CUED Publications database

Analysis of CFRP strap-strengthened reinforced concrete beams using the modified compression field theory (MCFT)

Yapa, HD and Lees, JM (2011) Analysis of CFRP strap-strengthened reinforced concrete beams using the modified compression field theory (MCFT). American Concrete Institute, ACI Special Publication, 1. pp. 541-560. ISSN 0193-2527

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Abstract

External, prestressed carbon fiber reinforced polymer (CFRP) straps can be used to enhance the shear strength of existing reinforced concrete beams. In order to effectively design a strengthening system, a rational predictive theory is required. The current work investigates the ability of the modified compression field theory (MCFT) to predict the behavior of rectangular strap strengthened beams where the discrete CFRP strap forces are approximated as a uniform vertical stress. An unstrengthened control beam and two strengthened beams were tested to verify the predictions. The experimental results suggest that the MCFT could predict the general response of a strengthened beam with a uniform strap spacing < 0.9d. However, whereas the strengthened beams failed in shear, the MCFT predicted flexural failures. It is proposed that a different compression softening model or the inclusion of a crack width limit is required to reflect the onset of shear failures in the strengthened beams.

Item Type: Article
Uncontrolled Keywords: Concrete beams Fibre reinforced polymer MCFT Shear
Subjects: UNSPECIFIED
Divisions: Div D > Structures
Depositing User: Cron Job
Date Deposited: 07 Mar 2014 12:06
Last Modified: 29 Nov 2014 19:03
DOI: