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Re: Satellite Dish

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There is, structurally, no reason not to use steel beams. However, be aware
of stringent deflection criteria and fatigue issues. The dish manufacturer
should be able to give you the forces for any wind direction which would be
used to find the most critical load combinations. Maximum moment, uplift,
shear and deflection may not all be coincident. I suggest analyzing the dish
and supports for a minimum of 22.5 deg intervals, preferably 10 deg. The
chart of wind loads vs. direction will give you an idea of how detailed the
analysis should be. If the dish is at roof level, be aware of possible wind
speed-up effects, which can be considerable. Whatever system is used, it is
also likely that strengthening of, at least, the first level of columns will
be required.

James Cohen
James Cohen Consulting, P.C.
PO Box 130
Pennington, NJ 08534
Tel: (609) 730-0510
Fax: (609) 730-0511

----- Original Message -----
From: "Alexander Gutierrez" <alexgutz(--nospam--at)>
To: <seaint(--nospam--at)>
Sent: Sunday, March 19, 2000 2:13
Subject: Satellite Dish

> Our company is planning to put an IT building, and they want to install
> a satellite dish on top of the building...