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RE: New AISC Specs - Backward Compatability of 341-05

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Aha, now I understand.

In general, AISC 341 could be used with older specs without much
difficulty. There are few if any conflicts you'll find with 1999 LRFD or
1989 ASD. But do watch out for sometimes obvious and sometimes subtle
variations with ASCE 7 in its older versions. One major incompatibility
is moment frame requirements. The R factors changed and the systems
changed accordingly between the versions. This is explained in the
Commentary in AISC 341-05.

Charlie



-----Original Message-----
From: Mark D. Anderson PE [mailto:mark(--nospam--at)alaskaengineer.com] 
Sent: Thursday, February 16, 2006 4:37 PM
To: seaint(--nospam--at)seaint.org
Subject: Re: New AISC Specs - Backward Compatability of 341-05

I meant to ask if it is permissible to utilize ANSI/AISC 341-05 spec
with 
either of the pre-unified ASD and LRFD specs, OR whether 341-05 is to be

used ONLY with the new unified spec.

I am working on an implementing project specification and do not want to

mis-match reference documents.  It will take the industry some time to 
"re-tool" with not just code familiarity but also code-checking software
- 
will that have the effect of precluding immediate implementation of 
ANSI/AISC 341-05 on (in this case) private projects?

Mark D. Anderson PE
Anchorage

----- Original Message ----- 
From: "Carter, Charlie" <carter(--nospam--at)aisc.org>
To: <seaint(--nospam--at)seaint.org>
Sent: Thursday, February 16, 2006 12:59 PM
Subject: RE: New AISC Specs - Backward Compatability of 341-05


I'll show some ignorance -- what does backwards compatible mean?

Charlie



-----Original Message-----
From: Mark D. Anderson PE [mailto:mark(--nospam--at)alaskaengineer.com]
Sent: Thursday, February 16, 2006 2:10 PM
To: seaint(--nospam--at)seaint.org
Subject: New AISC Specs - Backward Compatability of 341-05

Does anyone know whether or not the new ANSI/AISC 341-05 spec is
"backward
compatible" with the pre-unified ASD and LRFD specs?

Are any papers or references available that elaborate on the answer to
this
question?

Thank you,

Mark D. Anderson PE
Anchorage


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