Behaviour of U and L shaped end anchored steel plate strengthened reinforced concrete beams

Jumaat, M.Z. and Alam, M.A. (2008) Behaviour of U and L shaped end anchored steel plate strengthened reinforced concrete beams. European Journal of Scientific Research, 22 (2). pp. 184-196. ISSN 1450216X

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Abstract

Flexural strengthening of reinforced concrete (r.c.) beam is now becoming more and more important in the field of structural maintenance and retrofitting. Plate bonding methods using steel plates are very widely used in this field. However, premature debonding at plate ends i.e. end peelings have been a major concern in using these methods. Researchers in general concluded that shear and normal stress concentrations at the plate cut-off point are the main reasons causing end peeling. For minimizing these stresses to prevent end peeling, end anchoring using U and L shape metal plates is proposed in this paper. This paper presents the results of experimental studies carried out to investigate the effect of U and L shaped end anchors on steel plate strengthened reinforced concrete beams. A total of four beam were cast. One beam was left un-strengthened as the control; the remainder three beams were strengthened with steel plates. From the strengthened beams, one was simply strengthened without end anchors and two were end anchored using U and L shaped anchor plates respectively. The results indicate that, all strengthened beams exhibited higher failure and cracking loads with less strain, deflection and crack width and better crack patterns than the control beam. It is also indicate that the strengthened beams with end anchors recorded the highest failure loads and their modes of failure were seen to be more ductile compared to the un-anchored strengthened beam. Results also shows that premature end peeling was completely prevented by U and L shaped anchor plates. In comparison, the L shaped end-anchor gave better performance compared to the U shape end anchor.

Item Type: Article
Additional Information: Cited By (since 1996): 5 Export Date: 6 January 2013 Source: Scopus Language of Original Document: English Correspondence Address: Jumaat, M.Z.; Department of Civil Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia; email: zamin@um.edu.my References: Adhikary, B.B., Mutsuyoshi, H., Numerical simulation of steel-plate strengthened concrete beam by a non-linear finite element method model (2002) Construction and Building Materials, 16, pp. 291-301; El-Mihilmy, M.T., Tedesco, J.W., Prediction of anchorage failure for reinforced concrete beams strengthened with fiber-reinforced polymer plates (2001) ACI Structural Journal, 98 (3), pp. 301-314; Garden, H.N., Hollaway, L.C., An experimental study of the influence of plate end anchorage of carbon fibre composite plates used to strengthen reinforced concrete beams (1998) Composite Structures, 42, pp. 175-188; Hussain, M., Sharif, A., Basunbul, A., Baluch, M.H., Al-Aulaimani, G.J., Flexural behaviour of precracked reinforced concrete beams strengthened externally by steel plates (1995) ACI Structural Journal, 92 (1), pp. 14-22; Jones, R., Swamy, R.N., Charif, A., Plate separation and anchorage of reinforced concrete beams strengthened by epoxy-bonded steel plates (1988) The Structural Engineering, 66 (5), pp. 85-94; Oehlers, D.J., Mohamed Ali, M.S., Debonding of steel plates glued to reinforced concrete flexural members (1997) Due to published in the Progress in Structural Engineering and Materials; Oh, B.H., Cho, J.Y., Park, D.G., Failure behaviour and separation criterion for strengthened concrete members with steel plates (2003) Journal of Structural Engineering ASCE, 129 (9), pp. 1191-1198; Saadatmanesh, H., Malek, A.M., Design guidelines for flexural strengthening of RC beams with FRP plates (1998) Journal of Composites for Construction ASCE, 2 (4), pp. 158-164; Swamy, R.N., Jones, R., Bloxham, J.W., Structural behaviour of reinforced concrete beams strengthened by epoxy-bonded steel plates (1987) The Structural Engineer, 65 A (2), pp. 59-68
Uncontrolled Keywords: Debonding, End anchors, Reinforced concrete beam, Steel plate.
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Divisions: Faculty of Engineering
Depositing User: Mr Jenal S
Date Deposited: 21 May 2013 01:56
Last Modified: 04 Oct 2017 07:32
URI: http://eprints.um.edu.my/id/eprint/6091

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