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RE: "Special" K-Joist vs. KCS Joist

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The answer to this question really depends on which manufacturer you are
dealing with.  Over the past 5 years or so, most manufactures will tell you
that they are so busy that it is more economical to specify a KCS series
joist even though it would typically be more material weight than a joist
designed and fabricated for a "special" loading condition.  This is because
there is both time and money (both in-house engineering and fabrication)
involved with a "special" joist as opposed to a KCS joist.

Matthew Stuart, PE, SE, PEng
Atlantic Engineering Services

-----Original Message-----
From: EMAIL SERVER
Sent: Friday, September 01, 2000 5:02 PM
To: MATTHEW STUART
Subject: FW: "Special" K-Joist vs. KCS Joist




-----Original Message-----
From: Bill Polhemus [mailto:bpolhem(--nospam--at)swbell.net]
Sent: Friday, September 01, 2000 1:18 PM
To: seaint(--nospam--at)seaint.org; structx(--nospam--at)polhemus.cc
Subject: "Special" K-Joist vs. KCS Joist


Hey, all you out there in StructuraLand(tm).

Here's a topic for discussion.

If you're handling such things as large concentrated loads (e.g. Rooftop
equipment like RTUs, etc)., which is less expensive: Calling for a "Special"
joist by giving the contractor a load diagram, or selecting a "constant
shear"
KCS joist?

The Vulcraft catalog that I have hedges on the issue of cost-effectiveness.
I'm
wondering if a KCS joist might be a better idea even IF you know where the
load
is going to be. And if you're NOT sure--or if the contractor is in the habit
of
putting the equipment at a location other than what is anticipated--it seems
that KCS would be hands-down choice.

I'd like to hear other opinions.

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