Jumaat, Mohd Zamin and Alam, M.A. (2011) Optimization of intermediate anchors to eliminate premature shear failure of CFRP laminate flexurally strengthened R.C beams. International Journal of Physical Sciences, 6 (2). pp. 182-192. ISSN 19921950, DOI https://doi.org/10.5897/IJPS10.158.
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Abstract
Flexurally strengthened RC beams usually fail by means of premature shear due to low shear as compared to flexure. Intermediate anchors in the length of shear span of those beams would successfully eliminate this problem. This paper presents the experimental studies on the effects of intermediate anchors in preventing premature shear failure of CFRP laminate flexurally strengthened RC beams. Design guidelines to optimize the intermediate anchors for eliminating premature shear failure are proposed. In the experimental programme, four RC beams were cast. One beam was tested in the un-strengthened condition to act as the control beam. The remaining beams were strengthened with CFRP laminates. Among the strengthened beams, one beam was prepared without intermediate anchors, one was intermediate anchored based on the proposed design method, and the last one was intermediate anchored using arbitrary anchor plates. Results showed that strengthened beam with having optimal intermediate anchors had higher ultimate strength as compared to that of the control beam. The optimal anchors significantly increased both the ultimate load as well as ductility of the said beams as compared to the beam without intermediate anchors. Moreover, the optimal intermediate anchors also reduced the number of cracks and crack widths in the shear span region. In conclusion, the beam with optimal intermediate anchors had identical failure load, crack widths, deflections and strain characteristics as that of arbitrarily anchored strengthened beam.
| Item Type: | Article |
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| Funders: | UNSPECIFIED |
| Additional Information: | Cited By (since 1996): 4 Export Date: 6 January 2013 Source: Scopus Language of Original Document: English Correspondence Address: Alam, M. A.; Department of Civil Engineering, University of Malaya, 50603, Kuala Lumpur, Malaysia; email: ashrafarif2003@yahoo.com References: Adhikary, B.B., Mutsuyoshi, H., Ashraf, M., Shear Strengthening of Reinforced Concrete Beams Using Fiber-Reinforced Polymer Sheets with Bonded Anchorage (2004) ACI Struct. J., 101 (5), pp. 660-668; Aram, M.R., Czaderski, C., Motavalli, M., Debonding failure modes of flexural FRP-strengthened RC beams (2008) Composites: Part B., 39, pp. 826-841; Bahn, B.Y., Harichandran, R.S., Flexural behaviour of reinforced concrete beams strengthened with CFRP sheets and epoxy mortar (2008) J. Comp. Construc., 12 (4), pp. 387-395; Bencardino, F., Spadea, G., Swamy, R.N., The problem of shear in RC beams strengthened with CFRP laminates (2007) Construc. Build. Mater., 21, pp. 1997-2006; El-Mihilmy, M.T., Tedesco, J.W., Prediction of anchorage failure for reinforced concrete beams strengthened with fiber-reinforced polymer plates (2001) ACI Struct. J., 98 (3), pp. 301-314; Jumaat, M.Z., Alam, M.A., Behaviour of U and L shaped end anchored steel plate strengthened reinforced concrete beams (2008) Eur. J. Sci. Res., 22 (2), pp. 184-196; Jumaat, M.Z., Alam, M.A., Effects of intermediate anchors on end anchored carbon fibre reinforced polymer laminate flexurally strengthened reinforced concrete beams (2009) J. Appl. Sci., 9 (1), pp. 142-148; Jumaat, M.Z., Alam, M.A., Experimental and numerical analysis of end anchored steel plate and CFRP laminate flexurally strengthened R. C. beams (2010) Int. J. Phys. Sci., 5 (2), pp. 132-144; Kim, Y.J., Wight, R.G., Green, M.F., Flexural strengthening of RC beams with prestressed CFRP sheets: Using non-metallic anchor systems (2008) J. Comp. Construc., 12 (1), pp. 44-52; Malek, A.M., Saadatmanesh, H., Ultimate Shear Capacity of Reinforced Concrete Beams Strengthened with Web-Bonded Fiber Reinforced Plastic Plates (1998) ACI Struct. J., 95 (4), pp. 391-399; Grace, N.F., Strengthening of Negative Moment Region of Reinforced Concrete Beams Using Carbon Fiber-Reinforced Polymer Strips (2001) ACI Struct. J., 98 (3), pp. 347-358; Smith, S.T., Teng, J.G., Interfacial stresses in plated beams (2001) Eng. Struct., 23, pp. 857-871; Swamy, R.N., Mukhopadhaya, P., Debonding of carbon-fibrereinforced polymer plate from concrete beams (1999) Proc. Instn Civ. Engrs. Structs. Bldgs, 134, pp. 301-317; Teng, J., Cheng, J., Smith, S., Lam, L., (2002) FRP-Strengthened RC Structures, , John Wiley and sons, UK, First Edition; Tounsi, A., Daouadji, T.H., Benyoucef, S., Bedia, E.A.A., Interfacial stresses in FRP-plated RC beams: Effect of adherent shear deformation (2009) Int. J. Adhesion Adhes., 29 (4), pp. 343-351 |
| Uncontrolled Keywords: | CFRP laminate, Intermediate anchors, Premature shear, RC beam. |
| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) |
| Divisions: | Faculty of Engineering |
| Depositing User: | Mr Jenal S |
| Date Deposited: | 29 Apr 2013 02:24 |
| Last Modified: | 05 Feb 2020 04:33 |
| URI: | http://eprints.um.edu.my/id/eprint/5976 |
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