Punching Shear Strengthening of Reinforced Concrete Flat Plates Using Carbon Fiber Reinforced Polymers
This article has a reply.
VIEW THE REPLYThis article has a reply.
VIEW THE REPLYPublication: Journal of Structural Engineering
Volume 129, Issue 9
Abstract
This research presents a strengthening technique for increasing punching shear resistance in reinforced concrete flat plates using carbon fiber reinforced polymers (CFRPs). This strengthening method employs CFRP strips in the vertical direction as shear reinforcement around the concentrated load area in a specified pattern. Experimental load deflection curves, strain measurements, and failure modes are reported for four strengthened specimens and two reference specimens tested for the research reported here. The results show that, by using a sufficient amount of CFRP strips in an efficient configuration, the failure surface can be shifted away from the column. The load carrying capacities of the strengthened reinforced concrete slabs are increased with increasing amount of vertical CFRP reinforcement used in a wider area. Punching shear strengths of test specimens are augmented up to 51% relative to the control specimens. The pre- and postpunching behavior of the specimen with the highest increase in load carrying capacity is better than that of the reference specimen designed according to the current requirements of ACI 318-02. ACI 318-02 and CEB-FIP Model Code 90 requirements for punching shear design are critically examined in the light of current experimental findings.
Get full access to this article
View all available purchase options and get full access to this article.
References
American Concrete Institute (ACI). (1963). “Building code requirements for structural concrete.” ACI 318-63, Farmington Hills, Mich.
American Concrete Institute (ACI). (1989). “Building code requirements for structural concrete,” ACI 318–89, Farmington Hills, Mich.
American Concrete Institute (ACI). (2002). “Guide for the design and construction of externally bonded FRP systems for strengthening concrete structures.” Committee 440, Farmington Hills, Mich.
American Concrete Institute (ACI). (2002). “Building code requirements for structural concrete.” ACI 318-02, Farmington Hills, Mich.
Arduini, M., and Nanni, A.(1997). “Parametric study of beams with externally bonded FRP reinforcement.” ACI Struct. J., 94(5), 493–501.
Broms, C. E.(1990). “Punching of flat plates—A question of concrete properties in biaxial compression and size effect.” ACI Struct. J., 87(3), 292–304.
Broms, C. E.(2000). “Elimination of flat plate punching failure mode.” ACI Struct. J., 97(1), 94–101.
Comité Euro-International du Béton (CEB). (1985). “Punching shear in reinforced concrete—State of the art report.” Rep. No. 168, Lausanne, Switzerland.
Comité Euro-International du Béton–Fédération International de la Précontrainte (CEB-FIP). (1990). “Model Code 1990.” Bulletin D’Information No. 203–305, Lausanne, Switzerland.
Comité Euro-International du Béton–Fédération International de la Précontrainte (CEB-FIP). (2001). “Punching of structural concrete slabs.” Bulletin No. 12, Technical Rep., Lausanne, Switzerland.
Criswell, M. E. (1974). “Static and dynamic response of reinforced concrete slab-column connections.” ACI Publication No. SP-42, Shear in reinforced concrete, Farmington Hills, Mich., 721–746.
Ebead, U., and Marzouk, H.(2002). “Strengthening of two-way slabs using steel plates.” ACI Struct. J., 99(1), 23–31.
Elstner, R. C., and Hognestad, E.(1956). “Shearing strength of reinforced concrete slabs.” ACI Struct. J., 53(7), 59–29.
Farhey, D. N., Adin, M. A., and Yankelevsy, D. Z.(1995). “Repaired RC flat slab-column connection subassemblages under lateral loading.” J. Struct. Eng., 121(11), 1710–1720.
Grace, N. F., Soliman, A. K., Abdel-Sayed, G., and Saleh, K. R. (1999). “Strengthening of continous beams using fiber reinforced polymer laminates.” ACI Special Publication No. SP-188-57, Farmington Hills, Mich.
Hassanzadeh, G., and Sundqvist, H.(1998). “Strengthening of bridge slabs on columns.” Nordic Conc. Res., 1(21), 25–36.
Intelligent sensing for Innovative Structures (ISIS). (2000). “Strengthening reinforced concrete structures with externally-bonded fibre reinforced polymers.” No. ISI-M05-01, Winnipeg Man., Canada.
Kinnunen, S., and Nylander, H. (1960). “Punching of concrete slabs without shear reinforcement.” Trans., R. Inst. Technol., Stockholm, No. 158.
Malek, A. M., and Saasatmanesh, H.(1998). “Ultimate shear capacity of reinforced concrete beams strengthened with web-bonded fiber-reinforced plastic plates.” ACI Struct. J., 95(4), 343–352.
Menetrey, P.(1996). “Analytical computation of the punching strength of reinforced concrete.” ACI Struct. J., 93(5), 503–511.
Mosallam, A., Kreiner, J., Lancey, T., Haroun, M., and Elsanadedy, H. (2000). “Experimental and numerical analysis of two-way concrete slabs repaired with polymer composites.” ACUN-2 Int. Composites Conf., Univ. of New South Wales Sydney (also available at 〈www.srrs2.comlmosallam/conslab.html〉).
Oliveria, D. R., Melo, S. R., and Regan, P. E.(2000). “Punching strengths of flat plates with vertical or inclined stirrups.” ACI Struct. J., 97(3), 485–491.
Seible, F., Ghali, A., and Dilger, W. H.(1980). “Preassembled shear reinforcing units for flat plates.” J. Am. Concr. Inst., 77(1), 28–35.
Shehata, I. A. M., and Regan, P. E.(1989). “Punching in RC slabs.” J. Struct. Eng., 115(7), 1726–1740.
Triantafillou, T. C.(1998). “Shear strengthening of reinforced concrete beams using epoxy-bonded FRP composites.” ACI Struct. J., 95(2), 107–115.
Zhang, W. J., Teng, J. G., Wong, Y. L., and Lu, Z. T.(2001). “Behavior of two-way RC slabs externally bonded with steel plate.” J. Struct. Eng., 127(4), 390–397.
Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 129 • Issue 9 • September 2003
Pages: 1173 - 1182
Copyright
Copyright © 2003 American Society of Civil Engineers.
History
Received: Apr 4, 2002
Accepted: Nov 19, 2002
Published online: Aug 15, 2003
Published in print: Sep 2003
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.