RicodJour wrote:
wrote:
The Real Bev wrote:

wrote:

A 20' P5501 rod could hold 330 pounds with a 3.82" deflection.

And a 20' P5001 rod could hold 1130 pounds with a 1.24" deflection.

Are you sure about that?

Oh yes. The beam loading table on page 54 of the Unistrut General Engineering
Catalog (North American Edition, No. 14, 2002) lists 1.24". Furthermore,
deflection d = 5WL^3/(384EI), and the elements of section P5001 table lists
the 1-1 axis moment of inertia I = 5.578 in^4. E = 30x10^6 psi makes
d = 5x1130lbx240^3in^3/(384x30x10^6lb/in^2x5.578in^4) = 1.22".

Page 17 of the 2001 Cooper B-Line catalog lists a max 1593 pound uniform load
and 1.563" deflection for their equivalent B11A shape, which corresponds to
a 1130/1593x1.563 = 1.11" deflection with a 1130 pound load, with a note:

Based on simple beam condition using an allowable design stress of
25,000 psi (172 MPa) in accordance with MFMA, with adequate lateral
bracing (see page 11 for further explanation.) Actual yield point of
cold rolled steel is 42,000 psi.

So I guess that you'd bend up your own hangers with that strut since
any typical hanger wouldn't come close to fitting.

Typical hangers fit fine on the P5500 shape. Others may require hangar
modification. Then again, few people own that many clothes :-)

Nick