The paper examines a six-span, equal-strength beam used in modern construction to create stable and efficient structures. The main characteristics and advantages of equal-strength six-span beams are noted: a multi-span, equal-strength beam differs from other types of beams by having the same strength along the entire length of the beam and ensures uniform load and stress distribution. Six spans separated by supports make it possible to distribute the load on the building structure more efficiently, while reducing bending and deformation of the building structure. In an equally strong multi-span beam, all sections have the same shape and dimensions, which simplifies calculation and design. With the reduced weight of the multi-span beam, in comparison with traditional beams, its strength and rigidity remain. A numerical calculation has been performed in the Python programming language for the maximum calculated tangential stress depending on the cross-section height of a six-span beam at different values of its span lengths. The loads that a multi-span beam can withstand are determined, as well as ensure its reliability, strength and safety during the operation of the erected building structure. Based on the results of the calculations performed, graphs of the dependences of normal and tangential stresses on the height of the section in a six-span beam are constructed. The dependence of stresses in the cross section of an equal-strength six-span beam on the length of its span has been established.