In-place Prestressed Concrete Beam Repair
In-place Prestressed Concrete Beam Repair
(OP)
Hello all,
I am working on a small bridge rehab project involving some deterioration on the undersides of some members of a adjacent box girder bridge. It spans over a tidal creek, and removal of the beams is not an option. The undersides of some of the beams show minor spall, however in 2 places, the bottom shear reinforcement is exposed. According to existing bridge plans, the prestressed strands appear to rest directly on the topside of the stirrups. I need to come up with a repair detail. My thoughts are that it would be better to not require exposing a large percentage of the stirrups (as typically required for a concrete repair) rather than risk exposing the prestressed strands. Any thoughts or suggestions??
Thanks alot,
Bob
I am working on a small bridge rehab project involving some deterioration on the undersides of some members of a adjacent box girder bridge. It spans over a tidal creek, and removal of the beams is not an option. The undersides of some of the beams show minor spall, however in 2 places, the bottom shear reinforcement is exposed. According to existing bridge plans, the prestressed strands appear to rest directly on the topside of the stirrups. I need to come up with a repair detail. My thoughts are that it would be better to not require exposing a large percentage of the stirrups (as typically required for a concrete repair) rather than risk exposing the prestressed strands. Any thoughts or suggestions??
Thanks alot,
Bob





RE: In-place Prestressed Concrete Beam Repair
RE: In-place Prestressed Concrete Beam Repair
RE: In-place Prestressed Concrete Beam Repair
www.SlideRuleEra.net
RE: In-place Prestressed Concrete Beam Repair
A ten per cent loss in cross sectional area would give a decrease of tensile strength in grade 60 rebar of 6 ksi x original area, and a similar ten per cent loss in prestressed strands area would decrease the strength 25-27 ksi x original area. (Probably a typo.)
RE: In-place Prestressed Concrete Beam Repair