Bond of Substandard Laps in Reinforced Concrete Beams Retrofitted with Post-Tensioned Metal Straps

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Title: Bond of Substandard Laps in Reinforced Concrete Beams Retrofitted with Post-Tensioned Metal Straps

Author(s): Yasser Helal, Reyes Garcia, Kypros Pilakoutas, Maurizio Guadagnini, and Iman Hajirasouliha

Publication: Structural Journal

Volume: 113

Issue: 6

Appears on pages(s): 1197-1208

Keywords: beams; bond strength; lap splices; post-tensioned metal strap confinement; reinforced concrete; retrofitting; splitting strength

Date: 11/1/2016

Abstract:
This paper investigates the bond-splitting performance of lapped steel bars in tension. Twelve reinforced concrete (RC) beams with substandard laps (lap length = 25 bar diameters) at midspan were tested in flexure. The variables examined include the bar diameter, concrete cover, and three different confinement conditions at midspan: 1) no confinement; 2) internal steel stirrups; and 3) external post-tensioned metal straps (PTMSs). The test results show that, in comparison to unconfined specimens, PTMS confinement enhances the bond strength of the lapped bars by up to 120%. Based on the results of this study, an innovative equation is proposed and validated to calculate the additional bond strength provided by PTMS confinement. The equation can be used for assessment and retrofit of substandard lapped bars in RC structures and should prove useful in practical retrofitting applications.