Allowable Design Loading & Foundation Plans - TIA Revision G


Updated March 15, 2010

AN Wireless Tower Company, LLC has modified our Allowable Design Loading tables and Foundation Plans to adhere to Approved National Standard ANSI/TIA-222-G. This Standard, sometimes referred to simply as 'Revision G' has replaced ANSI/TIA/EIA-222-F.

Revision G requires more site-specific parameters be given consideration prior to both specification and construction of tower and foundation, as compared to Revision F. Some of these parameters which now require attention include Exposure Category, Structure Classification and Topographic Category. The minimum design windspeed has gone from 70-mph fastest-mile under Revision F, to 90-mph 3-second gust under Revision G. With new wind force equations in Revision G, the change in wind speeds alone does not produce a significant change to the wind forces on towers. The introduction of the parameters listed above is proving to have a more substantial impact. In addition, the Soil Type now carries a more finite definition as compared to the 'Normal Soil' specification which was phased out with Revision F.

It is ultimately up to the purchaser to properly specify a tower for a given site. Care must be taken in order to fully understand the information contained in our Allowable Design Loading tables, which are displayed as PDF files accessed through the links below.

The 'Sheet Title' block found in the lower right hand corner of each Allowable Design Loading table includes Category, Classification and Soil Type description information for that table.

The 'Notes' section found in the center of each Allowable Design Loading table provides thorough explanations on each Category and Classification for that table.

Details regarding 'TIA 222-G - Annex F - Presumptive Soil Parameters' are found in the PDF link below under this title.

With Revision G, and because of an increased number of foundation sizes, our foundation plan lettering system (A, B, C, D, E) has been reversed in order alphabetically from our previous lettering system. Now, 'Type A' is our smallest available foundation size, and 'Type G' is our current largest foundation size. Our new Revision G Allowable Design Loading tables provided below will correctly match up with this new foundation type lettering system.

Our previous Allowable Design Loading table created under ANSI/TIA/EIA-222-F-1996 - as well as foundation drawings found previously on this website or elsewhere shall no longer be used.

In all cases the services of a Geotechnical Engineer (Geotech) are recommended in order to properly identify the soil type on site prior to tower specification and foundation excavation. We can provide custom foundation plans based on weak soils for a fee, based on a customer supplied Geotechnical Report.
 

HD / LD Towers - Allowable Design Loading Tables

 HD-LD Allowable Design Loading - Exposure Category B - Soil Type Clay

 HD-LD Allowable Design Loading - Exposure Category B - Soil Type Sand

 HD-LD Allowable Design Loading - Exposure Category C - Soil Type Clay

 HD-LD Allowable Design Loading - Exposure Category C - Soil Type Sand


HHD Towers - Allowable Design Loading Tables

 HHD Allowable Design Loading - Exposure Category B - Soil Type Clay

 HHD Allowable Design Loading - Exposure Category B - Soil Type Sand

 HHD Allowable Design Loading - Exposure Category C - Soil Type Clay

 HHD Allowable Design Loading - Exposure Category C - Soil Type Sand


Foundation Drawings - Type A thru G

 Foundation Type A  --  Solid Block

 Foundation Type B  --  Pad & Pier / Solid Block

 Foundation Type C  --  Pad & Pier / Solid Block

 Foundation Type D  --  Pad & Pier / Solid Block

 Foundation Type E  --  Pad & Pier / Solid Block

 Foundation Type F  --  Pad & Pier / Solid Block

 Foundation Type G  --  Pad & Pier / Solid Block


TIA 222-G - Annex F - Presumptive Soil Parameters

 TIA 222-G_Annex F_Presumptive Soil Parameters


Design Comparison - AN Wireless Tower and the Trylon Titan Tower - Performed by TEP, Inc.

 HTML Version of Design Comparison Report



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