steel construction - pull out force

[greznik91]

Hello,

Im designing a steel construction for cars.
Columns are anchored to the ground RC slab that is 250 mm thick.
Since I get large pullout forces in end columns (image bellow) im wondering should I made RC beam at the edge of a slab.
Reason for this is to get a larger self weight of RC slab where pullout forces are large (30 kN) and another reason for an edge beam is to be able to use longer anchors depths.

Collumn supports are modeled as pinned, connection between the column and beam is a moment connection.

What do you suggest?

thanks for help

 

[klaus.]

your frame has 2 rigid moment stiff corners....
I would do one of them as hinged ...will reduce some forces...also due to temperature

 

[JLNJ]

Yes, thicken the concrete to provide the dead load uplift resistance. If it gets too thick you can look at some drilled piers at the columns.

One way or the other you need to activate some reliable dead load.

 

[XR250]

You could also install some bottom bars in the slab to mobilize more of its dead load and to act like a reverse retaining wall footing. i.e. large toe, small heel
Probably easier to just add dead load