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This is not torsional buckling, buckling is a brutal phenomenon (very quick). Since you're using a C channel beam and i presume the load applied is not passing through the shear center, the twisting is caused by the resulting torque
This is not torsional buckling, buckling is a brutal phenomenon (very quick). Since you're using a C channel beam and i presume the load applied is not passing through the shear center, the twisting is caused by the resulting torque