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### Records in this category

- Some antenna manufacturers provide flat equivalent area and few of them just provide the dimensions. How can we address the CaAa without ice and with ½” ice for discrete appurtenance without flat equivalent area known?s
- How can we include the CaAa with ½” ice for dipoles and yagi’s?
- For triangular towers: How can we calculate the Df for other wind directions such as 30 and 45 degrees?

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## TIA-222-F

ID #1002

## How can we include the CaAa with ½” ice for dipoles and yagi’s?

Section 2.3.10 of Revision F provides a defined method for computing the effective projected area of
appurtenances including antennas. In addition, Section 2.6.9.2 of Revision G provides a comprehensive approach
for determining the effective projected area of appurtenances. The intent of the Standard is to allow the use of
the Revision G provisions for determining effective projected areas for a Revision F analysis.

**Tags: ** -

**Related entries: **

- How do I use this Site?
- Some antenna manufacturers provide flat equivalent area and few of them just provide the dimensions. How can we address the CaAa without ice and with ½” ice for discrete appurtenance without flat equivalent area known?s
- Section 2.6.9.2Is it acceptable to use the results of Computational Fluid Dynamics (CFD) testing as a substitute to the requirements outlined in section 2.6.9.2? If so, what conditions must be meet? If so, can we claim the tower is compliant with TIA-222-G if the wind tunnel data is used?
- Section 2.6.9.2Can I use loading that is less than the values prescribed by the written TIA-222-G and claim compliance with the standard? If so, under what conditions?
- Section 2.6.9.2Is it acceptable to use the results of wind tunnel testing as an acceptable substitute to the requirements outlined in section 2.6.9.2? If so, what conditions must be meet? If so, can we claim the tower is compliant with TIA-222-G if the wind tunnel data is used?
- Section 15.4 question regarding existing tower re-analysis; submitted 12/31/2007
- 2.6.7.4 Gust Effect Factor for Structures Mounted on Other Structures
- As everyone is aware, many jurisdictions are now adopting the IBC 2012, which has updated wind speed maps. Regarding TIA-222-G, can the converted (Vasd) wind speeds from the IBC 2012 be used instead of the wind speeds listed in TIA-222-G, or do we need to take the more stringent of the two? I know this gets a little tricky when the risk category/structure class is something other than II, since the importance factors in TIA are more elaborate (wind speed with no ice, with ice, ice weight) than those in the IBC (who simply provide a number for the wind speed with no ice). We do a lot of work on the Atlantic coastline, and these changes would be most beneficial to our clients. Any interpretation of this would be greatly appreciated.
- Section 2.7.3 states “Further, …earthquake effects may be ignored when the total seismic shear is less than 50% of the total horizontal wind load without ice.” Does ignoring earthquake effects include the seismic considerations of Section 9.6, since the tower structure itself would be capable of satisfying that requirement?
- If Ca=1.5 is used for a rectangular cluster of round lines, can that be considered a "sub-critical" coefficient, so that Ka can be equal to 1-epsilon, with the 0.6 cap, provided the lines are all in the face zone? The term “sub-critical” only applies to round objects, not square or rectangular, and Ca=1.5 does not seem to be sub-critical coefficient nor a “flat” coefficient. But the edges of the cluster are round, after all.

Author: John Erichsen

Revision: 1.0

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