Prediction the Shear Strength for FRP Shear Strengthened RC Beams Based on Optimised Truss Models

Abstract:

This paper presents the analytical optimised truss model based on the principle of the minimum total strain energy theorem. The model was validated against 90 experimental data collected from the literature. The predicted shear strength in the analysis showed a very satisfactory correlation with the test results, with the average experimental/analytical failure load ratio of 1.09 and the coefficient of variation (C.O.V) of 14.1%. Furthermore, a comparison between the accuracy of the proposed model and the current design guidelines was also demonstrated in this study. It was observed that the optimised truss model led to be more viable than the standard 45-deg truss model in the design guidelines. A large dispersion of the results was found in ACI 440 with the C.O.V as far as 31.4%; whilst the TR 55 and fib 14 showed no significant difference with the C.O.V of 29.3% and 21.5%, respectively.

• Periodical: Applied Mechanics and Materials (Volume 567)
• Pages: 469-475
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.567.469
• Online since: June 2014
• Authors: Hor Yin*, Teo Wee
• Keywords: FRP Strengthening, Optimised Truss Model, RC Beam, Shear Analysis, Shear Strength

References

[1] CNR-DT200/2004, Guide for the Design and Construction of Externally Bonded FRP Systems for Strengthening Existing Structures, Rome, (2004).

[2] ACI Committee 440 (ACI 440. 2R-08), Guide for the Design and Construction of Externally Bonded FRP Systems for Strengthening Concrete Structures, Farmington Hills, (2008).

DOI: 10.14359/51700867

[3] fib Bulletin No. 14, Design and use of externally bonded fibre reinforced polymer reinforcement (FRP EBR) for reinforced concrete structures, Task Group 9. 3, Switzerland, (2001).

[4] J. Schlaich, K. Schäfer, and M. Jennewein, Toward a consistent design of structural concrete, PCI J., 32 (1987) 74-150.

DOI: 10.15554/pcij.05011987.74.150

[5] ACI Committee 318 (ACI 318-08), Building Code Requirements for Structural Concrete and Commentary. Farmington Hills, (2008).

DOI: 10.1061/(asce)1076-0431(1996)2:3(120.3)

[6] W. Teo and Y. Hor, Analytical truss models for prediction the shear strength of FRP strengthened reinforced concrete members, FRPRCS11, UM, Guimarães, (2013).

[7] A. Bousselham and O. Chaallal, Mechanisms of shear resistance of concrete beams strengthened in shear with externally bonded FRP, J. Compos. Constr., 12 (2008) 499-512.

DOI: 10.1061/(asce)1090-0268(2008)12:5(499)

[8] T. C. Triantafillou, Shear strengthening of reinforced concrete beams using epoxy-bonded FRP composites, ACI Struct. J., 95, (1998).

DOI: 10.14359/531

[9] A. Khalifa, W. Gold, A. Nanni, and A. M.I., Contribution of Externally Bonded FRP to Shear Capacity of RC Flexural Members, J. Compos. Constr., 2 (1998) 195-202.

DOI: 10.1061/(asce)1090-0268(1998)2:4(195)

[10] Z. Zhang and C. -T. T. Hsu, Shear strengthening of reinforced concrete beams using carbon-fiber-reinforced polymer laminates, J. Compos. Constr., 9 (2005) 158-169.

DOI: 10.1061/(asce)1090-0268(2005)9:2(158)

[11] I. Bukhari, R. Vollum, S. Ahmad, and J. Sagaseta, Shear strengthening of reinforced concrete beams with CFRP, Magaz. Concr. Res., 62 (2010) 65-77.

DOI: 10.1680/macr.2008.62.1.65