In this note the bending of uniform straight beams of unsymmetrical cross-section is investigated by matrices. The importance of the matrix of the inertia tensor of the cross-section is shown. Matrix formulae are presented for the normal stress, the flexural shearing stress in the case of thin-walled open sections, and the deflection curve in the case of small displacements. Matrix formulation makes this problem easy to handle; and so it provides an aid in teaching the subject.
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