Hello,
I am trying to understand how RAM check interaction in steel elements using AISC.
The code clearly requires to check equations H1-1a or H1-1b. I realized that although RAM do this calculation, it is displayed as intermediate results. The problem is that this should be a design limit.
If I design (not optimize) the elements, the software shows me that the column design is OK, and the stress ratio is 81%.
But if I go to the report, I can see the combined flexure and axial as the 81% for H1-3b equation but the interaction is actually 1.03, so this should not be ok.
How does RAM considers this? If I understood it correctly, this is misleading and might lead to big mistakes.
Thank you,
Murilo Santos
Can you confirm the code year, the cross section, and the program version please.
Seth,
Thanks for the quick reply.
AISC 360-2016 (I'm using LRFD).
This column is W27x161.
I don't know how to verify the program version. I tried looking, but didn't find. Would appreciate some help.
Thanks,
Murilo
You can get the version rom file - help - about.
I ran a test using that size and combined axial compression and major axis bending, but I'm not getting the same results. There must be a special set of forces that causes your output, so if you can send me your file, or the full report that will help.
Set,
Here you go. Thanks!
Column Report.pdf
I'm trying to upload the file, but it is not working. Is there a different way I can send you?
Secure File Upload
Ram Elements Zipping a Model- https://communities.bentley.com/products/ram-staad/w/structural_analysis_and_design__wiki/39895/zipping-a-model