Techno Press
You logged in as

You have a Free online access/download for a limited time.
Advances in Concrete Construction   Volume 2, Number 4, December 2014, pages 281-300
DOI: https://doi.org/10.12989/acc.2014.2.4.281
 
Shear strengthening of reinforced concrete beams with rectangular web openings by FRP Composites
Ahmed H. Abdel-Kareem

 
Abstract     [Full Text]
    This study presents the experimental results of twenty three reinforced concrete beams with rectangular web openings externally strengthened with Fiber Reinforced Polymers (FRP) composites bonded around openings. All tested beams had the same geometry and reinforcement details. At openings locations, the stirrups intercepted the openings were cut during fabrication of reinforcement cage to simulate the condition of inclusion of an opening in an existing beam. Several design parameters are considered including the opening dimensions and location in the shear zone, the wrapping configurations, and the amount and the type of the FRP composites in the vicinity of the openings. The wrapping configurations of FRP included: sheets, strips, U-shape strips, and U- shape strips with bundles of FRP strands placed at the top and sides of the beam forming a fan under the strips to achieve closed wrapping. The effect of these parameters on the failure modes, the ultimate load, and the beam stiffness were investigated. The shear contribution of FRP on the shear capacity of tested beams with web openings was estimated according to ACI Committee 440-08, Canadian Standards S6-06, and Khalifa et al. model and examined against the test results. A modification factor to account for the dimensions of opening chords was applied to the predicted gain in the shear capacity according to ACI 440-08 and CSA S6-06 for bonded Glass Fiber Reinforced Polymers (GFRP) around openings. The analytical results after incorporating the modification factor into the codes guidelines showed good agreement with the test results.
 
Key Words
    GFRP; CFRP; shear strengthening; rectangular web opening; concrete beam
 
Address
Ahmed H. Abdel-Kareem: Department of Civil Engineering, Benha faculty of engineering,
Benha university, Egypt
 
References
    -acc0204003-
 

Techno-Press: Publishers of international journals and conference proceedings.       Copyright © 2020 Techno Press
P.O. Box 33, Yuseong, Daejeon 305-600 Korea, Tel: +82-42-828-7996, Fax : +82-42-828-7997, Email: technop@chol.com