Experimental Investigations on Punching Shear of Flat Slabs Made from Lightweight Aggregate Concrete

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Abstract

In the paper the results of experimental investigations concerning flat slabs made from reinforced lightweight concrete with sintered fly ash aggregate CERTYD were presented. In the research program 6 models made in a natural scale were included. The main variable parameter was slab longitudinal reinforcement ratio. The aim of investigation was the experimental verification of efficiency of double-headed studs as punching shear reinforcement. In the existing technical approvals such kind of reinforcement was allowed only in normal concrete slabs. It was demonstrated that double-headed studs can be an effective transverse reinforcement of lightweight aggregate concrete slabs. The use of double-headed studs resulted in increase in the ultimate load from 19% to 44%, depending on the slab reinforcement ratio which ranged from 0.5% to 1.2%. The comparative analysis showed that the Eurocode 2 provisions were conservative in relation to the experimental results, which were on average 42% higher than the theoretical ones however with a very low 7% coefficient of variation.

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  • 1. ACI 318-63 “Building code requirements for reinforced concrete (ACI 318-63)” American Concrete Institute Farmington Hills 1963.

  • 2. Caratelli A. Imperatore S. Meda A. Rinaldi Z. “Punching shear behavior of lightweight fibre reinforced concrete slabs” Composites Part B: Engineering V. 99 2016 pp. 257-265.

  • 3. Carmo R.N.F. Costa H. Rodrigues M. “Experimental study of punching failure in LWAC slabs with different strengths” Materials and Structures V. 49 No. 7 July 2016 pp. 2611-2626.

  • 4. Corley W.G. Hawkins N.M. “Shearhead Reinforcement for Slabs” ACI Journal Proceedings. V. 65. No. 10. October 1968 pp. 811-824.

  • 5. EN 1992-1-1:2004 “Eurocode 2: Design of concrete structures – Part 1-1: General rules and rules for buildings” European Committee for Standardisation Brussels 2004.

  • 6. European Technical Approval ETA-12/0454 “HALFEN HDB shear rail: Double-headed studs as punching reinforcement” Deutsches Institut für Bautechnik December 2012.

  • 7. Model Code 2010 “fib Model Code for Concrete Structures 2010. Final draft” Fédération internationale du béton October 2013.

  • 8. Hognestad E. Elstner R.C. Hanson J.A. “Shear Strength of Reinforced Structural Lightweight Aggregate Concrete Slabs”. ACI Journal Proceedings. V. 61. No. 6. June 1964 pp. 643-656.

  • 9. Ivy C.B. Ivey D.L.. Buth E: “Shear Strength of Lightweight Aggregate Reinforced Concrete Flat Slabs” ACI Journal Proceedings. V. 66 No. 6 June 1969 pp. 490-493.

  • 10. Marzouk H.. Osman M. Helmy S. “Behavior of High-Strength Lightweight Aggregate Concrete Slabs under Column Load and Unbalanced Moment” ACI Structural Journal V. 97. No. 6 November-December 2000 pp. 860-866.

  • 11. Marzouk H. Osman M. Hussein A. „Cyclic Loading of High-Strength Lightweight Concrete Slabs” ACI Structural Journal. V. 98 No. 2 March-April 2001 pp. 207-214.

  • 12. Osman M. Marzouk H. Helmy S. “Behavior of High-Strength Lightweight Concrete Slabs under Punching Loads” ACI Structural Journal V. 97. No. 3. May-June 2000 pp. 492-498.

  • 13. Urban T. Sitnicki M. “Badania eksperymentalne żelbetowych złączy płyt-słup wzmocnionych zbrojeniem poprzecznym typu ″Bauma″” XLIX Konferencja Naukowa KILiW PAN i KN PZITB 2003 pp. 87-94.

  • 14. Urban T. Sitnicki M. Tarka J. “Investigation of slab – column connections externally strengthened on punching” Report no 18 Department of Concrete Structures Lodz University of Technology Łódź 2012.

  • 15. Youm K-S. Kim J.J. Moon J. “Punching shear failure of slab with lightweight aggregate concrete (LWAC) and low reinforcement ratio” Construction and Building Materials V. 65 August 2014 pp. 92-102.

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