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@M.Arslan Umar I attach two sketches which I did over my tea break: 1. Shows the steel column supporting a flat slab (flat plate) with no down stand beams. 2. Shows steel column with welded steel cantilever 750mm long beams cast within slab depth - no down stand beams. You can also carry the column above to the next slab level up. Structural Engineer - key design decisions 1. What design code am I designing to? ACI or Eurocode - follow their procedure for flat plate / flat slab design. 2. Make sue slab is deep enough to house steel sections. 3. The key thing with flat slab design to make sure there is shear links/stirrups in slab around the column - again follow code procedure! Sadly, Pakistan does not have code; Many practicing Engineers follow American codes - different versions ACI 318-19; ACI 318-11 etc. I prefer to use the Eurocodes - easier to follow for practical design! Sadly, in Pakistan we are obsessed with US stuff - status thing I think. Sorry about poor quality of sketches... done on the kitchen table on paper hand towels!

The situation here is very similar to where foundations are placed on steel piles (although there is no continuity for piles to top like columns can have another column on top of slab). I can explain to you what is done for the pile connection. Normally a cap plate is used on top of the pile and dowels are welded to the cap plate that get embedded in the foundation concrete. The dowels can be designed for shear and tension forces (Moment is resolved into tension). I haven't done a configuration in slab but for piles, I have done a lot of these. Regards, Makhzumi.

If you are in Pakistan then i would be tempted to use "Precast Concrete Columns" rather than Steel Columns due to limited availability of heavy sections; Steel Sections are used for speed on construction. Nevertheless: I have designed a steel column / concrete flat slab (plate) configuration previously. This is your best course of action: 1. Decide which "design code" you will use for the design, and follow its procedure for slab shear check; This is key; 2. The steel columns will require short cantilever sections coming out into slab; 3. Make sure you can feed reinforcement through the steel section or above and below it and get adequate concrete cover; 4. Check slab shear - you will require lines of shear (vertical) reinforcement within slab, successive perimeters, around the column; Slab shear check around column is key!