Helal, Yasser, Garcia, Reyes, Pilakoutas, Kypros, Guadagnini, Maurizio and Hajirasouliha, Iman (2016) Bond of substandard laps in reinforced concrete beams retrofitted with post-tensioned metal straps. ACI Structural Journal, 113 (6). pp. 1197-1208. ISSN 0889-3241.

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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.

Item Type:	Journal Article
Divisions:	Faculty of Science, Engineering and Medicine > Engineering > Engineering
Journal or Publication Title:	ACI Structural Journal
Publisher:	American Concrete Institute
ISSN:	0889-3241
Official Date:	1 November 2016
Dates:	Date Event 1 November 2016 Published 15 April 2016 Accepted
Volume:	113
Number:	6
Page Range:	pp. 1197-1208
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Date of first compliant deposit:	7 December 2018

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