The source is 2nd ed. LRFD vol 2 p 11-57, table 11-3.
The purpose of larger bolt holes is to allow for perpetual contractor screw-ups
in placement of anchor bolts. The larger holes necessitiate plate washers.
While you're at it, you better update your Cb (beam bending coefficient)
ASD! Well, I never!.....................
--- Roger Turk <73527.1356(--nospam--at)compuserve.com> wrote:
> Table J3.1 of my ASD specs lists the diameter of an oversize hole for 3/4"
> bolts as 15/16 inch. If your book has 1-5/16 inch, you need to get an
> A. Roger Turk, P.E.(Structural)
> Tucson, Arizona
> Paul Franceschi wrote:
> >>What is the maximum oversize bolt hole diameter for a base plate subject to
> uplift? AISC allows 1-5/16" diameter holes for a 3/4" diameter bolt. This is
> larger than the dimension across the flat of a 3/4" diameter bolt of
> 1-1/8", and would seem to have a significant impact on the capacity of the
> connection. Limiting hole diameter to 1/16" oversize seems overly
> restrictive for field fit up with anchor bolts. How effective are hardened
> washers to transfer upfilt forces?<<
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