Post tensioning between very stiff members
Post tensioning between very stiff members
(OP)
Does anyone know the effect of stiff members (say lift core) on post tensioning?
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Post tensioning between very stiff members
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RE: Post tensioning between very stiff members
Same as the effect on RC members plus about 10% but no one thinks about it for RC members .
The normal procedure would be to provide a pour strip in the slab between the 2 codes allowing the compression from the PT to get into the concrete. Then closely spaced reinfrocement (same as RC, about 200 centers) should be provided to give crack control for shrinkage etc.
RE: Post tensioning between very stiff members
Zambo
RE: Post tensioning between very stiff members
RC members between stiff elements experience nearly as much shortening induced stress as PT members from shrinkage and temperature etc. Everyone ignores it in their calculations and detailing.
Regarding "space" around the shaft, not normally. The tendons would normally be anchored into the shaft. Normally a pour strip will be placed somehwere between the 2 shafts at a logical low stress location such as near a point of contraflexure in a span (assuming there are multiple spans between the shafts). This allows the slab around each shaft to shorten towards the shaft it is connected to. The actual arrangement would be specific to each project.