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RE: old beams

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Light Beam
A-4.86
d-12.00
b-4.00
t-.269
w-.230
Ix-105
Sx-17.5
rx-4.65
Zx-20.6


Dave



-----Original Message-----
From: Brian K. Smith [mailto:smithegr(--nospam--at)bellsouth.net]
Sent: Thursday, April 24, 2003 11:41 AM
To: seaint(--nospam--at)seaint.org
Subject: old beams


I am adding some RTUs and suspended transformers to an old structure.  Some
of the beams are noted as 12B16.5.  If anyone can send me the properties of
these beams I would greatly appreciate it.

Brian K. Smith, P.E.




> -----Original Message-----
> From: Andrew D. Kester [mailto:andrew(--nospam--at)baeonline.com]
> Sent: Wednesday, April 23, 2003 1:14 PM
> To: seaint(--nospam--at)seaint.org
> Subject: steel costs
>
>
> I have browsed through the AISC tips on economics, but some of them are a
> bit old and I was just wondering if the following rules of thumb
> still apply
> and if people agree:
>
> -Avoid stiffeners as much as possible, extra fabrication and welding. An
> increase in the size to avoid them is worth the cost of the steel.
> -If I have a small project with say, 10 steel beams or less, I
> should try to
> use the same shape whether it is way more then required or not. This way a
> fabricator can pull one shape of steel and cut from it several
> pieces rather
> then several. Also this will make doing connections easier and
> more uniform,
> and avoid field confusion.
> -Avoid all around welds when not needed by design. Go with a 3"
> weld top and
> bottom for instance instead of 6" on all four sides... This would
> especially
> apply to columns with small uplift forces. (Our typical details
> always show
> a weld all around on a TS to BP connection.)
> -Try to use bearing bolt connections vs SC.
>
> -How much more is an in-field web connection vs bolt (%)?
>
> -Are tube steels any more then W shapes per pound? I like them a
> lot because
> they are good in biaxial and torsion, and good as axial braces.
> -Would a slotted connection with a plate in the middle of a TS be cheaper
> then one plate on each side? I am guessing the two plate
> connection would be
> cheaper so they do not have to slot the TS...
>
> Any other tips or rules of thumbs that you don't think are in the
> AISC info,
> feel free to mention. I think some of the things we have been
> doing may be a
> "standard practice" thing that may be a a bit too conservative
> and result in
> unnecessary costs. Also, sometimes it makes no difference which
> way we do it
> for us, but to the fabricator it makes a huge difference. I would like to
> save the client money and avoid field problems as much as possible without
> design integrity compromise..
>
> Thanks in advance for your valued opinions.
>
> Andrew D. Kester, EI
> Structural Engineer
> Bentley Architects & Engineers
> 665 W. Warren Ave.
> Longwood, FL 32750
> 1-407-331-6116
> andrew(--nospam--at)baeonline.com
> www.baeonline.com
>
>
>
>
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