I may be wrong, but almost all strut products seem to be interchangeable.
That is 3/4" x15/8" , 15/8" x 15/8", 27/16" x 15/8" 31/4" x 15/8",
etc.(12ga.) and all of the same gauge material. It would seem to me that to
simplify this problem, use the Power Strut chart Tim linked with the modulus
per size specified, and if your material is the same in Dim. and gauge, use
that mod. if its heavier ga. still use the lighter ga. mod. If its the same
ga., but different Dim. use a smaller Dim. and mod.
This is published to meet NFPA 13, 1996, but the Modulus doesn't change.
Your more likely to change the spacing, or exocentric load the hanger, than
to use the 15' the chart establishes. Also remember that the spacing is for
15' of load, but the lower line is for lightwall, some sizes of which cannot
be supported at 15' spacing (12'-0" max)
Interesting that this should come up today, I have a meeting on Wed. to
discuss strut hangers on racks of fire sprinkler mains, 4 - 4" LW mains
supported by 4'-0" long double 15/8" struts, 12' to 15' O.C. (Installed by
others, but not accepted by the AHJ.)
Thom McMahon
Firetech, Inc.
2560 Copper Ridge Dr
Steamboat Springs, CO 80488-2136
Tel: 970-879-7952
Fax: 970-879-7926
----- Original Message -----
From: "G. Tim Stone" <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Monday, July 23, 2007 6:59 AM
Subject: RE: Section moduli of Unistrut
Travis,
Check out the following link to Power Strut:
http://www.powerstrut.com/psjan2005/fibergl182.jpg
G. Tim Stone
NICET Level III Engineering Technician
Fire Protection Sprinkler Design
and Consulting Services
117 Old Stage Rd. - Essex Jct., VT. 05452
TEL: (802) 434-2968 Fax: (802) 434-4343
[EMAIL PROTECTED]
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:sprinklerforum-
[EMAIL PROTECTED] On Behalf Of Travis Mack
Sent: Monday, July 23, 2007 8:29 AM
To: [email protected]
Subject: Section moduli of Unistrut
Does anyone have a datasheet or link to download one for Unistrut (or
something similar) that gives the section modulus. We need to size some
unistrut for trapeze hangers. I remember a table in the unistrut
catalogues
from many years ago, but can't find it any more.
Thanks for your help.
Travis
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