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conn. new reinf. conc slab with exist. con. pad

conn. new reinf. conc slab with exist. con. pad

conn. new reinf. conc slab with exist. con. pad

(OP)
Hello,
I am a new engineer (graduated May 2002) so everything I am working on is new to me.  My question is related to a slab that I am designing to hold a "pre-engineered" building, a set of rails, and to eventually be simply a concrete paved parking lot.  My slab will sit around an existing pad supporting a diesel generator (the new slab forms a U-shape around the existing).  The wall of the building will cross both the new and the existing slab.  I am not sure of the column spacing, as a different group is taking care of acquiring it through a bid process, but I believe that a column will be sitting within the existing pad.  Should I use a shear bar of some kind to link the pad and my slab together, or would it be better to simply leave it as just a jointed connection?  Any guidance is greatly appreciated.

RE: conn. new reinf. conc slab with exist. con. pad

You could do either, depending on how you wish to design your structure over the top.  A word of caution: be sure to provide a movement joint through your structure directly above the interface between new and old foundations if you do not structurally connect them together.

RE: conn. new reinf. conc slab with exist. con. pad

(OP)
Thank you for responding.  I am researching dowel installation now.  I hadn't even thought about the effects on the structure.  This is going to be a "temporary" building--but it is going to be temporary for 5 years in southern Kentucky.  So, it and the slab will definately undergo thermal expansion and contraction.  Thank you for bringing that to my attention.  I am open to any tips and insights anyone is willing to pass on!!

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