The Use of Prestressed Rubber Pads for Flexural Strengthening of Reinforced Concrete Bridge Pier
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Abstract
Repairing and strengthening damaged bridge piers with the loss of the cross-sectional area of the rebar due to rusting has been studied extensively. Several effective methods have been proposed and are widely used. However, most of the materials used for strengthening are quite expensive. Locally available and low-cost materials sometimes are more appropriate alternatives for structural reinforcement. This research aims to study flexural behavior of reinforced concrete bridge piers strengthened using prestressed rubber pads. Samples replicated existing piers of bridges under the responsibility of the Department of Highways were constructed. The percentage of rebars in the control specimen is 1.2%, equal to the minimum percentage of rebars in the existing bridge piers. Three samples were tested under flexure and axial load. Each test specimen had a different reinforcement quantity and approach consisting of 100% of the minimum steel reinforcement amount, 25% of the minimum steel reinforcement amount, and 25% of the minimum steel reinforcement amount along with prestressed rubber pads. The test results showed that strengthening of bridge piers using prestressed rubber pads can increase flexural strength by 46.5% and the analysis results from Response-2000 software provided the flexural capacities of the specimens relevant to those from the experiment.
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