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RE: Anchor Bolts in CMU

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Harold,
Yes, it is a bit troubling.  I was able to find a technical publication by
going through the NCMA website which contained a couple of examples to help
explain the ACI 530 criteria.  However, I think the procedure is a bit odd
and I still have some questions.  I am waiting to hear from an engineer with
NCMA next week after the holiday, when I will be able to pose those
questions.  What I was doing was trying to show that when a wood floor
system is being used to restrain a CMU basement wall that not in all
conditions is the anchor bolt value in the sill plate the governing factor.
Using the methodology (sp?) in the publication I was right.

Joseph R. Grill, PE  

-----Original Message-----
From: Harold Sprague [mailto:spraguehope(--nospam--at)hotmail.com] 
Sent: Friday, July 02, 2004 12:35 PM
To: seaint(--nospam--at)seaint.org
Subject: RE: Anchor Bolts in CMU

Joe,
I have always been troubled by the way the masonry people do what the do in 
the code development process.  Their methodology is no different than 
concrete.  Spacing and all.  The problem is when you assume f'm is the same 
as f'c.  I wish they would do some anchor research in this area.  I would 
use the same reductions as the ACI 318.

Harold Sprague


>From: "Joe Grill" <jgrill(--nospam--at)swiaz.com>
>Reply-To: <seaint(--nospam--at)seaint.org>
>To: <seaint(--nospam--at)seaint.org>
>Subject: Anchor Bolts in CMU
>Date: Wed, 30 Jun 2004 16:09:44 -0700
>
>I am looking at the anchor bolt requirements in ACI 530/02 and in 
>particular
>the shear requirements.  There are requirements for reduction of shear due
>to edge distance, but nothing is said about reduction for spacing.  The UBC
>had requirements for reductions for spacing less that 8 bolt diameters.  
>The
>commentary on the ACI document talks about a reduction for edge distance
>less that 12 bolt diameters due to developing a full cone.  I would assume
>that this would also apply to spacing even though the commentary only
>mentions edge distance.  Am I right?
>
>
>
>Thanks,
>
>Joseph R. Grill, PE
>
>
>
>
>

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