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Re: Components & Cladding for Wood Roof Trusses

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The typical truss designer does not design C&C.
The typical EOR doesn't specify or have knowledge of it.
The typical building department plancheck doesn't require and check for it.
Typically, the job is built and finaled without the correct design.
That 'Factor of Safety' really comes into play here...

Most truss software will do it, automatically.
All truss software will do it manually.

EOR's should specify C&C design, System reactions (& uplifts),
and min/max member forces for use in system bracing design.

Charlie Truax



----- Original Message ----- 
From: "Kestner, James W." <jkestner(--nospam--at)somervilleinc.com>
To: "SEAINT" <seaint(--nospam--at)seaint.org>
Sent: Wednesday, April 14, 2004 7:33 AM
Subject: Components & Cladding for Wood Roof Trusses


ASCE 7-98 requires that wood roof trusses be designed for C&C loading with Zones
1, 2 and 3 and overhangs. It seems impractical for the EOR to list all the loads
for the truss designers because of the various effective areas for different
trusses. About the best that we can do is to reference that the truss designer
needs to comply with the C&C requirements of ASCE 7-98. Additionally, our
drawings must list: Basic Wind Speed, Importance Factor, Exposure Factor and
Internal Pressure Coefficient and minimum dead load (to determine net uplift).

Does anyone else specify C&C loads differently?

Does the typical truss designer know how to handle this loading or is it done
automatically for him? Does the typical truss program take these C&C loads into
account?

Jim K.




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