Concrete Pad for Temporary Support

[shinerttu]

Hello,

I am looking to design some temporary supports to support a steel deck during construction. I would like to use some existing reinforced concrete pads (14'x14') as baseplates for my steel tube columns (48" diameter x 0.5" WT). I am looking for advice on which design standard/guide I should follow for design check of the concrete pads. I took concrete strutures in school, but never foundation design (recent graduate).

I have a max axial load of 1,100 kips, and a shear (wind load) of 7.5 kips. Do I treat the wind load as a live load, and therefore use u=1.2D+1.6L equation? Although the wind load is a "live" load, it does not make sense to me to treat it as a vertical load live load.

Should I use ACI 318 or ACI 360? Do I treat this as slab on grade? I would like to check for shear and flexure.Just hoping someone can point me to the correct ACI standard.

 

[Ron]

A sketch would be helpful.

How temporary is your structure? How will the columns be attached to the concrete slabs? Wind will produce uplift and overturning on the structure, which must be reacted by the slabs. Do you know the reinforcing in the slabs? Will it be sufficient for moments induced by overturning? How thick are the slabs? Are they of sufficient thickness to handle the shear from the column axial loads? Do the slabs have sufficient mass to resist the lateral shear you have noted, considering sliding friction?