From: Davis Parsons <davisp2(--nospam--at)flash.net>
Date: Thu, 18 Jan 2001 10:19:12 -0600
Jeff Williams wrote:
> Davis, the trusses are open web steel trusses/joists with double angle top
> and bottom chords. The webs members are either angles or rods. We were
> not able to visual see any of the trusses during our visit to the site due
> to existing "hard" ceilings. This information was taken from the existing
> architectural and structural drawings.
On older buildings, it is imperative that you be able to see the joists that
are in place so that the manufacturer can be established. Previously I descibed
CECO joists. Armco joists had top and bottom chords that looked like a large
hat-sections, with round webs. Bethlehem joists had double-angle top and bottom
chords with round webs. Kalman (Bethlehem) joists look like expanded metal lath
> Any info. that you can provide would be great.
> What company is "CECO" ?
CECO Steel Products Corporation. I believe they stopped manufacturing joists
in the early 70's along with Armco and Bethlehem.
> -----Original Message-----
> From: Davis Parsons [SMTP:davisp2(--nospam--at)flash.net]
> Sent: Wednesday, January 17, 2001 11:58 AM
> To: seaint(--nospam--at)seaint.org
> Subject: Re: 1951 Steel Roof Trusses
> If your trusses are open web steel joists, then I have an old CECO joist
> which has load tables for a 248 and 166 joist designation. CECO short span
> joists had double angle top chords with rod bottom chords. CECO long span
> joists had topand bottom chords
> that looked like Cees turned sideways.
> Can you provide a description of these trusses?
> Jeff Williams wrote:
> > Hello everyone,
> > This may have been asked before, but I have the following dilemma. We
> > modernizing several buildings of a 1951 school in the San Francisco area
> > and the roof members are constructed with steel trusses. I have
> > several manufactures about the truss properties, but I'm have no luck.
> > Therefore, if someone can direct me to a piece of literature or if
> > might have the properties associated with the followings truss
> > designations, it would be greatly appreciated.
> > The truss designations on the drawings are as follows:
> > #248
> > #116-216
> > #166-219
> > #165-235
> > Jeff Williams, S.E.
> > PARADIGM Structural Engineers