Metal Bldg Design using RISA 3D

[OUe]

Has anyone used RISA 3D for the analysis of a metal building? I am having trouble figuring out if the AISC 13th edition is ok to use? Where does the AISC address web tapered members for axial load + flexure?

The last I used RISA 3D for a metal building analysis was with spreadsheets that took only the analysis portion of RISA 3d and incorporated the appendix F of the 9th edition.

Any comments welcome. Thanks.

 

[ishvaaag]

Quite likely the current intent of AISC respect web tapered members is them to be designed as per Design Guide 25, Frame Design Using Web-Tapered Members.
Then specific omission in the current code would be to direct to the guide.

As for RISA-3D, one should look in the documentation if your version includes the design as per such guide (normally such thing wouldn't be omitted, since an achievement). Last version I have for the guide dates from 2011, what makes unlikely the implementation, but ask Risatech.

Anyway, I loving simple things wherever possible, find daunting a 200+ pages guide for tapered members for office use. Even tabulated solutions would be better, even if in order to keep economy tight.

 

[WillisV]

ishvaag is correct in that DG 25 is the current AISC method for the design of web tapered members. He is also correct in that it is quite lengthy, but more because it is comprehensive than unduly complicated.

 

[JoshPlumSE]

As of today (May 2012) RISA does not yet perform code checks per the AISC DG-25. We've had a decent number of requests for it though. Therefore, we are trying to get it into the next release of the probram (version 11 due out at the end of 2012 or beginning of 2013).

Honestly, I was excited enough about this new procedure that i would have liked to see us add it in a couple of years ago (based on a draft copy of the DG-25). This new tapered member design methodology just seems so much more rationale and comprehensive that was was in LRFD 2nd and AISC 9th. But, our company felt that releasing a major feature based on an unpublished document might not be a good idea.

 

[WillisV]

our company felt that releasing a major feature based on an unpublished document might not be a good idea

good call...