Beams under nonuniform bending: Shear stresses and built-up beams

This lecture covers the distribution of shear stresses in rectangular beams under nonuniform flexure, shear stresses in beams of hollow circular cross section, and shear stresses in beams with flanges. It also discusses built-up beams, their fabrication, and design considerations for connections. The lecture further explores shear flow in beams, characteristic cases, and the calculation of shear forces. An example problem is presented to determine the maximum permissible spacing of screws in a wood box beam. Additionally, the lecture delves into the superimposition of stresses in beams under flexure and axial load, including the computation of combined stresses and the Von Mises criterion for failure analysis.