Analytical Modeling of the Dynamic Behavior of the Railway Track on Areas of Variable Stiffness

The chapter is devoted to transition sections of the interference in a railway track of the different design and stiffness parameters of the subgrade. The objective of the research is the improvement of technical solutions to arranging transition sections of the track on high-speed lines. To achieve the aim, an analytical model of the investigated section of the railway track was created and the calculation of stress-strain behavior of this model was carried out. During analytical modeling, we determined the values of stresses, deformations, and forces arising in certain structural elements, as a result of rolling running. The analysis of the obtained results allows to identify the elements of the track structure susceptible to the development of destructive processes. The offered model can be recommended as the algorithm for selecting stiffness parameters (deformation and shear moduli) of the track structure, the base and body of the subgrade, when trains move at different speeds and with different axle loads.