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Re: Guyed Tower

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EIA/TIA is the prevailing code in the United States. The British codes will
be using British or European standards for tower checking and wind loading,
unless they have incorporated American codes. The North American software is
therefore preferable. Using tension members for the cables can work, but
only if the cable is modeled as a large number of discrete elements. This is
usually not preferred and increases the cost of the analysis due to the more
complicated modeling and checking. MSC Nastran, ANSYS, STARDYNE and other
higher end FEA packages can handle the catenary/cable elements, but are
generally very cumbersome compared to the proprietary tower packages on the
market, which include non-linear, large deformation effects in the standard
analysis procedure.

James Cohen
James Cohen Consulting, P.C.
PO Box 130
Pennington, NJ 08534
Tel: (609) 730-0510
Fax: (609) 730-0511
Website: http://expertpages.com/~jccpc

-----Original Message-----
From: SHAR1210(--nospam--at)aol.com <SHAR1210(--nospam--at)aol.com>
To: seaint(--nospam--at)seaint.org <seaint(--nospam--at)seaint.org>
Date: Wednesday, July 28, 1999 23:45
Subject: Re: Guyed Tower


>Guy wires must be modeled as "Tension" member with pin connections at tower
>end.  However, at the ground end it should be fixed because of
unsymmetrical
>load condition.  StaadPro gives reasonable results.
>A better analysis is obtained using MSC NASTRAN and performing a
"NONLINEAR"
>analysis.
>There is a "TOWER" software produced in ENGLAND which is best for tower
>analysis.
>Beware of wind input which is tricky. "EIA/TIA" code (Tower Design )
requires
>you to check wind in several directions.  Some of these codes are outdated
>and wind forces are based on "Fastest Mile" data which have not been
>collected in last 10 years.  Use ASCE 7-95 to calculate wind force inputs.
>I hope this helps some.
>L.H.K.Sharan, P.E.
>