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RE: Greasing headed anchor rods (is it necessary?)

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Cliff, 

I guess I'm with Daryl, I have been involved with many projects and have
not "greased" anchor bolts.  On many monopole "cell" tower
installations (where there are numerous anchor bolts, large diameter, in
a circular pattern) I have not witnessed "greased" anchor bolts.  I
guess my thought would be that what small "bond" strength that develops
would be quickly "broken" when full loading is applied and the situation
would reduce to loading the "head" of the anchor bolt anyway.  Check out
PCA's Strength Design of Anchorage to Concrete for some discussion on
the issue as well.

Robert Rogers, PE


-----Original Message-----
From: Clifford Schwinger [mailto:clifford234(--nospam--at)yahoo.com] 
Sent: Monday, April 14, 2003 11:18 AM
To: seaint(--nospam--at)seaint.org
Subject: Greasing headed anchor rods (is it necessary?)


When you have larger diameter headed anchor rods with
deep embedments (4 feet), is it a good idea to grease
straight shaft to de-bond the anchor rod from the
concrete in order to get the bolt tension down to the
base of the headed anchor where the real tensile load
transfer into the concrete is assumed to occur?
  
I am asking this for a condition where we have 1.5"
diameter F1554 Grade 105 anchor rods that resist some
pretty big tension forces from lateral loads.  Fatigue
loading is not a consideration and we are not
pre-tensioning the bolts.

Is it necessary to grease the bolt shaft or is this
just a waste of time - and grease?!

Thanks in advance for any insight anyone wishes to
share.

Cliff Schwinger


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