Shear Strengthening of Reinforced Concrete Beams Using External Anchored and Internal Bonded Steel Bars

Abstract

Existing concrete structures may require strengthening or stiffening in order to increase their structural performance. This paper presents the results of an experimental investigation for enhancing the shear capacity of reinforced concrete beams using two different techniques, external pre-tensioned stirrups and internal bonded vertical steel bars. A total of seven beams were tested in this program. All beams were designed to fail in shear mode; to assess the actual increase in shear strength by devised strengthening techniques. One of the beams was tested as control beam; whereas other beams were strengthened as the following. Two beams were strengthened with vertical internal epoxy bonded bars, two beams were strengthened with vertical internal epoxy bonded with end anchored bars, and two beams were strengthened with vertical externally anchored stirrups. All techniques were found to be effective in enhancing the shear strength of beams. However, the internal epoxy bonded and end anchored bars were found to be more effective than non anchored bars. Beams strengthened using this technique failed at a load almost 110 % higher than the control beam. The externally anchored steel stirrups provided an average of 100 % increase in shear capacity as compared to the control beam, while the internal epoxy bonded bars without mechanical anchors failed at a load 60% higher than the control beam.
Copyright © 2019 Praise Worthy Prize - All rights reserved.