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Re: CONC Slab Uplift

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Stan-

The main purpose for the hairpins and developing tension ties well into the
slab is to resist the lateral thrust at the base of the rigid frames.  

Significant lateral shear forces can be developed at the base of the columns
(even under vertical load) and it must be resisted for the frame to act
properly. The normal assumption is that  the base of the column is restrained
against translation (it may or not be restrained against rotation, but that
was the thread two weeks ago on the list).  You must be able to find a  load
path for the column shear force for this assumption to be correct.  Uplift
forces must also be resisted, but it is more likely these will be resisted
directly by a footing or by the thickened slab edge (Uplift has been the past
week's thread).

To further your education and experience you might try calculating the forces
and see how you would develop them.  Most people are rather surprised at
their magnitude the first time they calculate them.

Bill Cain, SE
Albany, CA