FAQ 002016 EN-US

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I would like to calculate the effective lengths for a frame column in the frame plane with RSBUCK or RF-STABILITY. Which load case or which load combination do I have to apply?

Answer

RF‑STABILITY and RSBUCK perform an eigenvalue analysis for the entire model with a certain state of the axial force. Depending on the required number of eigenvalues, the results show the critical load factors with the corresponding buckling curves, and the effective length about the major and the minor axis for each member, depending on the mode shape. Since each load case usually has a different axial force state in the elements, there is a separate corresponding effective length result for the frame column for each load situation. The buckling length for which the column buckles in the frame plane is the correct length for the design of the respective load situation. Since this result may be different for each design due to the different load situations, the longest effective length of all calculated analyses is assumed as equal for all load situations.

Keywords

effective length load case eigenvalue column

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  • Updated 02/15/2021

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