Need a book? Engineering books recommendations...

Return to index: [Subject] [Thread] [Date] [Author]

Re: ANSI/TIA-222-G-2005

[Subject Prev][Subject Next][Thread Prev][Thread Next]

One of the big differences is the "Directionality Factor".  See ASCE 7-05 Section 6.5.3 (1) for the start of the procedure.  The higher wind load factor is partially compensated by the addition of the Directionality Factor.

Ed Haninger

Drew Morris <dmorris(--nospam--at)>
06/27/2006 10:52 AM
Please respond to seaint
Re: ANSI/TIA-222-G-2005

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.

The information transmitted is intended only for the person
or entity to which it is addressed and may contain proprietary,
business-confidential and/or privileged material.
If you are not the intended recipient of this message you
are hereby notified that any use, review, retransmission,
dissemination, distribution, reproduction or any action taken
in reliance upon this message is prohibited. If you received
this in error, please contact the sender and delete the
material from any computer. Any views expressed in this message
are those of the individual sender and may not necessarily reflect
the views of the company.