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Re: Grade @ Anchor Bolts

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Bill,

Yes, the detail I used was an all-thread rod with spaced nuts (8" spacing).
The rod was extended vertically into the wall with the intention of
developing its tension load into the adjacent tension reinforcement.  My
thought was to make the load transfer relatively local and direct rather
than from a single zone at the bottom of the rod.

I'm not picturing what you mean about yielding of the vertical steel with
multiple bolt installations.  I don't like the idea of designing a threaded
rod to yield.  Yield in a threaded rod can only occur at the bases of the
threads -- it can't be uniformly distributed over a length of the rod --
that seems likely to be a brittle condition.

Nels Roselund
Structural Engineer

-----Original Message-----
From: Cain, William <bcain(--nospam--at)ebmud.com>

>Unless you are relying on yielding of the vertical steel with multiple bolt
>installations, I would be careful of a multiple nut configuration (assuming
>you mean they are spaced so that the cones don't overlap vertically) since
>the failure of a grouted concrete block wall shear cone would be a brittle
>failure.  If there is sufficient vertical steel, such a detail might be
o.k.
>
>Regards,
>Bill Cain, S.E.
>Oakland CA
>
>



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