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RE: Cranes: Curved Track Monorail

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    The way I look at it is:  If the web and both flanges of the monorail
beam are connected by a stiffener plate the connection is fixed for torsion.
This is usually only possible at the ends not at intermediate supports.  The
key thing is getting the flanges and web to act together with out distortion
of the section.   If only the top flange of the monorail beam is connected
to the support, distortion of the section is possible.  The connection is
pinned for torsion at that location.  These end conditions are used to find
the warping stresses along the monorail beam.  The supporting bolting
pattern must be able to take the end torsion regardless of the condition
used.

Acie Chance

-----Original Message-----
From: David Maynard [mailto:davemaynard(--nospam--at)ceincorp.com]
Sent: Wednesday, January 05, 2005 10:45 AM
To: seaint(--nospam--at)seaint.org
Subject: RE: Cranes: Curved Track Monorail


Again, to revisit this issue, I was looking at the torsional analysis needed
for this monorail, and the end conditions got me slightly perplexed.  Let me
refresh your memory on the situation.  The hoist is an underhung monorail
hoist with a support structure located above the monorail.  The monorail
(likely S section) will be hung using bolts through the top flange of the
monorail to the bottom flange of the support structure (likely WF sections).

Torsion of the monorail is an obvious consideration, especially with a hoist
capacity of 10 Tons.  Now, with the above hanging connection as described,
what would be the description of the "Physical Condition" and the "Torsional
End Condition" for analysis???

Thanks for the information.  I really appreciate it.

Dave Maynard, PE
Gillette, Wyoming
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