Whereas in the classical Bernoulli beam theory it is assumed that the cross-section of a member remains perpendicular to the member axis when deformed, the shear sliding is considered for the Timoshenko beam theory (flexible beam). As a result, the cross-section of a member no longer remains perpendicular to the member axis when deformed (see Figure 01). By assuming that the cross-section remains planar, it results in a uniform shear stress distribution along the beam height. However, since the distribution is parabolic, a shear correction factor is taken into account for the determination of shear areas. This is 5/6 for a rectangular cross-section.