INTRODUCTION TO BEAM THEORY
For a more accurate and detailed explanation of beam theory, see Ref. [1]. For an advanced beam theory see Ref. [2].
References
[1] Bauchau, O. A. and Craig, J. I, Structural Analysis: With Applications to Aerospace Structures (Solid Mechanics and Its Applications), Springer, New York, 2010.
[2] Hodges, D. H., Nonlinear Composite Beam Theory, AIAA, Reston, Virginia, 2006.