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Effect of anchor bolts sleeve

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Is anyone aware of any research or publications which address the effects of
embedded steel sleeves on the pullout strength of steel anchor bolts?  If
the sleeve becomes too close to the embedded head, it seems that it would
affect the bearing at the head and overall pullout cone.  I do not see this
addressed in ACI 349, although one of the diagrams shows an "optional steel
or PVC sleeve".  (A contractor has submitted an equipment anchor bolt detail
which has a 6-inch embedment and a 4-inch deep steel sleeve.)  

William C. Sherman
Camp Dresser & McKee, Inc.
Denver, CO
Phone: 303-298-1311
Fax: 303-293-8236
email: shermanwc(--nospam--at)