Precracked reinforced concrete t-beams repaired in shear with prestressed carbon fiber-reinforced polymer straps


Type
Article
Change log
Authors
Dirar, S 
Lees, JM 
Morley, CT 
Abstract

The results of an experimental and numerical investigation involving unstrengthened reinforced concrete (RC) T-beams and precracked RC T-beams strengthened in shear with prestressed carbon fiber-reinforced polymer (CFRP) straps are presented and discussed. The results provide insights into the influence of load history and beam depth on the structural behavior of both unstrengthened and strengthened beams. The strengthened beams exhibited capacity enhancements of 21.6 to 46% compared to the equivalent unstrengthened beams, demonstrating the potential effectiveness of the prestressed CFRP strap system. Nonlinear finite element (FE) predictions, which incorporated the load history, reproduced the observed experimental behavior but either underestimated or overestimated the post-cracking stiffness of the beams and strap strain at higher load levels. These limitations were attributed to the concrete shear models used in the FE analyses.

Description
Keywords
beam, fiber-reinforced polymer, finite element, precracking, shear, straps, strengthening
Journal Title
ACI Structural Journal
Conference Name
Journal ISSN
0889-3241
1944-7361
Volume Title
110
Publisher
American Concrete Institute
Publisher DOI
Publisher URL