Swimmer Bars as Shear Reinforcement in Reinforced Concrete Flat Slabs
AbdulQader S. Najmi1, Razan H. Marahlah2
1AbdulQader S. Najmi, Professor, Department of Civil Engineering , University University of Jordan, Amman, Jordan.
2Razan H. Marahlah, M.Sc. Graduate, Department of Civil Engineering, Amman, Jordan.
Manuscript received on 15 April 2015 | Revised Manuscript received on 25 April 2015 | Manuscript Published on 30 April 2015 | PP: 113-117 | Volume-4 Issue-4, April 2015 | Retrieval Number: D3906044415/15©BEIESP
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© The Authors. Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC-BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
Abstract: Punching shear failure takes the form of a truncated pyramid or truncated cone. A counteract steel cage truncated pyramid using swimmer bars will generate four inclined planes intercepting at perpendicular angles approximately the four inclined planes of the failure The swimmer bars themselves are a new type of shear reinforcement; these are short inclined bars welded to the steel rectangles forming the base and the top of the truncated steel cage pyramid. The number of steel cages needed depends on the thickness of the concrete plate, the grade of the concrete, and the size of the punching shear force. The results obtained from testing proved the effectiveness of this new system. The slope of swimmer bars may be used an extra parameter to force more than one steel cage truncated pyramid to resist punching shear force. The number of truncated pyramid-crack interceptor may be increased for heavy punching shear forces. The main advantage of this new system will enable the designers to use slabs with uniform economical thickness.
Keywords: Punching Shear, Swimmer Bars, Truncated Pyramid, Truncated Cones.
Scope of the Article: Concrete Engineering