TIA codes Rev G or F? IBC 2000 ASCE 7-98 Questions

[adurbin]

Our company does a lot of cell site work for Nextel, Sprint, Voicestream, AT&T etc. (wherever we can get it nowadays) and in the process we have to state what the wind loads are for the site location. Currently we have been using TIA/EIA rev. F (march 1996). Take for example Kitty Hawk, NC, Rev. F says Dare County 110 mph. However the county uses IBC 2000 which references ASCE 7-98 with a wind speed of 130 mph. When submitting the drawings to the county for review the analysis was done using the current (TIA/EIA rev. F since Rev. G is not out yet) and a 110 mph. The problem occurs when County Joe inspector sees that and says we want it designed for 130 (IBC 2000) not 110. What do you say? I've tried to give him an answer that involves explaining ASCE 7-98 and that Rev. G is not out yet. Any help appreciated. Thanks

 

[VoyageofDiscovery]

Hi adurbin,

The TIA/EIA standard states that it is not intended to replace or supersede applicable codes.

Thus you have to conform to IBC 2000 (ASCE 7-98).
I am not familiar with the ASCE 7-98 yet.

From my memory the wind speeds in ASCE 7-95 are based on 3-sec gust wind speeds. This will require you to convert the 3 sec speed to a TIA/EIA-F wind speed. The fastest mile conversion in the ASCE-95 is not this conversion as the TIA/EIA-F has completely different wind parameters.

Regards

VOD

 

[adurbin]

VOD,

In ASCE 7-98 Basic Wind Speed , V: 3-Second gust at 33 ft above the ground in Exposure C. I believe for Previous editions it was the fastest mile wind speed associated with an annual probability of 0.02 measured at a point 33 feet above ground for an area having exposure C.

Anyway I did find out that the wind speed in IBC 2000 governs, however it must be converted to the fastest mile wind speed for the purposes of an analysis using TIA/EIA rev. F