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RE: Grade @ Anchor Bolts

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Nels

    The bottom nut will provide the bearing for the rod. The other nuts 
will do little. There effect would be similar to deformations on rebar when 
one end is welded to a big hanking (hanking- engineering term used by 
excarpenters ) member embedded in concrete.

Acie

-----Original Message-----
From:	Nels Roselund [SMTP:n.roselund(--nospam--at)worldnet.att.net]
Sent:	Friday, August 18, 2000 9:30 PM
To:	seaint(--nospam--at)seaint.org
Subject:	Re: Grade @ Anchor Bolts

Do multiple nuts on a threaded rod improve the anchorage performance?  I've
done that to develop a holddown into a grouted concrete block wall.

Nels Roselund
Structural Engineer


>> >With a head or nut (but no plate) at the end of the
>> embedment(s), the mode
>> >of failure on anchorage devices is a cone-type failure in
>> the concrete,
>> >assuming that limit state is the controlling limit state.
>> The intersection
>> >of cones often reduced the total strength of the embedment
>> group, but you
>> >can still count on a cone-type failure.
>> >
>> >With a plate at the bottom of the anchors, the mode of
>> failure is likely to
>> >change from a lot of individual cones to one big chunk
>> (technical term)
>> with
>> >a flat bottom. If so, and since this has less surface area,
>> it reduces the
>> >strength.
>> >
>> >Charlie



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