Light gage design 6

[dgkhan]

Normally light gage steel catalogue has all the design loads like steel joists. Can we verfiy those number by AISC manula 13th edition or there is separate design guide for this

 

[JAE]

Light gage design is governed by the American Iron and Steel Institute (AISI) found here:

http://www.steel.org//AM/Template.cfm?Section=Home

 

[dgkhan]

If we know the grade of light gage steel, Section properties (from manufacturer's catalogue)using slenderness
criteria for deisgn in AISC 13th edition, we can design light gage too.

 

[lkjh345]

Is that a statement or a question?

Agree with JAE, AISI has a totally different design guide that should be used for the design of light gage steel members. AISC Manual should not be used.

Design of light gage members, from scratch, can be quite a difficult thing if you are not familiar with the AISI guide and its methodoligy (?). The Steel Stud Manufacturers Association (SSMA) publishes a Product Technical Guide which can be downloaded from their website. This guide is quite useful when designing in light gage steel members.

 

[DaveAtkins]

I suppose if something like column buckling controls the design of a member, then you could use the AISC for light gauge steel design--after all, steel IS steel. However, quite often with light gauge members, local buckling causes a reduction in the effective section properties, so you usually can't use the AISC equations.

DaveAtkins

 

[whyun]

If you have the 1994 UBC, a free copy of 1986 AISI cold-formed steel specs can be found in Division V of Chapter 22.

 

[Galambos]

make it REALLY easy on yourself and go to

http://www.steelnetwork.com

and download the SteelSmart System v5.0 under the software tab.

AISC does not apply to lightgage, no matter how you twist it.

 

[dgkhan]

“But why? This is my question”.
We cannot apply AISC design on Reinforced concrete that I follow.
AISC also checks compact, non-compact and slender section and assigns strength accordingly.
Obviously in Light gage ( all sections slender) , local buckling due to thin sections will be controlling most of the time. Now AISC has equations for various slender ratios and corresponding reduction in capacities.
What is here which AISC is missing? Which makes it unusable for light gage? That’s all I want to know please?

 

[nutte]

The AISI specification utilizes post buckling strength of light gage sections. AISC does not. If it has buckled, it's done. AISI calculates the additional strength the buckled section possesses and uses it.

 

[Galambos]

You cannot use it per the scope spec section A1 which refers to section 2.1 and 2.2 of the AISC Code of Standard Practice. This section defines structural steel.

 

[civilperson]

AISC Specification limits their applicability to Structural Steel, "... For the design of cold-formed steel structural members, whose profiles contain rounded corners and slender flat elements, the provisions of the American Iron and Steel Institute ... are recommended.

 

[lkjh345]

Good answer Galambos. That pretty definatively answers the question.

 

[Bobber1]

Among other things, light gage steel has much more shear lag than heavy gage.

 

[csd72]

Light gage steel has completely different buckling modes to standard heavy gage steel, the design of the two is incomparable.