All three methods in Section F.3 Local Buckling used to determine the local buckling limit state reference Sections B.5.4 and B.5.5. These sections include determining the strength of elements in pure compression and elements in flexural compression. The local buckling strength further depends on whether or not the element is supported on one or both edges in addition to the width to thickness ratio, b/t.
Sections F.3.1, F.3.2, and F.3.3 provide different variations for calculating the local buckling strength. The Direct Strength Method is the most accurate and comprehensive method. However, the Weighted Average Method is the default option in the RF-/ALUMINUM ADM detail settings because it is used in the majority of the ADM example problems.
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