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STUDY OF THE DYNAMIC SUPPORT REACTIONS IN THE TWO-SPAN BRIDGE FARM UNDER ACTION OF MOVING LOAD

. In this article, we study the dynamic support reactions that occur in a two-span bridge farm, due to the impact on the superstructure of the moving load. The most interesting is the study of horizontal support reaction. Both the span and the moving structure are deformable elastic systems. The interaction forces between the rolling stock and the span structure are obtained by solving a contact problem. For numerical modeling, the method and the corresponding computer program developed at the Department of Structural Mechanics were used. The method of solving the equations of motion is based on an explicit integration scheme with extrapolation according to Adams. When obtaining the results of the solution, the internal friction forces in the material were taken into account using the generalized Prandtl model. The results obtained allow us to conclude that, under vertical action, the horizontal support reaction reaches very significant values.