In this the basic questions of Strength of materials are consistently, among them: basic concepts and hypotheses of resistance of materials; calculations are on durability and rigidity of elements of constructions, which work on compression and tension, on direct shear and twisting; a construction of beams is on durability; methods of determination of deformations of beam; double - integration method, Castiglianos theorem and Verescagins rule, their application, is for determining the unknown reactions of statically indeterminate of beams and frames.