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How does the choice ‘1st or 2nd order calculation’ affect the buckling lengths

There are 3 methods to calculate the buckling lengths:

  • Non-displaceabable nodes (syn.: non-sway buckling lengths)
  • Semi-displaceabable nodes
  • Displaceabable nodes¬†(syn.: sway buckling lengths)

The prefered method depends on the sway or non-sway character of the building and if global imperfections have been taken into account.

The diagram below gives an overview. The red paths are possible in Diamonds.¬†The ‘*’ means that instead of non-sway buckling lengths, you may also use the semi-displaceable nodes as a conservative alternative.

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