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Pre-Cracked Concrete Shear Strengthened with External CFRP Strips | ||
| Journal of Rehabilitation in Civil Engineering | ||
| مقاله 3، دوره 1، شماره 1، اردیبهشت 2013، صفحه 29-38 اصل مقاله (589.08 K) | ||
| نوع مقاله: Regular Paper | ||
| شناسه دیجیتال (DOI): 10.22075/jrce.2013.3 | ||
| نویسندگان | ||
| H. Shariatmadar* 1؛ M. Khatamirad2؛ E. Zamani2 | ||
| 1Associate Professor, Ferdowsi University of Mashhad, Mashhad, Iran | ||
| 2Ph.D., Student, Ferdowsi University of Mashhad, Mashhad, Iran | ||
| تاریخ دریافت: 01 شهریور 1391، تاریخ بازنگری: 27 آذر 1392، تاریخ پذیرش: 21 دی 1391 | ||
| چکیده | ||
| In reinforced concrete design, there are situations where transfer of shear across a specific plane needs to be considered. Examples of such situation include corbels, bearing shoes, ledger beam bearing, and a host of connection between precast concrete elements. In this study, the shear transfer behavior of reinforced concrete is investigated experimentally by conducting test on 6 precracked push-off specimens. The major parameters considered are the amount of reinforcement and externally bonded fiber reinforced polymer fabrics through the shear plane. External strengthening with Fiber Reinforced Polymer (FRP) fabrics is an effective technique for improving the structural performance and life span of the existing reinforced concrete structures. This paper illustrates the result of shear transfer capacity and modes of failure of the precracked reinforced concrete push-off specimens bonded externally with FRP. An experimental investigation was conducted to study the effectiveness of FRP as an external reinforcement. Based on experimental results, the external FRP reinforcement controls the shear slip along the shear plane and crack width. In the unstrengthened push-off specimens, the pre-existing crack along the shear plane will reduce the ultimate shear transfer capacity and increase of shear slip at all load levels. However in strengthened specimens, the external FRP reinforcement will control the increase of slip and increase the ultimate shear stress transfer capacity along the shear plane. | ||
| کلیدواژه‌ها | ||
| Shear friction؛ Push off؛ FRP؛ Pre-cracked | ||
| مراجع | ||
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[1] Allos, A.E. (1989). “Shear transfer in fibre reinforced concrete”. Proceedings of International Conference on Recent Development in Fibre Reinforced Cements and Concrete. R.N. Swamy and B. Barr, eds., Elsevier Applied Science, New York, pp. 146–156. [2] ACI 440, (2002). “Guide for the design and construction of externally bonded FRP systems for strengthening concrete structures”. American Concrete Institute Committee 440, ACI 440.2R, Detroit. [3] Birkeland, P.W., Birkeland, H.W. (1966). “Connections in precast concrete construction”. ACI Journal Proceedings, Vol. 63, No. 3, pp. 345–368. [4] Hofbeck, J.A., Ibrahim, I.O., Mattock, A.H. (1969). “Shear transfer in reinforced concrete”. ACI Journal Proceedings, Vol. 66, No. 2, pp. 119–128. [5] Hsu, T.T., Mau, S.T., Chen, B. (1987). “Theory of shear transfer strength of reinforced concrete”. ACI Structural Journal, Vol. 84, No. 2, 149–160. [6] Hwang, S.J., Yu, H.W., Lee, H.J. (2000). “Theory of interface shear capacity of reinforced concrete”. Journal of Structural Engineering, Vol. 126, No. 6, pp. 700–707. [7] Kahn, F.L., Mitchell, A.D. (2002). “Shear friction tests with high strength concrete”. ACI Structural Journal, Vol. 99, No. 1, pp. 98–103. [8] Khalifa, A., Nanni, A. (2000). “Improving shear capacity of existing RC T-section beams using CFRP composites”. Cement and Concrete Composites, Vol. 22, No. 2, pp. 165-174. [9] Khalifa, A., Gold, W.J., Nanni, A., Abdel Aziz, M.I. (1998). “Contribution of externally bonded FRP to shear capacity of RC flexural members”. Journal of Composites for Construction, Vol. 2, No. 4, pp. 195-202. [10] Mattock, A.H. (2001). “Shear friction and high-strength concrete”. ACI Structural Journal, Vol. 98, No. 1, pp. 50–59. [11] Mattock, A.H., Hawkins, N.M. (1972). “Shear transfer in reinforced concrete-recent research”. PCI Journal, Vol. 17, No. 2, pp. 55–75. [12] Mattock, A.H., Li, W.K., Wang, T.C. (1976). “Shear transfer in lightweight reinforced concrete”. PCI Journal, Vol. 21, No. 1, pp. 20–39. [13] Pantelides, C.P., Volnyy, V.A., Gergely, J., Reaveley, L.D. (2003). “Seismic retrofit of precast concrete panel connections with carbon fibre reinforced polymer composites”. PCI Journal, Vol. 48, No. 1, pp. 92–104. [14] Reinhardt. H.W., Walraven. J.C. (1982). “Cracks in concrete subject to shear”. Journal of Structural Division, ASCE, Vol. 106, ST1, pp. 207-224. [15] Saenz, N. (2003). “Contribution of fibre reinforced polymer composite to concrete shear transfer”. M.Sci. thesis, University of Utah, Salt Lake City. [16] Saenz, N., Pantelides, C.P. (2005). “Shear friction capacity of concrete with external carbon FRP strips”. Journal of Structural Engineering, Vol. 131, No. 12, pp. 1911-1919. [17] Valle, M., Büyüköztürk, O. (1993). “Behavior of fibre reinforced high-strength concrete under direct shear”. ACI Material Journal, Vol. 90, No. 2, pp. 122–133. [18] Walraven, J.C., Reinhardt, H.W. (1981). “Theory and Experiments on mechanical behavior of cracks in plain and reinforced concrete subjected to shear loading”. Heron Vol. 26, No. 1. | ||
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