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Re: [TowerTalk] Guying a self-supporter

To: Steve Maki <>
Subject: Re: [TowerTalk] Guying a self-supporter
From: jimlux <>
Date: Sun, 09 Nov 2008 15:03:58 -0800
List-post: <">>
Steve Maki wrote:

> I wish I could justify the purchase of one of the finite element 
> analysis programs, but I know they're not cheap...

There are lots of free FEM programs out there.(FeLT and GRAPE spring to 
mind)  The real challenge is in having the expertise to effectively use 
them. Also, free usually implies non-user-friendly interface (for casual 
users).. just like for NEC.

And, just like for NEC, the devil is in the details.  Are you going to 
model the details of the bolted joints or use some reasonable 
approximation? Are you going to model the L section as a simple beam 
with specified parameters, or actually the details of the L.

It's much worse with structural FEM than for ElectroMagnetic.. In EM 
modeling, it's a conductor with specified properties, and generally 
isotropic, and there's no concept of "bending".  In structural, a beam 
has torsional, bending and shear, and they're different in all 
directions and coupled to boot.

There's a reason that introductory texts talk about idealized beams with 
uniform cross section in axial compression, tension, or simple bending 
or torsion only.


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