Punching shear of a steel HSS column through flat slab
Punching shear of a steel HSS column through flat slab
(OP)
Hello guys,
We are designing a concrete flat slab supported by steel HSS columns with plates. Basically, the contractor (who is also the client) wants to have continuous steel columns (not interrupted at each level).
I have calculated the punching shear through the slab by checking the minimum steel plate dimensions (below the slab) to respect the shear resistance with the corresponding perimeter.
I am just wondering if having a continuous steel column can cause a problem in shear resistance? Think of the slab as having a hole at each column, filled by the steel column itself.
Thank you!
We are designing a concrete flat slab supported by steel HSS columns with plates. Basically, the contractor (who is also the client) wants to have continuous steel columns (not interrupted at each level).
I have calculated the punching shear through the slab by checking the minimum steel plate dimensions (below the slab) to respect the shear resistance with the corresponding perimeter.
I am just wondering if having a continuous steel column can cause a problem in shear resistance? Think of the slab as having a hole at each column, filled by the steel column itself.
Thank you!






RE: Punching shear of a steel HSS column through flat slab
Your critical perimeter may be only two sides of a rectangle. Also, is that column part of your LFRS? If so, how are you transferring loads to it?
RE: Punching shear of a steel HSS column through flat slab
RE: Punching shear of a steel HSS column through flat slab
RE: Punching shear of a steel HSS column through flat slab
RE: Punching shear of a steel HSS column through flat slab
The column isn't part of the LFRS: the slab is a diaphragm transferring the lateral loads to shear walls on the perimeter.
The slab is supported with a thick plate with studs (so far). I believe the reinforcement of the column strip will be put on each sides of the column, along with integrity. I was more concerned about punching shear at the moment, although anything related to reinforcement around the column is going to be delicate and critical, as steellion said.
I will check into lift slab procedure. Thanks for the heads up!
Any other thoughts on this detail? As I said, this is the first time I've seen something like that.
RE: Punching shear of a steel HSS column through flat slab
As long as you put plenty of longitudinal top reinforcement in both directions, it should not be a problem