and includes modules for constitutive response of the concrete, reinforcing steel, FRP composite, and the FRP composite-concrete interface.
Mirmiran, A., Shahawy, M., Nanni, A. and Karbhari, V.M. (2004). Bonded Repair and Retrofit of Concrete Structures Using FRP Composites: Recommended Construction Specifications and Process Control Manual, NCHRP Report 514, TRB, National Academy Press, Washington, D.C.
2.
Kamiharako, A., Shimomura, T., Maruyama, K. and Nishida, H. (1999). Stress Transfer and Peeling-Off Behavior of Continuous Fiber Reinforced Sheet-Concrete System, Proceedings of the Seventh East Asia-Pacific Conference on Structural Engineering & Construction, pp. 1283—1288, Kochi, Japan.
3.
Sato, Y., Asano, Y. and Ueda, T. (2000). Fundamental Study on Bond Mechanism of Carbon Fiber Sheet, Journal of Material, Concrete Structures and Pavements, JSCE, 47(648): 71—87.
4.
Yoshizawa, H. , Wu, Z.S., Yuan , H. and Kanakubo, T. (2000). Study on FRP-Concrete Interface Bond Performance, Journal of Material, Concrete Structures and Pavements , JSCE, 49(662): 105—119.
5.
Nakaba, K., Kanakubo, T., Furuta, T. and Yoshizawa, H. (2001). Bond Behavior Between Fiber-Reinforced Polymer Laminates and Concrete, ACI Structural Journal, 98(3): 359—367.
6.
Lorenzis, L.D. , Miller, B. and Nanni, A. (2001). Bond of FRP Laminates to Concrete, ACI Materials Journal, 98(3): 256—264.
7.
Federation Internationale du Benton (fib). (2001). Externally Bonded FRP Reinforcement for RC Structures, fib Bulletin14.
8.
Teng, J.G., Chen, J.F., Smith, S.T. and Lam, L. (2002). FRP-Strengthened RC Structures, Chichester, UK , John Wiley & Sons, Ltd.
9.
Wu, Z.S. , Yuan, H. and Niu , H.D. (2002). Stress Transfer and Fracture Propagation in Different Kinds of Adhesive Joints , ASCE Journal of Engineering Mechanics, 128(5): 562—573.
10.
Karbhari, V.M. , Niu, H. and Sikorsky, C. (2006). Review and Comparison of Fracture-Mechanics-Based Bond Strength Models for FRP-Strengthened Structures , Journal of Reinforced Plastics and Composites, 25(7): 1757—1794.
11.
Wu, Z.S. and Yin, J. (2003). Fracture Behaviors of FRP-Strengthened Concrete Structures, Engineering Fracture Mechanics, 70: 1339—1355.
12.
Sharif, A., Al-Sulaimani, G.J., Basunbul, I.A., Baluch, M.H. and Ghaleb, B.N. (1994). Strengthening of Initially Loaded Reinforced Concrete Beams Using FRP Plates, ACI Structural Journal, 91(2): 160—168.
13.
Hussain, M. , Sharif, A., Basunbul , I.A., Baluch, M.H. and Al-Sulaimani , G.J. (1995 ). Flexural Behavior of Precracked Concrete Beams Strengthened Externally by Steel Plates, ACI Structural Journal, 92(1): 14—22.
14.
Arduini, M. and Nanni, A. (1997). Behavior of Precracked RC Beams Strengthened with Carbon FRP Sheets, ASCE Journal of Composites for Construction, 1(2): 63—70.
15.
Chan, T.K. and Niall, M.A. (2001). Strengthening of One-Way Slabs Using Carbon Fibre Plates: The Effect of Preload, CSEResearch Bulletin No. 14, Nanyang Technology University, Singapore.
16.
Shahawy, M. , Chaallal, O., Beitelman , T.E. and El-Saad , A. (2001). Flexural Strengthening With Carbon Fiber-Reinforced Polymer Composites of Preloaded Full-Scale Girders, ACI Structural Journal, 98(5): 735—742.
17.
Bizindavyi, L. and Neale, K.W. (1999). Transfer Lengths and Bond Strengths for Composites Bonded to Concrete, ASCE Journal of Composites for Construction, 3(4): 153—160.
18.
Ueda, T., Yamaguchi, R., Shoji, K. and Sato, Y. (2002). Study on Behavior in Tension of Reinforced Concrete Members Strengthened by Carbon Fiber Sheet, ASCE Journal of Composites for Construction, 6(3): 168—174.
19.
Karbhari, V.M. and Niu, H. (2007). FE Investigation of Material and Preload Parameters on FRP Strengthening Performance of RC Beams, Journal of Reinforced Plastics and Composites, (in press).
20.
Eng, C. (2004). The Use of Mechanical Anchorage in FRP Strengthening of Reinforced Concrete Beams, Masters Thesis, University of California San Diego, La Jolla, California, USA.
21.
DIANA-8 User's Manual ( 2002 ). Lakerveld b.v, The Hague.
22.
Feenstra, P.H. (1993). Computational Aspects of Biaxial Stress in Plain and Reinforced Concrete, PhD Thesis, Delft University of Technology, Delft, Netherlands.
23.
Rots, J.G. (1988). Computational Modeling of Concrete Fracture, PhD Thesis, Delft University of Technology, Netherlands.
24.
Comite Euro-International du Beton (1993). CEB-FIP Model Code 1990 (CEB-FIP MC90), Bulletin D'Information No. 215, Lausanne.
25.
Vonk, R.A. (1992). Softening of Concrete Loaded in Compression, PhD Thesis, Eindhoven University of Technology.
26.
Hormann, M., Menrath, H. and Ramm, E. (2002). Numerical Investigation of Fiber Reinforced Polymers Post-Strengthened Concrete Slabs, ASCE Journal of Engineering Mechanics, 128(5): 552—561.
27.
Hognestad, E. (1951). Bulletin 399, University of Illinois Engineering Experiment Station, Urbana, IL, p. 128.
28.
Hollaway, L.C. and Leming, M.B. (1999). Strengthening of Reinforced Concrete Structures Using Externally-Bonded FRP Composites in Structural and Civil Engineering, CRC Press, Woodhead Publishing Ltd., Cambridge.
29.
Tripi, J.M., Bakis, C.E., Boothby, T.E. and Nanni, A. (2002). Deformation in Concrete with External CFRP Sheet Reinforcement, ASCE Journal of Composites for Construction , 4(2): 85—94.
30.
Rots, J.G. (2002). Comparative Study of Crack Models, In: Proceedings of the 3rd DIANA World Conference on Finite Elements in Civil Engineering Applications, Hendriks, M. A. N. and Rots, J. G. (eds), A.A. Balkema Publishers, pp. 17—28. October 9—11, Tokyo, Japan.
31.
ACI 440.2R-02 (2002). Guide to the Design and Construction of Externally Bonded FRP Systems for Strengthening Concrete Structures, American Concrete Institute, Farmington Hills, MI.
