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Re: Grade @ Anchor Bolts

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Charlie,

Does the "chunk" behavior apply just to multiple anchor bolts connected to a
single plate or would it also apply to anchor bolts each having its own
individual plate (such as a plate washer) acting in group behavior?

David Finley, P.E.


-----Original Message-----
From: Charlie Carter <carter(--nospam--at)aiscmail.com>
To: 'seaint(--nospam--at)seaint.org' <seaint(--nospam--at)seaint.org>
Date: Friday, August 18, 2000 12:03 PM
Subject: RE: Grade @ Anchor Bolts


>>>...headed or threaded/nutted embedments
>>> can be fully developed with the head/nut only by selecting the proper
>>> embedment (length).....adding a plate at
>>> the bottom of the embedment introduced a plane of weakness in the
>concrete
>>> that REDUCED the strength of the embedment!
>
>>Can you (or someone else) please elaborate on this
>>particular topic / mode of failure?
>
>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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