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Re: ANSI/TIA-222-G-2005

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Both ASCE 7 -02 and 7-05 have 1.6W in the basic load combination using strength design.  The 1.3W used to be in the older alternative basic load combination (ASD) in the 2003 and older IBC.

G. Bunkers wrote:
The lastest version of the code for towers - TIA-222-G-2005 has went to
Limit State design and shows the following load combinations:
 
1. 1.2D + 1.0 Dg + 1.6 Wo
2. 0.9 D + 1.0 Dg + 1.6 Wo
3. 1.2 D + 1.0 Dg + 1.0 Di + 1.0 Wi + 1.0 Ti
4. 1.2 D + 1.0 Dg + 1.0 E
5. 0.9 D + 1.0 Dg + 1.0 E
 
My question is why the 1.6 factor for wind.  ANSI / ASCE
states  1.3 .
 
Gary Bunkers P.E.