Failure Assessment of Lightly Reinforced Floor Slabs. I: Experimental Investigation
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Abstract
This paper is concerned with the ultimate behavior of lightly reinforced concrete floor slabs under extreme loading conditions. Particular emphasis is given to examining the failure conditions of idealized composite slabs which become lightly reinforced in a fire situation as a result of the early loss of the steel deck. An experimental study is described which focuses on the response of two-way spanning floor slabs with various materials and geometric configurations. The tests enable direct assessment of the influence of a number of key parameters such as the reinforcement type, properties, and ratio on the ultimate response. The results also permit the development of simplified expressions that capture the influence of salient factors such as bond characteristics and reinforcement properties for predicting the ductility of lightly reinforced floor slabs. The companion paper complements the experimental observations with detailed numerical assessments of the ultimate response and proposes analytical models that predict failure of slab members by either reinforcement fracture or compressive crushing of concrete.
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Acknowledgments
Funding provided by the UK Engineering and Physical Sciences Research Council (EPSRC) under Grant No.EPSRC-GBEP/C511204 for the work described in this paper is gratefully acknowledged. The writers would also like to thank the technical staff of the structures laboratories at Imperial College London, particularly Trevor Strickland, for assistance with the experimental work.
References
Bailey, C. G. (2004). “Membrane action of slab/beam composite floor systems in fire.” Eng. Struct., 26(12), 1691–1703.
Bailey, C. G., and Moore, D. B. (2000a). “The structural behavior of steel frames with composite floor slabs subject to fire. Part 1: Theory.” Struct. Eng., 78(11), 19–27.
Bailey, C. G., and Moore, D. B. (2000b). “The structural behavior of steel frames with composite floor slabs subject to fire. Part 2: Design.” Struct. Eng., 78(11), 28–33.
Bailey, C. G., and Toh, W. S. (2007). “Small-scale concrete slab tests at ambient and elevated temperatures.” Eng. Struct., 29(10), 2775–2791.
Bailey, C. G., White, D. S., and Moore, D. B. (2000). “The tensile membrane action of unrestrained composite slabs under fire conditions.” Eng. Struct., 22(12), 1583–1595.
Brotchie, J. F., and Holley, M. J. (1971). “Membrane action in slabs.” Publication SP-30: Cracking, deflection, and ultimate load of concrete slab systems, American Concrete Institute, 345–377.
Cashell, K. A. (2009). “Ultimate behavior of floor slabs under extreme loading conditions.” Ph.D. thesis, Imperial College London, London, UK.
Cashell, K. A., Elghazouli, A. Y., and Izzuddin, B. A. (2009). “Ultimate behavior of idealized composite floor elements at ambient and elevated temperature.” Fire Technol., 46(1), 67–89.
Cashell, K. A., Elghazouli, A. Y., and Izzuddin, B. A. (2010). “Experimental and analytical assessment of ductility in lightly reinforced concrete members.” Eng. Struct., 32(9), 2729–2743.
Cashell, K. A., Elghazouli, A. Y., and Izzuddin, B. A. (2011). “Failure assessment of lightly reinforced floor slabs. II: Analytical studies.” J. Struct. Eng., 137(9), 989–1001.
Elghazouli, A. Y., and Izzuddin, B. A. (2001). “Analytical assessment of the structural performance of composite floors subject to compartment fires.” Fire Saf. J., 36(8), 769–793.
Elghazouli, A. Y., and Izzuddin, B. A. (2004a). “Failure of lightly reinforced concrete members under fire. II: Parametric studies and design considerations.” J. Struct. Eng., 130(1), 18–31.
Elghazouli, A. Y., and Izzuddin, B. A. (2004b). “Realistic modeling of composite and reinforced concrete floor slabs under extreme loading. II: Verification and application.” J. Struct. Eng., 130(12), 1985–1996.
EN ISO 15630-1. (2002). Steel for the reinforcement and prestressing of concrete—Test methods—Part 1: Reinforcing bars, wire rod, and wire, ISO, Geneva.
Foster, A. J., Bailey, C. G., Burgess, I. W., and Plank, R. J. (2004). “Experimental behavior of concrete floor slabs at large displacements.” Eng. Struct., 26(9), 1231–1247.
Izzuddin, B. A., Tao, X. Y., and Elghazouli, A. Y. (2004). “Realistic modeling of composite and reinforced concrete floor slabs under extreme loading. I: Analytical method.” J. Struct. Eng., 130(12), 1972–1984.
Johanson (1943). Yield line theory [translated from German], Jul. Gjellerups Forlag, Copenhagen.
Kirby, B. R. (1997). “British steel technical European fire test programme—Design, construction and results.” Fire, static and dynamic tests of building structures, G. Armer and T. O’Dell, eds., Spon Press, London.
O’Connor, M. A., and Martin, D. M. (1998). “Behavior of multistory steel framed buildings subjected to fire attack.” J. Constr. Steel Res., 46(1–3), 295
Omer, E., Izzuddin, B. A., and Elghazouli, A. Y. (2010). “Failure of unrestrained lightly reinforced concrete slabs under fire, Part I: Analytical models.” Eng. Struct., 32(9), 2631–2646.
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© 2011 American Society of Civil Engineers.
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Received: Oct 18, 2010
Accepted: Apr 18, 2011
Published online: Apr 20, 2011
Published in print: Sep 1, 2011
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