When to start using new AISC manual
When to start using new AISC manual
(OP)
There has been some discussion in our office over when to start using the new AISC manual. There are two schools of thought. The first is that we should start using the new manual NOW. That is we should specify steel sizes and follow the specification in the "latest" edition availiable. The second thought is that the "correct" edition of the manual is the one specified in the building code that we are designing to. It may be acceptable to use the new manual for "sizes" but that the steel specification to follow is the one called out in the aplicable building code. Anyone else have these "conversatitions", and how did you resolve them.





RE: When to start using new AISC manual
RE: When to start using new AISC manual
RE: When to start using new AISC manual
RE: When to start using new AISC manual
"That depends on your contract documents. If the 2005 AISC Specification is cited in your contract documents, then one should use the 13th edition AISC Manual.
If you are not bound to contract documents (the owner is your company, not an outside entity), then it is your choice of when to upgrade. AISC always recommends the use of the latest available design information.
You may find that the latest requirements will lead to more economical designs in some cases."
RE: When to start using new AISC manual
RE: When to start using new AISC manual
RE: When to start using new AISC manual
RE: When to start using new AISC manual
www.SlideRuleEra.net
RE: When to start using new AISC manual
That being said, if you design by ASD (9th) for one beam per job, it's probably not going to cause you any problems.
RE: When to start using new AISC manual
The case of economy varies depending on the ration of Dead load to Live load. LRFD being more economical for low live load conditions than the ASD and visa-versa for high live load conditions.
The "choice" as to when to use the new specification is not really up to the engineer, but rather, depends on the location of the project and what particular code governs the design. Each bulding code will reference a particular AISC specification and this will be the deciding factor as to which to use.
RE: When to start using new AISC manual
RE: When to start using new AISC manual
RE: When to start using new AISC manual
RE: When to start using new AISC manual
RE: When to start using new AISC manual
Strength-based design under ASD could involve some serious beefing up for serviceability as well.
Hg
Eng-Tips policies: FAQ731-376
RE: When to start using new AISC manual
RE: When to start using new AISC manual
RE: When to start using new AISC manual
RE: When to start using new AISC manual
What I tried to resolve is how to use one of their three methods via a Pdelta analysis on one of our programs without the extra work of calculating those B factors or messing with the EA and EI of the members since the program also checks/designs the members and if I change their properties the analysis may be right but the design won't be.
For some structures, there are perhaps over 20 load combinations to check, and with N number of members, two directions of moment (x, y), and two B factors (B1 and B2) that would require 40 x N x 2 x 2 different B factors (160 x N).
Sometimes I don't think that the academians who write these specs realize what they are doing to the practicing engineer.
RE: When to start using new AISC manual