Pour strip on post tensioned slab
Pour strip on post tensioned slab
(OP)
i have one post tensioned slab with single tendon ( anchors on one side and the other side has a dead point )
so i ask of i need to make pour strip on the side which has dead point or not .and there is a water tank wall on this edge .
Also , what is the usefl of pour strip except p.t service .
Thanks
so i ask of i need to make pour strip on the side which has dead point or not .and there is a water tank wall on this edge .
Also , what is the usefl of pour strip except p.t service .
Thanks






RE: Pour strip on post tensioned slab
BA
RE: Pour strip on post tensioned slab
Should it has from two sides ?!
RE: Pour strip on post tensioned slab
Edit: The above is incorrect. See the post by Hokie66 for a better description.
A sketch of your slab showing anchorages and pour strip locations might be helpful.
BA
RE: Pour strip on post tensioned slab
Pour strips that I have seen have the anchorages at the pour strip and they are filled after stressing.
RE: Pour strip on post tensioned slab
So why we make a pour strip when we have a dead end of tendon .
And how can we cast the pour strip before stressing ?!
RE: Pour strip on post tensioned slab
RE: Pour strip on post tensioned slab
The purpose of delayed pour strips, whether in conventionally reinforced or post-tensioned slabs, is to reduce direct tension cracking due to restraint.
It would be an unusual situation to have a pour strip at the end of a stressed slab. Sometimes, the ends of slabs are supported on corbels with slide bearings, and the joint locked up later, but I wouldn't call that a "pour strip".
RE: Pour strip on post tensioned slab
We still need a drawing!
RE: Pour strip on post tensioned slab
RE: Pour strip on post tensioned slab
At this water tank walls the tendon is dead so i ask why we need to make a pour strip at this area
RE: Pour strip on post tensioned slab
RE: Pour strip on post tensioned slab
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.
RE: Pour strip on post tensioned slab
I wold normally agree but in this case, the moments are normally small, the support is continuous so no shear concentrations and often you can organise a shorter span into the walls so shear is much reduced as well due to the longer internal span effect on the shorter end span.
The thing people often forget with pour strips is that most of the shrinkage and all of the temperature movement restraint effects still exist as the pour strip is filled in after stressing, so the concrete is only a couple of weeks old and even if it is left for 2 months, there is only a small reduction in shrinkage and none in temperature (unless you can time the pour to late at night on a cold night in winter!!). I often think you are better off connecting it all up and providing crack control reinforcing for the restraint.
RE: Pour strip on post tensioned slab
Fair enough. Folks seem to get hung up on the shortening due to PT, not acknowledging that is only a small part of the axial problem.
RE: Pour strip on post tensioned slab
Yes, normally only 10-15% of the total shortening!