This video explains the major weakness of the "I-shape". The main topics covered in this video deal with local and global buckling as well as torsional problems around I-beams. We compare different shapes of beams and analyze their behavior under eccentric loads. The inability of the I-beam to carry torsional loads is illustrated through a numerical example.
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References:
[1] R. Beardmore, "Torsion," 2005. [Online]. Available: https://roymech.org/Useful_Tables/Torsion.html.
[2] A. F. Hughes, D. C. Iles and A. S. Malik, Design of Steel Beams in Torsion, Ascot: The Steel Construction Institute, 2011.
[3] B. J. G. James M Gere, Mechanics of Materials, Stamford, Conn., 2009.
[4] A.F.F. Dynamics Laboratory, Beam Torsion: Stress Analysis Manual, 1986.