Effect of Post Tensioning on Long Span Precast Beam

Abstract

One of the strengthening strategies utilised after the loading stage and before failure is the use of unbounded
internal reinforcing bars. Post tensioning is a technique for strengthening reinforced concrete structures in
a variety of ways. The purpose of this paper is to look into the impact of using post-tensioned reinforcing
bars. On site, this approach of reinforcing a reinforced concrete beam with a span of 29 metres was tested.
Internal parabolic cable was attached to the beam at the level of internal flexural tension reinforcement to
strengthen it. The post tensioning of a 29-meter span beam is designed with nine span strands of 15.2 mm
diameter. Strand Fpu has been stressed up to 80% of its stressing capacity and has reached its maximal
stress of 1860 N/sq.m. This post tensioning beam is made out of M60 concrete. Hydraulic jack was used to
post-tension internal high tensile cable. The approach is also particularly effective for beams with smaller
percentages of internal flexural tension reinforcement, according to the findings.