Re: PEMB foundation uplift

How far can your concrete tie/slab/perimeter cantilever? You shouldn't use more than that.  I've used the perimeter turn down that way in the past, though I generally omit any more concrete than is directly over the footings, as it has very little moment capacity.

Jordan

Truitt Vance wrote:

Looking for some opinion here:

 

I am designing the pads under some columns on a steel PEMB for uplift:

 

Is it common to use the dead weight for a reasonable length of the tie beams intersecting the pads under the columns of a PEMB?  Is it common to use the weight contribution from a reasonable area of the slab?

 

If yes, how would you justify that with calcs?  (ie: “FBD cut at the location where you assumed the contribution of dead weight ended and design for the self weight?)

 

Thank you in advance,

 

Truitt Vance, P.E.