STRENGTHENING OF CRACKED REINFORCED CONCRETE T-BEAM BY JACKETING
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Abstract
This investigation presents an extensive experimental study on the behaviour and strength of reinforced concrete T-beams before and after strengthening by using reinforced concrete jacket. Four full scale beams were first loaded to certain levels of ultimate capacity (0, 60%, 77%, 100% of failure load). Then, after formation of cracks or failure, they were repaired by reinforced concrete jacketing method and tested again up to failure. The main objective of this study is to restore the full ultimate capacity beams failed by flexure and to strengthen the cracked beam. Also, it is aimed to investigate the effect of loading condition on beam before repair on the ultimate capacity after repair. Extensive measurements of deformations, cracking and strength were made before and after repair throughout all stages of loading.Test results showed that the repairing by reinforced jacketing can effectively restore more than 150% of the full flexural capacity of the original beam. Also reinforced jacket can effectively increase the ultimate capacity of cracked T-beam after repair up to 250%. Furthermore, the use of reinforced jacket for the cracked or failed beams is greatly improved serviceability, deformation behaviour, cracking behaviour as well as ductility of T- beams compared to those of the original beams. The ultimate flexural strength of T-beams failed by flexure and repaired by reinforced concrete jacket can accurately be predicted using conventional ultimate strength method of reinforced concrete.
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References
ACI-318M-2005 "Building Code Requirement Concrete: American Concrete Institute, 2005.
British Standard Specifications, Table 32, BS5950part1:1990.
British Standard Specifications for steel tension (BS4449:19888).
Department of th army U.S.Army Corps of Engineers "Evaluation and Repair of Concrete Structures"Manual No. 1110-2-2002.
Emmons.P. H., Vaysburd, Alexander M, and McDonald, James E."Arational Approach to Durable Concrete Repairs, "Concrete International, Vol. 15, No.9, pp40-45.
Ersoy, U, Tankut, T and Suleiman, R. "Behavior of Jacketed columns" ACI Jr. May-June 1993 pp. 288-293.
H.K. Cheong W. MacAlevey, "Experimental behavior of jackted reinforced concrete beams" (2000).
Johnson,S. M. "Detterioration Maintenance, and Repair of Structures"McGraw-Hill, New York.
th International Conference on inspection Appraisal repair and maintenance of buildings and Structures 11-13 September 2001, Nottingham Trent University compus. Nottingham, UK.