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Fw: Steel-Detail: Re: Erecting Steel Braced Frames with Bolted Connections

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> From: Glenn Barefoot <rgbare(--nospam--at)mindspring.com>
> To: Fountain Conner <fconner(--nospam--at)pcola.gulf.net>
> Subject: Re: Steel-Detail: Re: Erecting Steel Braced Frames with Bolted
Connections
> Date: Friday, June 25, 1999 9:22 AM
> 
> Mr. Conner,
> i have to agree with some of the other replies i have read in regards to
> this message.  i have done many sets of bolted bracing in the past 15
years.
> the majority  of these sets went up with out a glitch; however, the few
that
> did have problems were not a result from mill tolerances.  the problems i
> usually encounter are poor site conditions or fab errors.  for instance:
if
> the anchor bolts are off more than 1/2" center to center, it will start
to
> throw off the geometry of the bracing.  also, many fabricators are using
cnc
> equipment to punch the beams, columns and gusset plates.  unless the
> fabricator has skilled layout men back-checking the cnc punched parts, it
is
> possible to introduce errors in the fab area.  as bad as i hate to say
it, i
> have made mathematical errors too.  as far as letting the erector have
the
> option of welding vs bolting, i try to steer clear of field welding
bracing
> because it is difficult to get good welds in awkward positions.  i hope
this
> kinda helps.
> R. Glenn Barefoot
> BCD Drafting, INC.