Abstract
Wide-shallow beams are commonly used in bridges, and in most cases their collapse is governed by the shear failure. Accordingly, previous research was based on studying how to strengthen the wide beams in the shear, using different methods, most of which were internal modifications, whether in the stirrups or with special additives to the concrete used. This paper provides a new technique for shear strengthening of wide beams, and for this purpose, an experimental program with thirteen specimens is considered. The proposed technique relied mainly on the use of internal and external fasteners, whether vertical or inclined in the shear span zones of specimens. The effect of using a single steel plate instead of steel angles on the process of fixing fasteners was also studied. Cracking patterns, ultimate loads, failure mechanisms, load–deflection and load–strain relationships were investigated for the beam specimens. The results indicated that the proposed technique is a very effective strengthening method and enhances the shear capacity. In addition, a proposed analytical formula is suggested to calculate the effect of the new strengthening technique for wide-shallow beams and showed good agreement.
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