Contribution of Externally Bonded Steel Plate Reinforcement to the Shear Resistance of Reinforced Concrete Beams

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Title: Contribution of Externally Bonded Steel Plate Reinforcement to the Shear Resistance of Reinforced Concrete Beams

Author(s): R. Narayan Swamy, Roy Jones, and Abdelhamid Charif

Publication: Special Publication

Volume: 165

Issue:

Appears on pages(s): 1-24

Keywords: adhesives; beams (supports); plates (structural members); reinforcing steels; shear properties; shear strength; tension; web reinforcement; Structural Research

Date: 12/1/1996

Abstract:
Although some test data are available on the behavior of reinforced concrete beams with bonded plates in shear, there is still considerable lack of information on the effectiveness of such plates in resisting shear forces. This paper presents the results of the first stage of a comprehensive study to evaluate the role and mechanism of strengthening in shear when bonded steel plates are used either at the tension face or in the webs. The major variable in this study was the shear span-effective depth ratio, which is the critical parameter for shear failures; two different geometries of web plates were used. The effect of these bonded plates on deformations, cracking, failure loads, and mode of failure are presented and discussed. Bonded plates at the tension face enhanced the flexural stiffness of the original beams which were weak in shear, but their influence in enhancing shear behavior was minimal. Bonded web plates, on the other hand, were very effective in upgrading the structural behavior in shear. However, the latter were unable to reach their full load capacity due to shear cracking in the unreinforced part of the webs and the consequent debonding of the web plates.