Gopal Charan Behera, Manoranjan Dhal

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Wrapping technology is one of the effective ways of strengthening concrete elements. Several researchers reported the effectiveness of Glass fiber reinforced polymers and carbon fiber reinforced polymers for improving the strength of the concrete elements. Wrapping on three sides is one of the effective methods for strengthening the beams supporting slabs. Scant literature is available on the strength enhancement of “U” wrapped concrete elements subjected to torsional loads. In this investigation an attempt is made to quantify the improvement in the behaviour of “U” wrapped rectangular concrete members subjected to torsional loads “U” wraps. Ferrocement is taken here as wrapping material. Beams were cast with different number of mesh layers with different torsional reinforcement. The beams were analyzed with MARS. The predictions are in good agreement with experimental test results.


ferrocement, U wrap, Ultimate Torque, MARS, ferrocement

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ACI committee 318, (2002). Building code requirements for structural concrete and commentary, ACI 318R-02: Farmington Hills, Michigan.

ACI Committee 549. (1979). Ferrocement-Materials and Applications. ACI Symposium Proceedings SP-61: American Concrete Institute 549, Farmington Hills, Michigan.

Ameli, M., and Ronagh,H.( July-Aug 2007). “Analytical model for evaluating torque of FRP strengthened reinforced concrete beams.” Journal of Composites for construction ,pp. 384-390.

Bansal,P.P., Kumar, M. and Kaushik,S. K.(2007). “ Effect of mesh orientation on strength of beams retrofitted using ferrocement jacket.” International Journal of Engineering, Vol- 20 Issue-(1),pp.8-19.

Behera, G. C. Rao , T. D. G. & Rao, C. B. K .(August-2008). “ Torsional Capacity of High Strength Concrete Beams jacketed with ferrocement U wraps.” Asian Journal of Civil Engineering, Volume -9 Number 4 ,pp. 411-422.

Behera, G. C. Rao, T. D. G. & Rao, C. B. K“A study on post cracking torsional behaviour of high strength reinforced concrete beams with ferrocement “u” wraps” Vol. 22, 2014, No. 3, DOI: 10.2478/sjce-2014-0012, Slovak Journal of Civil Engineering,pp.1 – 12.

Behera, G. C. Rao, T. D. G. & Rao, C. B. K “Analytical model for torsional response of RC beams strengthened with ferrocement U-Wraps” DOI: 10.2749/101686614X13854694314847, SEI Vol.24, No.4, Nov-2014, IABSE Structural Engineering International, pp.509-520.

Chalioris, C.E.(2006). “Experimental Study of the Torsion of Reinforced Concrete Members.” Structural Engineering and Mechanics, Vol. 23, No. 6, pp. 713-737.

Chalioris, C.E.(2007). “Analytical Model for the Torsional Behaviour of Reinforced Concrete Beams Retrofitted with FRP Materials.” Engineering Structures, Vol. 29, No. 12, pp. 3263-3276.

Chalioris, C.E.(2008). “Torsional Strengthening of Rectangular and Flanged Beams using Carbon Fibre-Reinforced-Polymers - Experimental Study.” Construction and Building Materials, Vol. 22, No. 1, pp. 21-29, 2008.

Chalioris C.E., Thermou, G.E. and Pantazopoulou, S.J. (2014). “Behaviour of Rehabilitated RC Beams with Self-Compacting Concrete Jacketing - Analytical Model and Test Results." Construction and Building Materials, Vol. 55, pp. 257-273.

Deifalla ,A., Awad, A. and Elgarhy, M. (2013). “ Effectiveness of externally bonded CFRP strips for strengthening flanged beams under torsion; An experimental study.”Engineering structure (56),pp.2065-2075.

Deifalla, A. and Ghobarah, A.(2010 a). “Full Torsional Behavior of RC Beams Wrapped with FRP: Analytical Model.” Journal of Composites for Construction, Vol.14,No.3,pp.289-300.

Deifalla, A. and Ghobarah, A.(2010 b). “ Strengthening RC T-beams Subjected to Combined Torsion and Shear using FRP Fabrics: Experimental study.”, Journal of Composites for Construction, Vol. 14, No. 3, pp. 301-311.

Ghobarah, A. Ghorbel, M. N. and Chidiac, S. E.( November-2002). “ Upgrading Torsional Resistance of Reinforced Concrete Beams Using Fiber-Reinforced Polymer.” ASCE Journal of composites for Construction, Vol- 6 No.4, pp. 257-263.

Hii A, K. Y. and Riyad, A.M.(2006).“An experimental and numerical investigation on torsional strengthening of solid and box- section RC beams using CFRP laminates.” Composite structures,vol.75, pp. 213-221.

Hii, A.K.Y. and Riyad, A. M. (Jan-Feb 2007). “Torsional capacity of CFRP Strengthened reinforced concrete beams.” Journal of Composites for construction ASCE, pp. 71-80.

Karayannis, C.G., Chalioris, C.E.and Sirkelis, G.M.(2008). “ Local Retrofit of Exterior RC Beam-Column Joints using Thin RC Jackets - An Experimental Study.” Earthquake Engineering and Structural Dynamics, Vol. 37, No. 5, pp. 727-746.

Kumar, P.R., Oshima, T, M. and Yamazaki, T.(2007). “ Studies on RC and ferrocement jacketed columns subjected to simulated seismic loading” Asian Journal of Civil Eng (Build Housing), Vol.8(2), pp.215–225.

Li, B.,Lam, E.S.S., Wu, B. and Wang, Y.-Y.(2013). “ Experimental Investigation on Reinforced Concrete Interior Beam-Column Joints Rehabilitated by Ferrocement Jackets,” Engineering Structures, Vol. 56, pp. 897-909.

Liang-Jenq, Leu. and Yu-Shu, Lee.( February 2000). “ Torsion design charts for reinforced concrete rectangular members.” journal of structural engineering ASCE,pp.210-218.

Ming, J. and Grunberg, J.(2006). “Mechanical analysis of reinforced concrete box beam Strengthened with carbon fiber sheets under combined actions.” Composite Structures, vol.73,pp. 488-494.

Ming, J., Werasak, R. and Zhongxian, Li.(2007). “Torsional strengthening of reinforced concrete box beams using carbon fiber reinforced polymer.” Science Direct ,Composite structures ,Vol.78, pp.264-270.

Nie, J., Liang, T. and Cai,S. C.(2009). “ Performance of steel- concrete composite beams under combined bending and torsion”. journal of structural Engineering,ASCE,pp.1049-1057.

Panchacharam,S. and Belarbi,A.(13-19 October 2002).“Torsional Behavior of Reinforced Concrete Beams Strengthened with FRP Composites.” In Proceedings of First FIB Congress, Osaka, Japan, pp. 1-11.

Rao, T. D. G. and Seshu, D.R. (2005). “ Analytical model for torsional response of steel fiber reinforced concrete members under pure torsion.” Concrete and Cement Composites, Vol. 27,pp.493-501.

Rao, T. D. G. and Seshu, D.R.(2006). “ Torsional Response of fibrous reinforced concrete beams; Effect of single type reinforcement.” Construction and Building materials , Vol.20,pp.187-192.

Rao,T. D. G. and Seshu, D.R. (2003). “Torsion of steel fiber reinforced concrete members.” Cement and Concrete Research, pp. 1783-1788.

Rita, S. Y., Wong, F. and Vecchio, J. (January-Feb-2003). “Towards Modeling of Reinforced Concrete Members with Externally Bonded Fiber-Reinforced Polymer Composites.” ACI Structural Journal, pp.47-55.

Salom, P.R., Gergely, J., and Young, D .T.(January 2003). “Torsional retrofit of Spandrel Beams with composite Laminates.” In: Proceedings of Institution of Civil Engineers, Structures and Buildings, 157 Issues SBI,pp. 69-76.

Salom,P.R., Greeley, J.R. and David,Y.T.(March-April 2004).“Torsional Strengthening of Spandrel Beams with Fiber-Reinforced Polymer Laminates.”Journal of composites for construction, ASCE, pp.157-162.

Santhakumar, D. R. and Chandrasekharan, E.(2007). “Behaviour of reinforced concrete beams under combined bending and torsion: A numerical study.” Electronic Journal of structural Journal, pp. 1-7.

Shannag, M.J. and Mourad, S.M.(2012). “Flowable high strength cementitious matrices for ferrocement applications.” Construction and Building Materials, Vol. 36, pp. 933-939.


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