We are seeing over 1000+ errors in our RAM SS model and most of the errors we are receiving compromise of the following 2 errors:
1. Not enough studs for 25% composite action2. Not enough studs for Stud ductility requirements (50% composite or 16k/ft)
AISC Section I commentary discusses that the "25% composite min" language is replaced with considering ductility, with the exceptions of beams with an average of 16k/ft shear connector capacity - which equates to roughly 1 stud/ft. Wouldn't this discussion clear the 2 errors stated above?
In addition, my understanding from similar forum questions is that we cannot automate a minimum no. of studs per foot, we manually must change each beam stud count - may you please confirm?
I'm trying to see the most efficient way to resolve the myriad errors we are seeing, but seem to run into issues to clear them out. Any help or insight would be much appreciated! Thank you in advance.
It might help to see your model to check the beam length, size and deck. The ductility check for AISC 360-16 Commentary I3.2d(1) is optional (Criteria - Stud criteria), but the 25% lower limit is not, at least for optimized beams. You can get around that by changing the criteria "For Design Warnings to - Use Composite properties" and then specify the studs through the view/update dialog. There will still be warnings, but the design report will be accurate as a composite beam with a smaller Percent Composite.
You can specify a max stud spacing to enforce 1 stud per foot (or less).
See also: https://communities.bentley.com/products/ram-staad/w/structural_analysis_and_design__wiki/2053/ram-steel-beams-faq
Thank you Seth! Since the ductility check is optional per code, is there an option to not enforce this in the design?
You can by assigning a specific size and stud count, but the optimized member designs will always copley (if possible).