How can I calculate the lateral torsional buckling of cruciform-shape steel?

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Ian Macphedran

These aren't simple cruciforms - they are crossed "I" shapes, and warping effects may come into play. It is certainly not a common shape for beams. What is the specific application you're using it for?

If IMCA is providing geometric information on these, they might also have some design guidance for you.

http://www.imca.org.mx/IMCA/Contacto.html