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Volume Title: ICASGE2023

DOI: ICASGE-RCS

¹karim farouk ; ²Tamer El-Afandy; ¹Amr Abdel-Rahman

¹Structural Engineering Dept., Ain Shams University, Egypt

²Reinforced Concrete Structures (RCS)

Behaviour of strengthened inverted T-concrete bridge bent beams is investigated while the steel ledge reinforcement insufficient. An experimental program consisted of eight simply supported beams with 3.0 meters span was conducted. All beams had a total height of 500 mm and a web width of 180 mm. The height of the ledge part was 160 mm and its projection was 160 mm. Each beam was loaded at the mid span in order to study the behaviour of the inverted-T bent beams in case that the horizontal reinforcement of the bottom flange or the vertical stirrups of the web were insufficient. Strengthening of the inverted T-bent beams was investigated using different techniques. The aim of this study is to investigate the contribution of different strengthening schemes in the beam load carrying capacity, deflection and ductility. A large experimental program was conducted including two specimens with under-designed amount of steel hangers-, four specimens with under-designed amount of steel at the ledge and two specimens with under-designed amount of reinforcement at both the hangers and at the ledge, were constructed. This paper presents the experimental results of four strengthened specimens, two specimens with under-designed amount of steel hangers and two specimens with under-designed amount of reinforcement at both the hangers and at the ledge. The obtained results showed an increase in the load carrying capacity up to 44.0%. Recommendations and design guidelines of inverted –T bent beams are introduced.

Bottom flange; Hangers; Ledge; Inverted-T; Bent beam; strengthening; bridges

Reinforced Concrete Structures (RCS)