[TowerTalk] Tower Questions

[Kurt Andress]

Hank, 
Thanks for posting this. It is the best description I've seen for the
relationship between the spec's. I hope some of todays comments on this
thread suggest that the tower spec's might be converging. Might make
life a bit easier for some of the folks around here. Hmm.... wouldn't it
be fun to see that happen for those gizmos, at the other end of the
dreaded attenuator (?), that we want to hang on these towers.

73, Kurt, K7NV 


"Lonberg, Hank" wrote:
> 
> 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.
>

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