Browse > Article
http://dx.doi.org/10.12989/cac.2015.15.1.021

High-strength concrete deep beams with web openings strengthened by carbon fiber reinforced plastics  

Lu, Wen-Yao (Department of Interior Design, China University of Technology)
Yu, Hsin-Wan (Department of Civil Engineering, China University of Technology)
Chen, Chun-Liang (Department of Interior Design, China University of Technology)
Liu, Shen-Lung (Department of Interior Design, China University of Technology)
Chen, Ting-Chou (Department of Interior Design, China University of Technology)
Publication Information
Computers and Concrete / v.15, no.1, 2015 , pp. 21-35 More about this Journal
Abstract
The objective of this study is to examine the effect of carbon fiber reinforced polymer (CFRP) on the shear strengths of deep beams with web openings. A total of 18 high-strength concrete deep beams with web openings were tested. Twelve were externally wrapped with four layers of CFRP, six of them strengthened in the horizontal direction and the others in the vertical direction. The parameters of the configuration of CFRP, the sizes of the openings and the locations of the openings were covered in this study. The test results indicates the shear strengths of deep beams with openings sized $60{\times}40mm$ were about 16% higher than that with openings sized $68{\times}68mm$. For deep beams with openings sized $60{\times}40mm$, the lower the locations of openings the higher the shear strengths were. The test results also indicate the shear strengths of deep beams with web openings strengthened by CFRP wrapped in the vertical direction can be enhanced by about 10%. However, the shear strengths of deep beams with web openings strengthened by CFRP wrapped in the horizontal direction can only be enhanced by about 6%. The shear strengths of deep beam, with different size and location of web openings and strengthened by different configuration of CFRP can be reasonably predicted by the empirical formulas of Kong and Sharp.
Keywords
deep beams; web openings; shear strengths; carbon fiber reinforced plastics (CFRP);
Citations & Related Records
Times Cited By KSCI : 5  (Citation Analysis)
연도 인용수 순위
1 American Concrete Institute (2011), "Building code requirements for structural concrete (ACI 318-11) and Commentary (ACI 318R-11)", Farmington Hills, Mich.
2 Anil, o., Bulut, N. and Ayhan, M. (2012), "Strain distribution between cfrp strip and concrete at strengthened RC beam against shear", Struct. Eng. Mech., 41(4), 509-525.   DOI
3 Chakrabortty, A. and Khennane, A. (2014), "Failure mechanisms of hybrid FRP-concrete beams with external filament-wound wrapping", Adv. Concr. Constr., 2(1), 57-75.   DOI
4 Elwan, S.K. and Rashed, A.S. (2011), "Experimental behavior of eccentrically load R.C. short columns strengthened using CFRP wrapping", Struct. Eng. Mech., 39(2), 207-221.   DOI
5 Kong, F.K. and Sharp, G.R. (1973), "Shear strength of lightweight reinforced concrete deep beams with web openings", Struct. Eng., 51(8), 267-275.
6 Kong, F.K. and Sharp, G.R. (1977), "Structural idealization for deep beams with web openings", Mag. Concrete Res., 29(99), 81-91.   DOI
7 Li, Y.F., Lin, C.T. and Sung, Y.Y. (2003), "A constitutive model for concrete confined with carbon fiber reinforced plastics", Mech. Mater., 35(3), 603-619.   DOI
8 Lu, W.Y., Yu, H.W., Chen, C.L., Yang, T.H. and Lin, Y.S., (2012) "Reinforced concrete corbels strengthened with carbon fiber reinforced plastics", Comput. Concr., 10(3), 259-276.   DOI
9 Shuraim, A.B. (2011), "Efficacy of CFRP configurations for shear of RC beams: experimental and NLFE", Struct. Eng. Mech., 39(3), 361-382.   DOI
10 Sobuz, H.R., Ahmed, E., Hasan, N.M.S. and Uddin, M.A. (2011), "Use of carbon fiber laminates for strengthening reinforced concrete beams in bending", Int. J. Civil Struct. Eng., 2(1), 67-84.
11 Yang, K.Y., Chung, H.S and Ashour, A.F. (2007), "Influence of inclined web reinforcement on reinforced concrete deep beams with openings", ACI Struct. J., 104(5), 580-589.
12 Yang, K.Y. and Ashour, A.F. (2008), "Effectiveness of web reinforcement around openings in continuous concrete deep beams", ACI Struct. J., 105(4), 414-424.