Punching Shear Resistance of Reinforced Concrete Flat Slabs Strengthened by CFRP and GFRP: A Review of Literature
Engineering and Technology Journal,
2021, Volume 39, Issue 8, Pages 1281-1290
AbstractFlat reinforced concrete (RC) slabs or plates are still widely used in buildings and are most popular in single or multiple story floor construction systems. This is due to the ease and speed of implementation as well as the continuous smoothness that is provided in relation to the locations of members. Flat slab systems have an inadequate shear strength in both directions. Thus, they are subjected to a shear failure at their intersections with columns, which results in the collapse of a larger part of the structure. Shear failure occurs due to many reasons including changing the functions of the facility, the technical errors in the design and implementation procedures, an increase in the load, deterioration of materials, and poor quality. The carbon fiber reinforced polymer (CFRP) sheets/strips and glass fiber reinforced concrete polymer (GFRP) are used as a composite section formulated when there is a structural deficiency. Strengthening by using CFRP and GFRP provide an improvement in the punching shear resistance in both directions as well as flexural strength, ductility, and hardness. They are more suitable for a practical use as a substitute for other costly and difficult approaches such as increase the cross-sectional area of columns and so on. This paper reviews the up to date studies of enhancing the shear resistance of flat slabs by CFRP/GFRP and discusses the used materials for strengthening flat slabs and the used methods, which are used to implement these materials. Also, a summary for the cited studies are stated and the possible future works are suggested.
- Flat reinforced concrete slabs are widely used in buildings.
- Flat slab systems have inadequate shear strength in both directions.
- Strengthening by using CFRP and GFRP enhances the punching shear resistance.
- Recent studies of enhancing the shear resistance of flat slabs were reviewed.
 ACI Committee 440.1R-15, “Guide for the Design and Construction of Structural Concrete Reinforced with Fiber-Reinforced Polymer Bars”; American Concrete Institute: Detroit, MI, USA, 2015.
 Oehlers, D.J. and Seracino R., “Design of FRP and Steel Plated RC Structures: Retrofitting Beams and Slabs for Strength, Stiffness and Ductility”, Elsevier Ltd., 228pp, 2004.
 Alexander, S. and Simmonds S., “Shear-moment transfer in slab–column connections”. In Structural Engineering Report; University of Alberta: Edmonton, AB, Canada, pp. 95, 1989.
 Guandalini, S., Burdet, O.L., Muttoni A., “Punching tests of slabs with low reinforcement ratios”. ACI Struct. J., v. 106, 87–95, 2009.
 Silva, M.A.L., Madushanka, W.I., Ariyasena, P.S.I, Gamage, J.C.P.H, “Punching Shear Capacity Enhancement of Flat Slabs Using End Anchored Externally Bonded CFRP Strips”; Society of Structural Engineers: Colombo, Sri Lanka, 28, 2018.
 Rasha, T.S.M, Amr, B., Hany, A., “Effect of flexural and shear reinforcement on the punching behavior of reinforced concrete flat slabs”. Alex. Eng. J. vol. 56, 591–599, 2017.
 Al-Qraishi, H., “Detection of fibers content in UHPC slabs”. Eng. & Tech. Journal, vol.33, part(A), No.3, 720–728, 2015.
 Sayhood, E.K., Hamood, M.J., Abdul Ridha, A.A., “Punching shear resistance of reinforced concrete flat plate slabs strengthened with CFRP”. Eng. & Tech. Journal, vol.32, part(A), No.2, 511–529, 2014.
 Medhlom, M.K., “Punching shear behavior of fibrous self –compacting concrete flat slabs”. Eng. & Tech. Journal, vol.32, part(A), No.12, 2874–2890, 2014.
 ACI Committee 318M-318RM, “Building Code Requirements for Structural Concrete and Commentary”: American Concrete Institute: Detroit, MI, USA, 2019.
 British Standards Institution BS8110, “Structural Use of Concrete—Code of Practice for Design and Construction”, British Standards Institution, London, UK, 1997.
 European Committee for Standardization EN 1992-1-1, “ Eurocode 2: Design of Concrete Structures—Part 1-1: General Rules and Rules for Buildings; The European Union per Regulation 305/2011”, European Committee for Standardization, Brussels, Belgium, 2004.
 Canadian Standards Association CAN/CSA S806-12, “Design and Construction of Building Structures with Fiber-Reinforced Polymer”, Canadian Standards Association, Toronto, ON, Canada, 2012.
 Harajli, M.H. and Soudki, K.A., “Shear strengthening of interior slab–column connections using carbon fiber-reinforced polymer sheets”. J. Compos. Constr., vol. 7, 145–153, 2003.
 Sharaf, M.H., Soudki, K.A., Dusen, M.V., “CFRP strengthening for punching shear of interior slab–column connections”. J. Compos. Constr., vol. 10, 410–418, 2006.
 Radik, M.J., Erdogmus, E., Schafer, T., “Strengthening two-way reinforced concrete floor slabs using polypropylene fiber reinforcement”. J. Mater. Civ. Eng. ASCE, vol. 23, 562–571, 2011.
 Esfahani, M.R., “Effect of cyclic loading on punching shear strength of slabs strengthened with carbon fiber polymer sheets”. Int. J. Civ. Eng., vol. 6, 208–215, 2008.
 Abbas, H., Abadel, A.A., Almusallam, T., Al Salloum, Y., “Effect of CFRP and TRM strengthening of RC slabs on punching shear strength”. Lat. Am. J. Solids Struct., vol. 12, 1616–1640, 2015.
 El-Salakawy, E., Soudki, K.A., Polak, M.A., “Punching shear behavior of flat slabs strengthened with fiber reinforced polymer laminates”. J. Compos. Constr., vol. 8, 384–392, 2004.
- Article View: 211
- PDF Download: 253