What really goes on in a guyed tower is pretty complex. A simple static
analysis might be possible with a spreadsheet, but not a realistic
analysis IMO.
Kurt K7NV a long time ago did a Finite Element Analysis of a simplified
tower structure using the standard Rohn section properties. His model
is not a detailed model of the actual lattice construction, hence
failure modes are coarse approximations. His website has that analysis
last time I looked and it is quite instructive as to how a guyed tower
behaves. k7nv.com
Recall tower axiom #1: Follow the tower manufacturer's design unless a
PE provides an analysis. If what is wanted is different than the
catalog designs, then it is time to hire a PE. Many configurations are
possible that are not in the catalogs.
Unfortunately, two PE's I have used are refusing amateur radio tower
analysis jobs because too many hams don't implement to the plan, or
don't want to pay the fee, or want to argue with the numbers. The
hassle, cost of the required software, and liability risk aren't worth it.
Grant KZ1W
On 10/13/2019 7:51 AM, Tom Hellem wrote:
Does anybody know of a tool for calculating the forces associated with
sizing guy wires on a tower? It feels to me that this would lend itself
rather easily to a spreadsheet where one could enter the variables of his
installation and the spreadsheet would spit out the results.
I found a few rudimentary calculators on line but they don't seem to quite
take it all the way.
Any engineers out there willing to share something like this? I think it
would be very useful to anybody who has or is contemplating the
construction of a guyed tower. I personally know of a few installations
that look like a catastrophe waiting to happen and not being an engineer or
tower erector I am having a tough time convincing the owners of these
installations that they should make some improvements.
73
Tom Hellem
K0SN
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|