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RE: OSHA 4-bolt column anchorage

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There is an exception to the 4-anchor bolt rule for "posts" vs
"columns".  See the definitions in 29 CFR 1926. 

William C. Sherman, PE 
(Bill Sherman) 
CDM, Denver, CO
Phone: 303-298-1311
Fax: 303-293-8236
email: shermanwc(--nospam--at)cdm.com
 

> -----Original Message-----
> From: Charley Hamilton [mailto:chamilto(--nospam--at)uci.edu] 
> Sent: Monday, February 06, 2006 11:43 AM
> To: seaint(--nospam--at)seaint.org
> Subject: Re: OSHA 4-bolt column anchorage
> 
> Dave -
> 
> Bill is right:  it's a federal OSHA ruling.  As far as I 
> understand, there are no exceptions in 29 CFR 1926.755.
> The rule can be found here:
> 
> http://www.osha.gov/pls/oshaweb/owadisp.show_document?p_table=
STANDARDS&p_id=12746
> 
> Take a look at osha.gov and search for "base plate anchorage".
> It brings up quite a bit of info about the why's and 
> wherefore's of the 4-bolt rule.  For example:
> 
> http://www.osha.gov/pls/oshaweb/owadisp.show_document?p_table=
FEDERAL_REGISTER&p_id=16290
> 
> Scroll down to "Section 1926.755 Column Anchorage" and you 
> can see some of the testimony that was offered.
> 
> Personally, I suspect it would be greater total cost to go to
> (e.g.) two bolts and guying to provide stability than to 
> simply design in the four bolts from the get-go.  Adding a 
> process (guying and un-guying each column) to the erection 
> seems like it would add cost, mostly through labor.  You 
> might save a bit on the labor of installing half the anchor 
> bolts, but that seems like less labor to me than installing 
> and removing the guys.  Also, it seems that the guys could 
> potentially be in the way during erection of the girders.
> 
> Just my $0.02,
> 
> Charley
> 
> -- 
> Charles Hamilton, PhD EIT               PGR
> Department of Civil and                 Phone: 949.824.3752
>      Environmental Engineering           FAX:   949.824.2117
> University of California, Irvine        Email: chamilto(--nospam--at)uci.edu
> 

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