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For I sections, channel sections, RHS (Rectangular Hollow Section) sections, T sections, rectangular sections, and asymmetric I sections, the critical LTB moment is given in F1 and Appendix F1.
For angle sections with symmetrical legs, the critical LTB moment is given in Ref. [1], pp.281-288, “Specification for Load and Resistance Factor Design of Single-Angle members”.
For the other supported sections, the elastic critical moment for LTB Mcr is given by
with
See also Ref. [2], part 7.
Haunched sections (I+Ivar, Iw+Plvar, Iw+Iwvar, Iw+Ivar, I+Iwvar) and composed rail sections (Iw+rail, Iwn+rail, I+rail, I+2PL+rail, I+PL+rail, I+2L+rail, I+Ud+rail) are considered as equivalent asymmetric I sections.