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Re: Grade @ Anchor Bolts

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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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