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VK5QX > SATS 06.02.03 13:04l 76 Lines 2806 Bytes #999 (0) @ WW
BID : 160551VK5QX
Read: DB0FHN GUEST
Subj: Re ZR4LP and Satellites
Path: DB0FHN<DB0RGB<OK0PPL<OK0NAG<9A0BBS<VK6BBS<VK3AVE<VK5BRC<VK5SPG<VK5LZ
Sent: 030205/1236Z @:VK5LZ.#ADL.#SA.AUS.OC #:57090 [Elizabeth] $:160551VK5QX
From: VK5QX@VK5LZ.#ADL.#SA.AUS.OC
To : SATS@WW
AN ENGINEERING PROBLEM.
Dick VK3ABK makes the following comment as regarding a request from Johnan
ZR4LP in connection with tower foundations.
__________
" On Johan's tower query, this is an engineering problem which his local
city council would be able to solve. It depends on local laws, and soil
and wind factors.
We in Australia have a help line in our national Ham organization, The
Wireless Institute of Australia. Local laws vary from one city, or state,
to another. "
__________
I disagree to some extent with Dick as regards the suggestion that " this
is an engineering problem which his local city council would be able to
solve."
Primarily, the matter of foundations and other structural engineering
issues can only be properly resolved by having a suitably qualified
(structural) engineer make the necessary calculations.
The local councils MIGHT be able to assist as far as providing references
as to where details of mandatory standards can be found. However, the
engineer, as referred to above, would surely already be aware of such
matters.
In my experience local councils, at least here in Australia, usually do
not seem to have any high levels of experience in matters such as these.
In fact, it seems to be the case, more often than not, for councils to
call for private qualified consultants where needed.
It may be that, in VK3, the WIA has access to some expertise, however, I
rather doubt that this is generally the case as far as other WIA Divisions
are concerned.
It would be interesting to hear from some responsible sources, within each
State Division, as to just what expertise is available.
(I am always suspicious of the various "instant experts" who seem to
appear where such matters come under discussion.)
I would suggest that, where necessary, people seek to obtain advice from
those actually involved in construction work. I would imagine that in most
places there would be some sort of body, such as a Building Advisory
Council, who could point a person in the right direction.
Expert advice is certainly important. It would certainly not be very nice
to encounter a subsequent situation where a large tower, or any other
structure for that matter, collapsed with resultant damage, or even death,
due to someone not having been properly aware of what the real
requirements should have been.
In a previous bulletin I provided some idea, on a practical basis, of what
can be done where detail has been provided as to what is necessary in a
particular case.
My suggestions in that bulletin were based on a more than conservative
approach of making tower foundations even better than required by the
experts.
Regards,
Ian
__________
73 de Ian, VK5QX
@ VK5LZ.#ADL.#SA.AUS.OC
05 February 2003
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