Steel column block-out at post-tension slab-on-grade
Steel column block-out at post-tension slab-on-grade
(OP)
The slab-on-grade is post-tensioned. It will be poured together with the column spread footing. Architect preferred the steel column has a regular block-out so the base plates, grout, and anchor bolts can be hided. But to do that, the tendon of the slab will need to cut/stop at the block-out area. That means the slab at column strips is not post-tensioned. Is it OK? Thanks a lot for your help.






RE: Steel column block-out at post-tension slab-on-grade
why are you pouring the footing and slab together?
How could you do anything so vicious? It was easy my dear, don't forget I spent two years as a building contractor. - Priscilla Presley & Ricardo Montalban
RE: Steel column block-out at post-tension slab-on-grade
The post-tensioned slab engineer wanted to pour the interior footing and slab together maybe because it is convenient and faster to construct. Do you see a problem with this? My only concern is, will the post-tensioned tendons in slab cause a uplift force on my footing?
My other concern is, I want to use the slab/soil friction to take my large base shear at the column. If I have a 8" deep cloumn block out, the top of the 5" thick slab is 8" higher than the interface of the anchor bolt to the footing (which is the top of the footing). Can I add L shape dowels from the footing to the slab turn-down around the block-out and say the base shear is transfered to the slab?
RE: Steel column block-out at post-tension slab-on-grade
How could you do anything so vicious? It was easy my dear, don't forget I spent two years as a building contractor. - Priscilla Presley & Ricardo Montalban
RE: Steel column block-out at post-tension slab-on-grade
Or you don't use the slab to take the base shear? So you have a column block-out with expansion joint around. The slab just has turn-downs sitting on the footing?
RE: Steel column block-out at post-tension slab-on-grade
Or you don't use the slab to take the base shear? So you have a column block-out with expansion joint around. The slab just has turn-downs sitting on the footing and there are no dowels from the footing to the slab?
RE: Steel column block-out at post-tension slab-on-grade
How could you do anything so vicious? It was easy my dear, don't forget I spent two years as a building contractor. - Priscilla Presley & Ricardo Montalban
RE: Steel column block-out at post-tension slab-on-grade