Slab Penetration in Center of Column Strip
Slab Penetration in Center of Column Strip
(OP)
I have a slab penetration that the architect wants to slap directly between two columns. Bay spacing is approximately 20'-0" x 29'-0", penetration would be located in a column strip-middle strip intersection. I took a look at the ACI slab opening provisions, 13.4, and I cannot use the prescriptive methodology here because I interrupt more than 1/4 of the reinforcement in the middle strip.
How do you usually analyze the design strips for this opening? Since the calculated moments are usually averaged over the width of the strip, is it accurate to calculate the required reinforcement assuming a decreased strip width due to the opening. Add 50% of the interrupted reinforcement each side of the opening and add any additional bars required for strength?
How do you usually analyze the design strips for this opening? Since the calculated moments are usually averaged over the width of the strip, is it accurate to calculate the required reinforcement assuming a decreased strip width due to the opening. Add 50% of the interrupted reinforcement each side of the opening and add any additional bars required for strength?






RE: Slab Penetration in Center of Column Strip
RE: Slab Penetration in Center of Column Strip
BA
RE: Slab Penetration in Center of Column Strip
RE: Slab Penetration in Center of Column Strip
RE: Slab Penetration in Center of Column Strip
It's Friday - play with him and have some fun with this one.
Mike McCann
MMC Engineering
RE: Slab Penetration in Center of Column Strip
I have used RAM Concept to analyze the slab, but although it is a FEA program, it averages the stresses within the strip, so essentially I receive an extra #6 bar. Not too much to sneeze at. Another engineer in the office has major concerns concerning the required continuity bars extending through the column zones. But in my opinion, this interruption occurs all the time at elevator, stair openings, etc.
RE: Slab Penetration in Center of Column Strip
RE: Slab Penetration in Center of Column Strip
RAM concept's reinforcing mindset is strip based, despite it being a 3D package, hence you shouldn't expect it to choose particularly good reo arrangement for you.
RE: Slab Penetration in Center of Column Strip
RE: Slab Penetration in Center of Column Strip
RE: Slab Penetration in Center of Column Strip
RE: Slab Penetration in Center of Column Strip
How does Adapt go as a FEA concrete package, I have never used it.