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An Experimental Study on Shear Strengthening of RC Lightweight Deep Beams Using CFRP | ||
| Journal of Rehabilitation in Civil Engineering | ||
| مقاله 2، دوره 2، شماره 2 - شماره پیاپی 4، آبان 2014، صفحه 9-19 اصل مقاله (690.94 K) | ||
| شناسه دیجیتال (DOI): 10.22075/jrce.2014.204 | ||
| نویسندگان | ||
| Azadeh Alsadat Asghari1؛ Zahra Tabrizian* 2؛ Morteza Hossein Ali Beigy3؛ Gholamreza Ghodrati Amiri4؛ Bahram Navayineya3 | ||
| 1PhD Student, College of Civil Engineering, Babol Noshirvani University of Technology, Babol, Iran | ||
| 2PhD candidate, College of Civil Engineering, Babol Noshirvani University of Technology, Babol | ||
| 3Assistant Professor, College of Civil Engineering, Babol Noshirvani University of Technology, Babol, Iran | ||
| 4Professor, Center of Excellence for Fundamental Studies in Structural Engineering, School of Civil Engineering, Iran University of Science & Technology, Tehran, Iran | ||
| تاریخ دریافت: 08 آبان 1391، تاریخ بازنگری: 08 مهر 1393، تاریخ پذیرش: 30 مهر 1393 | ||
| چکیده | ||
| . This paper presents the results of an experimental investigation on shear strength enhancement of reinforced concrete deep beams externally reinforced with fiber reinforced polymer (FRP) composites. A total of six deep beam specimens of two different classes, as-built (unstrengthened) and retrofitted were tested in the experimental evaluation program. Two composite systems namely carbon/epoxy laminates and carbon/epoxy sheets were used for retrofit evaluation. A comparative study of the experimental results with published analytical models, including the ACI 440 model, was also conducted in order to evaluate the different analytical models and identify the influencing factors on the shear behavior of FRP strengthened reinforced concrete deep beams. Experimental results indicated that the composite systems provided substantial increase in ultimate strength of strengthened beams as compared to the as-built beam specimen. The strength gain caused by the CFRP sheets was in the range of 30–58% Analytical Comparison indicated that the shear span-to-depth ratio (a/d) is an important factor that actively controls the shear failure mode of beam and consequently influences on the shear strength enhancement. | ||
| کلیدواژه‌ها | ||
| Lightweight concrete؛ deep beams؛ Shear enhancement؛ Analytical modeling؛ CFRP composite | ||
| مراجع | ||
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[1] Mosallam A. (2002), “Composites in construction” In: Kutz M, editor. Handbook of materials selection. New York: John Wiley & Sons, [chapter 45]. [2] Triantafillou, T.C. (1998), “Shear strengthening of reinforced concrete beams using epoxy-bonded FRP composites”, ACI Structural Journal, Vol. 95 (20), pp. 107-115. [3] Deniaud, C. and Cheng, JJR. (2004), “Simplified shear design method for concrete beams strengthened with FRP”, ASCE Journal of Composites for Construction, Vol. 8(5), pp. 425-433. [4] Monti, G. and Liotta, MA. (2007), “Tests and design equation for FRP-strengthening in shear”, Construction and Building Materials Journal, Vol. 21(4), pp.799-809. [5] Zhang, Z. Hsu, C. and Moren, J. (2004), “Shear strengthening of reinforced concrete deep beams using carbon fiber reinforced polymer laminates”, ASCE Journal of Composites for Construction, Vol. 8 (5), pp.403-414. [6] Islam, M., Mansur, M. and Maalej, M. (2005), “Shear strengthening of RC deep beams using externally bonded FRP systems”, Cement & Concrete Composites, Vol. 27 (3), pp. 413-420. [7] Matthys, S. and Triantafillou, T.C. (2001), “Shear and torsion strengthening with externally bonded FRP reinforcement”, In: Reality A, Cosenza E,Manfredi G, Nanni N, editors. Proceedings of the international workshop on composite in construction, Capri, Italy, July 20-21, pp.203-210. [8] Triantafillou, T.C. and Antonopoulos, C.P. (2000), “Design of concrete flexural members strengthened in shear with FRP”, ASCE Journal of Composites for Construction, Vol. 4(4), pp. 198-205. [9] Maaddawy, T.EI and Sherif, S. (2009), “FRP composites for shear strengthening of reinforced concrete deep beams with opening”, Composite Structures, Vol.89, pp. 60-69. [10] Colotti, V. Spadea, G. and Swamy, R.N. (2004), “Analytical model to evaluate failure behavior of plated reinforced concrete beams strengthened for shear”, ACI Structural Journal, Vol.101(6), pp.755-764. [11] ACI Committee 440, (2003), “Guide for the design and construction of externally bonded FRP systems for strengthening concrete structures (ACI 440.2R-02)”, American Concrete Institute, Farmington Hills, Michigan, USA, 45p. [12] ACI Committee 318-02, (1999), “Building code requirements for Structural concrete (ACI 318-02)”, American Concrete Institute, Detroit, 111 pp. | ||
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