Experimental Study on Reinforced Concrete Box Beam Strengthened by CFRP under Combined Action

Abstract:

An experimental investigation was presented in this paper on reinforced concrete box beams subjected to shear, torsion, and bending moment strengthened by carbon fiber reinforced polymer (CFRP). Eight box beams were cast and separated into two groups according to two different torque-to-shear and torque-to-bending moment ratios. Three box beams from each group strengthened by CFRP in different configurations and one control box beam were tested. The main parameters of this experiment were the different ratios and configurations, including U-jacket layers and U-jacket strips with or without longitudinal strips. The cracking and failure mode, effect of wrapping configuration, torsional capacity, and behavior of the different torque-to-shear and torque-to-bending moment ratios were studied in the paper.

• Periodical: Applied Mechanics and Materials (Volume 802)
• Pages: 184-189
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.802.184
• Online since: October 2015
• Authors: Sheng Qiang Ma, Norazura Muhamad Bunnori*, Kok Keong Choong
• Keywords: Box Beam, Carbon Fiber Reinforced Polymer (CFRP), Combined Actions, Reinforced Concrete, Strengthened

References

[1] A. Khalifa, W.J. Gold, A. Nanni, and A.A. MI, Contribution of externally bonded FRP to shear capacity of RC flexural members, Journal of Composites for Construction. 2 (1998) 195-202.

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

[2] T.C. Triantafillou, C.P. Antonopoulos, Design of concrete flexural members strengthened in shear with FRP, Journal of Composites for Construction. 4 (2000) 198-205.

DOI: 10.1061/(asce)1090-0268(2000)4:4(198)

[3] A. Khalifa, A. Nanni, Improving shear capacity of existing RC T-section beams using CFRP composites, Cement and Concrete Composites. 22 (2000) 165-174.

DOI: 10.1016/s0958-9465(99)00051-7

[4] A. Carolin, B. Täljsten, Experimental study of strengthening for increased shear bearing capacity, Journal of Composites for Construction. 9 (2005) 488-496.

DOI: 10.1061/(asce)1090-0268(2005)9:6(488)

[5] A. Ghobarah, M. Ghorbel and S. Chidiac, Upgrading torsional resistance of reinforced concrete beams using fiber-reinforced polymer, Journal of composites for construction. 6 (2002) 257-263.

DOI: 10.1061/(asce)1090-0268(2002)6:4(257)

[6] C. Chalioris, Behavioural model of FRP strengthened reinforced concrete beams under torsion. in Asia-Pacific Conference on FRP in Structures , Hongkong, China, (2007).

[7] R. Al-Mahaidi, A.K.Y. Hii, Bond behaviour of CFRP reinforcement for torsional strengthening of solid and box-section RC beams, Composites Part B: Engineering. 38 (2007) 720-731.

DOI: 10.1016/j.compositesb.2006.06.018

[8] C.E. Chalioris, Torsional strengthening of rectangular and flanged beams using carbon fibre-reinforced-polymers – Experimental study, Construction and Building Materials. 22 (2008) 21-29.

DOI: 10.1016/j.conbuildmat.2006.09.003

[9] A.K.Y. Hii, R. Al-Mahaidi, An experimental and numerical investigation on torsional strengthening of solid and box-section RC beams using CFRP laminates, Composite Structures. 75 (2006) 213-221.

DOI: 10.1016/j.compstruct.2006.04.050

[10] M. Jing, J. Grünberg, Mechanical analysis of reinforced concrete box beam strengthened with carbon fiber sheets under combined actions, Composite Structures. 73 (2006) 488-494.

DOI: 10.1016/j.compstruct.2005.02.020

[11] M. Jing, W. Raongjant and Z. Li, Torsional strengthening of reinforced concrete box beams using carbon fiber reinforced polymer, Composite Structures. 78 (2007) 264-270.

DOI: 10.1016/j.compstruct.2005.10.017