Activate “Calculate critical load” in the corresponding dialog box. After the calculation, open the “Stability analysis” and display the “Results by member”. You can now read the effective lengths for the corresponding mode shapes.
But be careful! The effective lengths around the major and minor axes are only calculated using the critical load (Mcr). It is necessary to decide which buckling mode is appropriate based on the buckling mode itself.
In the example, the member is supported about both axes according to Euler case 3. Shape 1 shows buckling about the minor axis (z-axis). Accordingly, the effective length factor kcr,v is the correct factor for buckling about the z-axis. For buckling about the major axis (y-axis), you need to search for the buckling mode with the corresponding buckling direction. In this case, it is Shape 7. Accordingly, the effective length factor kcr,u is the correct factor for buckling about the y-axis.
Image 02 shows Buckling Mode 1.
Figure 03 shows Buckling Mode 7.