Punching Shear Behavior of Fiber Reinforced Polymers Reinforced Concrete Flat Slabs: Experimental Study
Publication: Journal of Composites for Construction
Volume 7, Issue 3
Abstract
This paper presents the results of a two-phase experimental program investigating the punching shear behavior of fiber reinforced polymer reinforced concrete (FRP RC) flat slabs with and without carbon fiber reinforced polymer (CFRP) shear reinforcement. In the first phase, problems of bond slip and crack localization were identified. Decreasing the flexural bar spacing in the second phase successfully eliminated those problems and resulted in punching shear failure of the slabs. However, CFRP shear reinforcement was found to be inefficient in enhancing significantly the slab capacity due to its brittleness. A model, which accurately predicts the punching shear capacity of FRP RC slabs without shear reinforcement, is proposed and verified. For slabs with FRP shear reinforcement, it is proposed that the concrete shear resistance is reduced, but a strain limit of 0.0045 is recommended as maximum strain for the reinforcement. Comparisons of the slab capacities with ACI 318-95, ACI 440-98, and BS 8110 punching shear code equations, modified to incorporate FRP reinforcement, show either overestimated or conservative results.
Get full access to this article
View all available purchase options and get full access to this article.
References
Achillides, Z., Pilakoutas, K., and Waldron, P. (1997). “Bond behaviour of FRP bars to Concrete.” Proc., 3rd Int. Symp. on Non-Metallic (FRP) Reinforcement for Concrete Structures FRPRCS-3, Japan Concrete Institute, Sapporo, Vol. 2, 341–348.
American Concrete Institute (ACI). (1995) “Building code requirements for reinforced concrete and commentary.” ACI 318-95/ACI 318R-95, Detroit.
(ACI). (1998) “Provisional design recommendations for concrete reinforced with FRP bars.” ACI 440R-98, Farmington Hills, Mich., Draft 2, September, Sec. 6.5.
British Standards Institution (BS 8110). (1985) “Code of practice for design and construction.” British Standards Institution, Part 1, London.
Clarke, J. L. (1996). “Modification of design rules to incorporate non-ferrous reinforcement.” Rep. No. 1, Sir William Halcrow & Partners Ltd.
El-Ghandour, A. W. (1999). “Behaviour and design of FRP RC Slabs.” PhD thesis, Dept. of Civil and Structural Engineering, Univ. of Sheffield, UK.
El-Ghandour, A. W., Pilakoutas, K., and Waldron, P. (1997). “Behaviour of FRP reinforced concrete flat slabs.” Proc., 3rd Int. Symp. on Non-Metallic (FRP) Reinforcement for Concrete Structures FRPRCS-3, Japan Concrete Institute, Sapporo, Japan, October, Vol. 2, 567–574.
El-Ghandour, A. W., Pilakoutas, K., and Waldron, P., (1998). “Behaviour of FRP flat slabs with CFRP shear reinforcement.” Proc., 8th European Conf. on Composite Materials ECCM-8, I. Crivelli Visconti, ed., Naples, Italy, June, Vol. 2, 399–406.
El-Ghandour, A. W., Pilakoutas, K., and Waldron, P. (1999a). “Punching shear design of FRP reinforced concrete flat slabs.” TMR European Research Network ‘ConFibreCrete’ Seminar on Design Guidelines for FRP Reinforced Concrete Structures, Sintra, Portugal, January 18.
El-Ghandour, A. W., Pilakoutas, K., and Waldron, P. (1999b). “Development of design guidelines for FRP reinforced concrete.” Proc., 2nd Middle East Symposium on Structural Composites for Infrastructure Applications, A. Hosny, I. Mahfouz, and S. Sarkani, eds., Hurghada, Egypt, April, 200–213.
El-Ghandour, A. W., Pilakoutas, K., and Waldron, P. (1999c). “New approach for the punching shear capacity prediction of FRP RC flat slabs.” Proc., 4th Int. Symp. on Fibre Reinforced Polymer Reinforcement for Reinforced Concrete Structures, FRPRCS-4, Baltimore, October 31 to November 5, 135–144.
Institution of Structural Engineers. (1999). “Interim guidance on the design of reinforced concrete structures using fibre composite reinforcement.” The Institution of Structural Engineers, London.
Li, X. (1997). “Punching shear resistance of RC flat slabs.” PhD thesis, Dept. of Civil and Structural Engineering, The Univ. of Sheffield, UK.
Li, X., and Pilakoutas, K. (1995). “Alternative shear reinforcement in flat slabs.” Rep. No. CCC/94/0030A, Centre for Cement and Concrete, Dept. of Civil and Structural Engineering, The Univ. of Sheffield.
Matthys, S., and Taerwe, L. (1997). “Punching tests on concrete slabs reinforced with FRP grids.” Proc., 3rd Int. Symp. on Non-Metallic (FRP) Reinforcement for Concrete Structures (FRPRCS - 3), Japan Concrete Institute, Sapporo, Japan, October 14–16, Vol. 2, 559–566.
Pilakoutas, K., and Li, X. (2003). “Alternative shear reinforcement for reinforced concrete flat slabs.” J. Struct. Eng., in press.
Sheard, P. A., Clarke, J. L., Dill, M. J., Hammersley, G. P., and Richardson, D. M. (1997). “Eurocrete-taking account of durability for design of FRP reinforced concrete structures.” Proc., 3rd Int. Symp. on Non-Metallic (FRP) Reinforcement for Concrete Structures FRPRCS-3, Sapporo, Japan, October, Vol. 2, 75–82.
Information & Authors
Information
Published In
Copyright
Copyright © 2003 American Society of Civil Engineers.
History
Received: Feb 18, 2000
Accepted: Jul 10, 2000
Published online: Jul 15, 2003
Published in print: Aug 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.