Commenced in January 2007
Frequency: Monthly
Edition: International
Paper Count: 32727
Shear Behaviour of RC Deep Beams with Openings Strengthened with Carbon Fiber Reinforced Polymer

Authors: Mannal Tariq


Construction industry is making progress at a high pace. The trend of the world is getting more biased towards the high rise buildings. Deep beams are one of the most common elements in modern construction having small span to depth ratio. Deep beams are mostly used as transfer girders. This experimental study consists of 16 reinforced concrete (RC) deep beams. These beams were divided into two groups; A and B. Groups A and B consist of eight beams each, having 381 mm (15 in) and 457 mm (18 in) depth respectively. Each group was further subdivided into four sub groups each consisting of two identical beams. Each subgroup was comprised of solid/control beam (without opening), opening above neutral axis (NA), at NA and below NA. Except for control beams, all beams with openings were strengthened with carbon fibre reinforced polymer (CFRP) vertical strips. These eight groups differ from each other based on depth and location of openings. For testing sake, all beams have been loaded with two symmetrical point loads. All beams have been designed based on strut and tie model concept. The outcome of experimental investigation elaborates the difference in the shear behaviour of deep beams based on depth and location of circular openings variation. 457 mm (18 in) deep beam with openings above NA show the highest strength and 381 mm (15 in) deep beam with openings below NA show the least strength. CFRP sheets played a vital role in increasing the shear capacity of beams.

Keywords: CFRP, deep beams, openings in deep beams, strut and tie model, shear behaviour.

Digital Object Identifier (DOI):

Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 1286


[1] M. A. Mansur and T. K. Hwee, Concrete beams with openings analysis and design.
[2] Building code requirements for structural concrete (ACI 318-14), American Concrete Institute, 2014.
[3] K. Yang, H. Chung, E. Lee and, H. Eun, “Shear characteristics of high strength concrete deep beams without shear reinforcements,” Engineering Structures, vol. 25, no. 10, pp. 1343-1352, 2003.
[4] G. Rao, K. Kunal and R. Eligehausen, “Shear strength of RC deep beams”.
[5] B. P and H. Boduroglu, “Mechanical behaviour and nonlinear analysis of short beams using softened truss and direct strut and tie models,” Engineering Structures, vol. 27, no. 4, pp. 639-651, 2005.
[6] R. Khaldoun and A. Khaled, “Minimum transverse reinforcement in 65 MPa concrete beams,” ACI Structural Journal, vol. 101, pp. 872-878, 2004.
[7] A. Ashour and C. Morley, “Effectiveness factor of concrete in continuous deep beams,” Journal of Structural Engineering, vol. 122, no. 2, pp. 169-178, 1996.
[8] A. Ashour, “Shear Capacity of Reinforced Concrete Deep Beams,” Journal of Structural Engineering, vol. 126, no. 9, pp. 1045-1052, 2000.
[9] C. Tang and K. Tan, “Interactive Mechanical Model for Shear Strength of Deep Beams,” Journal of Structural Engineering, vol. 130, no. 10, pp. 1534-1544, 2004.
[10] G. Russo, R. Venir and M. Pauletta, “Reinforced concrete deep beams-shear strength model and design formula,” ACI Structural Journal, vol. 102, pp. 429-437, 2005.
[11] N. Nishitha and P. Kavitha, “Effect of openings in deep beams using strut and tie model method,” International Journal of Technical Research and Applications, vol. 3, no. 5, pp. 59-62, 2015.
[12] E. Prentzas, “Behaviour and reinforcement of concrete beams with large rectangular apertures,” in PhD Thesis University of Sheffield U.K, 1968, p. 230.
[13] M. Mansur and A. Hansnat, “Concrete beams with small openings under torsion,” Journal of the Structural Division, ASCE, vol. 106, pp. 2433-2447, 1979.
[14] N. Somes and W. Corley, “Circular openings in webs of continuous beams,” Shear in Reinforced Concrete, Vols. SP-42, pp. 359-398, 1974.
[15] M. Mansur, K. Tan and W. Wei, “Effects of creating an opening in existing beams,” ACI Structural Journal, vol. 96, no. 6, pp. 899-906, 1999.
[16] M. Mansur, K. Tan and W. Wie, “Design of reinforced concrete beams with circular openings,” ACI Structural Journal, vol. 98, no. 3, pp. 407-415, 2001.
[17] M. Mansur, T. K.H and S. Lee, “Design method for reinforced concrete beams with large openings,” ACI Journal, vol. 82, no. 4, pp. 517-524, 1985.
[18] S. C. Chin, F. M. Yahyah, A. K. DOH Shu Ing and W. K. Chong, “Experimental Study on Shear Strengthening of RC Deep Beams with Large Openings Using CFRP,” in International Conference on Architecture, Structure and Civil Engineering, Antalya, 2015.