[TowerTalk] Tower Questions

[Lonberg, Hank]

Actually in most cases the local building officials want the design to
comply with the locally adopted building code, like the UBC, SBC, or BOCA
building codes. It just happens that EIA/TIA 222-F is, in the case of the
UBC, included by citation. This however does not typically satisfy the local
building officials who want to see the calculations documentation done via a
mechanism they are familiar with.

The EIA/TIA is actually a standard of practice for an industry to define the
minimum level of design and methods of design for the manufacture of the
towers for environmental loads. Actually the EIA/TIA uses the ASCE-7
standard for minimum loads for structural design. This ASCE-7 standard also
happens to be the basis for much of the wind loading requirements of the
above mentioned national building codes.

The tower ,in and of itself, doesn't have to meet the EIA/TIA necessarily
but will have to comply with locally adopted building code. We are talking
about Standards of Design and Analysis for manufacturing a component for
environmental loads, i.e., the tower and Building Codes that are adopted and
mandated by statue or law. This is a very big difference and also is binding
on the individual who will retain ownership of the structure.

I run into this same distinction every time I design an installation for a
client. In the end if the installation needs a building permit then the
documentation, submittals and design will have to comply with the building
code that is locally enforced. It has not been a common occurrence, in my
experience, to have the local building officials agree to accept a building
code or standard of manufacture they are not familiar with. What  you have
are two different standards or codes, one for the assurance of the design of
the manufactured component, the tower, and the other for the assurance of
life safety of the general public with respect to the actual installation,
the local building code.


Hank / KR7X  P.E.



	-----Original Message-----
	From:	Chanel1096@aol.com [SMTP:Chanel1096@aol.com]
	Sent:	Wednesday, April 12, 2000 12:01 PM
	To:	towertalk@contesting.com
	Subject:	Re: [TowerTalk] Tower Questions


	In a message dated 4/12/00 3:40:29 PM Eastern Daylight Time, 
	Tower2sell@aol.com writes:

	> The ANSI/TIA/EIA-222-F, 1996 (the current code) does not have
Exposure 
	> Factors. They have been eliminated and the equlivent of Exposure C
used. 
	> Therefore You can no longer design for Exposure B - suburban
terrian. Now 
	> keep in mind that some local juridictions do not use the EIA-222
like some 
	> counties in Florida. 

	Keep in mind however that if the state has adopted a building code
that uses 
	TIA/EIA-222, that it becomes the minimum standard, so even if the
local 
	county has it own code that requires something different, the tower
must also 
	meet the TIA/EIA code.

	-Bill

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