Section Strength – Buckling Coefficient

Using the buckling coefficient chart shown here we observe that as the aspect ratio (a/b) approaches 2, the buckling coefficient (kc) can be considered constant for a defined edge boundary condition.

Depending on the section, the edge boundary conditions can fall between fully constrained (Curve A) and simply supported (Curve C). For this example we will assume a balance between simple supported (kc = 4) and fixed (kc = 7), so kc will be 5.5.