Looking into modeling up a curved steel stair stringer made out of flat plate (including welded steel plate treads). In doing so, I've got discreet members that run from the ground to the landing that I was hoping to model up as a plate section (say 3/4" x 10" for sake of discussion). I have no issue modeling this up or assigning section sizes - the issue I have is when looking at my design results. Although the system is behaving as I'd expect, it appears that the design results (are only taking into account the yielding mode from AISC in equation (F11-1). No matter how slender I make my plate element (1/2" x 10", 1/4" x 10", etc), I do not see any checks for the LTB of the bar section per equation (F11-2). Is there a known workaround to this in Elements?
Thanks Seth! I had overlooked the option.
I probably used the RectBar section template. For more see: Creating custom Sections, Materials etc. in RAM Elements [TN]
May I please learn how you managed to model the rectangular bar section?
Yes, the expectation is that height is the larger dimension. I now remember this came up once before.
Sorry - the version I sent had the wrong member orientation (was oriented such that 1" was the depth). The original orientation (8" as the depth) still produces the same issue. These were all based on a section property with a height of 1" and a widthof 8".
That said, changing the section property such that the height is 8" and the width is 1" produces the correct result no matter what the orientation is in the model. It appears that for the slenderness checks it will use t = width and d = height no matter what the orientation of loading, correct? Either way, I think that does the trick - thanks!