To: "'seaint(--nospam--at)seaint.org'" <seaint(--nospam--at)seaint.org>
Subject: Re: Transmission Line Tower Foundations
From: ARW <arw(--nospam--at)lhr.paknet.com.pk>
Date: Mon, 28 Feb 2000 05:29:16 +-500
Encoding: 40 TEXT
In reply to clarification sought by Peter McComack, who wrote:
"Before I jump in with any suggestions, what type/types of towers
are you dealing with? is it a single circuit structure, a dead end,
deviation etc. . . . . "
Dear Peter McComack:
I am extremely grateful for your prompt reply.
My line is 132 KV Double Circuit Overhead Transmission Line. The towers
include: suspension, 10 deg, 30 deg, 60 deg and terminal. I am making
bid-stage foundation designs.
The tower reactions have been provided by the tower manufacturer. The data
says that the reactions are "ultimate" reactions using the same overload
factors, as have been used in the tower design. I requested the breakup of
loads and the values of the overload factors, but the manufacturer has
shown its inability to provide any breakup. All I have been given, for each
tower type, are: Compression, Uplift, Transverse Shear and Longitudinal
Shear. I also requested separate reactions for each pair of foundations,
for the case of angle towers, but even that information does not seem to be
But I think we can safely assume that broken wire condition must have been
considered, but how many wires, I can not say.
The employer has provided a design criterion which is rather ambiguous.