I'm sorry I missed some of this thread on anchor bolts.
At the risk of going over old ground, I am designing a foundation for my
brother's plant for a press machine from Verson. Their foundation
sketch is pretty lousy, e.g., they show a 3" diameter hooked anchor
bolt. The don't give the weight of the machine, what the loads are at
the bearing points, etc. I complained to my brother who has said that
he would pass my comments on to Verson.
In the meantime, I am trying to figure out what to design the anchor
rods for. If I assume an uplift (unlikely with a brake press) based on
the strength of the rod material (A36), I figure I need an end bearing
plate approx. 12" x 12" to keep my bearing pressure to 0.375*(3.0) =
1.125 ksi. I believe that the anchor rod is really intended to resist
shear and, hence, the bottom plate could be smaller. Verson, of course,
provides no information.
Does anybody have any comments on this specific issue/
Gary
Andrew Kester, P.E. wrote:
> Thanks to Harold, Bill and Suresh for your discussion on ACI anchor
> bolts. Though at first it is a bit against my engineering common
> sense, I know understand what you mean when you say that bearing
> plates can actually REDUCE the pullout strength of the anchor bolts.
> Very interesting, call me a flip flopper but I have been convinced,
> and will no longer specify the oversized washers or bearing plates,
> just an unnecessary additional expense, though tiny. FWIW, I always
> design based on only the bolt head or nut, and just treated the plate
> as a feather in my cap, but as it turns out that doesn't really help.
>
> Have a good weekend all,
> Andrew
>
> Andrew Kester, PE
> Principal/Project Manager
> ADK Structural Engineering, PLLC
> 1510 E. Colonial Ave., Suite 301
> Orlando, FL 32803
>
>
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