Abstract
Concrete bridge structures require reinforcement, as their performance deteriorates over time. In this regard, this study evaluated the effect of additional prestressing using fiber-reinforced polymers (FRPs) and strands applied to a demolished, deteriorated bridge. In particular, specimens were prepared for a bridge subjected to non-, near-surface mounted (NSM), and external prestressing (EP) strengthening to evaluate the stiffness and safety of the structure. In the 200–400 kN load range, the EP method exhibited the highest stiffness (15 kN/mm), followed by non-strengthening (8.5 kN/mm) and the NSM method (5.45 kN/mm). The EP method increased the stiffness by approximately two times; however, the NSM method decreased the stiffness by 0.6 times. In the 400–800 kN load range, the EP and NSM methods yielded stiffness values of 2.58 and 0.7 kN/mm, respectively. These results confirm that the EP method reinforces the structure. The results of this study are expected to be used as basic data to reinforce deteriorated bridges in actual operation.
Highlights
Among reinforced concrete (RC) and prestressed concrete (PSC) structures, bridge structures have recently been exhibiting rapid performance degradation in terms of their usability and stability owing to the corrosion of steel [1,2]
Reinforcement is performed to restore or improve the mechanical performance of members or structures, such as their load-carrying capacity and stiffness [9]
Given that the performance of internal steel materials deteriorates over time in deteriorated bridges, an additional prestressing method can be applied for reinforcement to increase the stiffness of members, and the material substitution method can be adopted to prevent the corrosion of steel [9]
Summary
Among reinforced concrete (RC) and prestressed concrete (PSC) structures, bridge structures have recently been exhibiting rapid performance degradation in terms of their usability and stability owing to the corrosion of steel [1,2]. Given that the performance of internal steel materials deteriorates over time in deteriorated bridges, an additional prestressing method can be applied for reinforcement to increase the stiffness of members, and the material substitution method can be adopted to prevent the corrosion of steel [9]. The EP method increased the stiffness by approximately two times, but the NSM method decreased the stiffness by 0.6 times These strengthening methods were previously studied mainly based on models or small-scale structures. Polymers 2022, 14, 1115 but the NSM method decreased the stiffness by 0.6 times The results of this study could be used to develop a database that can be used dfoemr roeliinshfoerdc.eTmheenrtessautltcsoonfstrhuisctsitoundsyitceosuilndtbheeufusetudrteo. develop a database that can be used for reinforcements at construction sites in the future
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