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In this paper, we study the methods for calculating beams with skating in the lower belt of both the Ibeam and box sections. Based on the dependences presented in the existing methods, the stress-strain state of single-beam bridge cranes was calculated at the points of contact of the wheels of the hoist and beam belt, with a box section with rolling along the bottom. Box-section crane cranes have greater rigidity and stability compared to the I-beam section, in addition they allow you to increase the span without sacrificing the crane's lifting capacity. SolidWorks Simulation also performed a finite element analysis of the stress-strain state of boxsection beams with skating along the lower belt. The main advantage of the finite element method is the ability to split into finite elements areas of any shape and, thus, the ability to calculate the stress and strain fields in real details, taking into account all their design features, which ensures high accuracy of the calculation. On the basis of the results obtained, the dependences of stresses on the thickness of the lower girder beam, the position of the hoist wheels were studied, an approximating function was constructed, and a simpler engineering calculation method was proposed that allows one to reduce the number of calculations

The paper deals with the impact of the controlling system adjustment on the level of the dynamic loads operating on the hoisting machine parts during the period of the non-steady motion. The impact of the operating regime of the hoisting machine generalized mechanism on the consistency of operation and the variation of the parameters of the mechanism controlling system with the electric drive and frequency converter is experimentally shown. The procedure of the experiment is described; there are given the comparative results of the variation of the mechanism performance when it works using the controlling system with the frequency converter and brake resistor, and without it, when working on the natural parameters. There are conclusions about adequacy of the normative method for the dynamic coefficient option, determining the loading of the hoisting machine metalware, and in case of occurrence of adjustment errors in the frequency converter controlling system.