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I have a couple of helpful attachments that will make the following discussion easier to understand.
The first is an output from the Steel Construction Institute's Frame Stability tool. It relies on the same basic principles of EC3 to calculate the Alpha_cr value of a simple braced frame.
The second is an equivalent Robot model.
I've tried to produce the same basic steel frame in both the SCI tool and in Robot, with the same loading. Subsequently, I followed this Robot guidance (https://knowledge.autodesk.com/support/robot-structural-analysis-products/troubleshooting/caas/sfdca...) to get an alpha_cr value from Robot.
In the SCI output, I get three alpha_Cr values (one for each storey) and the lowest is at the lowest storey (as expected). In the Robot model, in the Buckling Analysis Results table, I only get one number (presumably for the whole building) and it's similar to the lowest output value from the Frame Stability tool. However, if the Robot output is only giving me one result, I would assume it's for the overall frame (from ground to roof level). Can I get some confirmation as to how Robot is getting this singular result, and how I might get a result for each storey -- the recommended check for sway.
Solved! Go to Solution.