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# RE: Anchor Bolts in Masonry

• To: <seaint(--nospam--at)seaint.org>
• Subject: RE: Anchor Bolts in Masonry
• From: "Joe Grill" <jgrill(--nospam--at)swiaz.com>
• Date: Thu, 18 Nov 2004 07:37:07 -0700

```Mathew,
I posted a question on this subject just a couple of weeks ago.  You might
check the archives for some of the replies.  Basically, yes you are right.
It gets even worse if you look at the separate definitions for Ap and Apt.
Scott Maxwell quoted an acquaintance of his who is on the committee that
agreed that the equation 2-4 is conservative, and if I remember correctly
2-4 could be ignored if minimum cover requirements are met that 2-3 would be
enough.  I won't try to remember the full quote word for word here, but
check the archives.  You are not the only one that has noticed this.
J. Grill

Joseph R. Grill, P.E. (Structural)
Shephard - Wesnitzer, Inc.
Civil Engineering and Surveying
1146 W. Hwy 89A Suite B
Sedona, AZ  86340
PHONE (928) 282-1061
FAX (928) 282-2058
jgrill(--nospam--at)swiaz.com

-----Original Message-----
From: Hood, Matthew O. [mailto:HoodMO(--nospam--at)ci.anchorage.ak.us]
Sent: Wednesday, November 17, 2004 12:04 PM
To: seaint(--nospam--at)seaint.org
Subject: Anchor Bolts in Masonry

I'm comparing the values for breakout of anchor bolts in tension using
ASD and LRFD and I'm coming up with a pretty large discrepancy. I'm
using ACI 530-02 which has

Ba=0.5*Ap*(f'm)^0.5 for ASD
and
Ban=4*phi*Apt*(f'm)^0.5 for LRFD with phi = 0.5

This would mean that the strength values are 4 times greater than the
ASD values. Am I missing something? Does anyone know why the difference
is so large?

Thanks for any input,
Matt

Matthew O. Hood, E.I.T.
Plan Review Engineer
Municipality of Anchorage
907-343-8451

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