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The Wikipedia article on Timoshenko beam theory says:

The model takes into account shear deformation and rotational bending effects,

I am familiar with shear deformation, but what is meant by "rotational bending"? Google search yields no good explanations of the term, so what do we mean by that? What kind of rotational bending does the Timoshenko model account for that the Euler beam model does not?

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  • $\begingroup$ Why not check the Timoshenko original text instead of wikipedia? $\endgroup$ – Solar Mike Jun 5 at 11:48
  • $\begingroup$ If used to say "rotational inertia effects" before some know-all (or know-nothing) edited it. $\endgroup$ – alephzero Jun 5 at 12:49
  • $\begingroup$ @alephzero "If" - you do mean "it", as in the Wikipedia article? $\endgroup$ – S. Rotos Jun 5 at 15:37
  • $\begingroup$ @S.Rotos Yes. But you can't correct typos in comment after 5 minutes. There have been so many edits to that page I got bored trying to track down exactly when it happened (and possibly revert it, depending on what else was in the edit). $\endgroup$ – alephzero Jun 5 at 16:15
  • $\begingroup$ {This is from memory; please bear with.} If I recall correctly, the Tim. beam theory does not assume that plane sections (specifically those normal to the beam axis) remain planar. This is in distinct contrast to Euler-Bernouli beam theory, which does assume that. HTH $\endgroup$ – Catalyst Jun 5 at 16:25

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