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Hollow core slab

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dgkhan

Structural
Jul 30, 2007
322
I have a situation here where we need to remove and rebuild existing wall supporting (simply supported) 20 feet span, 8" Hollow core roof slab. I need to see if we shore the PC slab 4 feet away from wall, it will work and not crack etc. Also is there any way I can model it is STAAD.
 
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You need to define whether there will be LL on the roof. I suggest contacting the precaster for his advice.
 
cant you just determine the max moment with or without live load, live load on the cantilever only, then check it against the section to see if it cracks?
 
jrisebo,

That method doesnt work as the post tensioning will be working against you and increasing the cantilever moment.

dgkhan,

If they can reduce it down to a 2' cantilever and there is no loading on the end then I wouldnt expect it to be a problem. At 4' I would want more info on the planks.
 
Is the post tensioning really doing much at the ends, I agree with csd72, 2' shouldnt be a problem.
 
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