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http://dx.doi.org/10.9712/KASS.2015.15.1.057

Shear Strength of Externally Post-Tensioned Concrete Beams  

Lee, Swoo-Heon (University of Texas at Arlington)
Kang, Thomas H.K. (Dept. of Architecture & Architectural Engineering, Seoul National University)
Shin, Kyung-Jae (School of Architecture & Architectural Engineering, Kyungpook National University)
Publication Information
Journal of Korean Association for Spatial Structures / v.15, no.1, 2015 , pp. 57-64 More about this Journal
Abstract
This paper shows the test results of continuous reinforced concrete beams with external post-tensioning rods. Six three-span beams were prepared and tested to fail. Three beams were designed to have flexure-dominating behavior and the others to have shear-critical behavior. In each group, one beam without external post-tensioning rods was designated as a control beam and two beams had the external post-tensioning rods of 18 mm or 22 mm diameter. External post-tensioning rods were installed within an interior span of 6000 mm. They show V-shaped configuration because two anchorages were located at the top of interior supports and a saddle pin at mid-span was installed at the bottom of the beam. Test results show that the load and shear capacities of strengthened beams were increased when compared with the control beam. Additionally, the measured shear strength was compared with the strength predicted by ACI 318-11 code equations. The detailed ACI 318-11 equation predicted the measured shear strength and failure location of the continuous beam reasonably well.
Keywords
Post-Tensioned Concrete Beam; External Post-Tensioning; Steel Rod; Shear Strength;
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  • Reference
1 F. Matta, A. Nanni, A. Abdelrazaq, D. Gremel, R. Koch, "Externally Post-Tensioned Carb on FRP Bar System for Deflection Control", Construction and Building Materials, Vol.23, No.4, pp.1628-1639, 2009   DOI   ScienceOn
2 B.M. Phares, T.J. Wipf, F.W. Klaiber, A. Abu-Hawash, Y.S. Lee, "Strengthening of Steel Girder Bridge using FRP", Proceedings of the 2003 Mid-Continet Transportation Research Symposium, Ames, Iowa, 2003
3 K.H. Tan, C.K. Ng, "Effect of Shear in Externally Prestressed Beams", ACI Structural Journal, Vol.95, No.2, pp.116-128, 1998
4 S.T.K. Ng, K. Soudki, "Shear Behavior of Externally Prestressed Beams with Carbon Fiber-Reinforced Polymer Tendons", ACI Structural Journal, Vol.107, No.4, pp.443-450, 2010
5 D.K. Park, J.H. Lee, "Inelastic Nonlinear Analysis of Structures with Under-Tension System", Journal of the Korean Association for Spatial Structures, Vol.9, No.2, pp.91-97, 2009 (in Korean)
6 K.J. Shin, J.H. Lim, Y.S. Oh, J.H. Moon, "An Experimental Study on the Flexural Behaviour of RC Beams Strengthened with High-Strength Bars", Magazine of Concrete Research, Vol.59, No.7, pp.469-481, 2007   DOI   ScienceOn
7 K.J. Shin, S.H. Lee, "Flexural Behaviour of RC Beams Strengthened with High-Tension Steel Rod", Magazine of Concrete Research, Vol.62, No.2, pp.137-147, 2010   DOI   ScienceOn
8 ACI Committee 318, "Building Code Requirements for Structural Concrete (ACI 318-11) and Commentary", American Concrete Institute, Farmington Hills, MI, USA, 2011