No abstract

the article provides a calculation justification of the proposed railway structure on a reinforced concrete sleeper-free base, for which an analysis of the existing methodology for calculating the railway track for strength is carried out, according to which for a railway track on a sleeper-free base, dynamic loads acting from the rolling stock on the track are determined. The analysis of the applied sleeper-less structures of the railway track and the results of measurements of emerging stresses in the substructure, the measured depth of the core are carried out. Using the previously obtained results of studies of the depth of the core, the justification of the required height of the embankment and the calculation of the parameters of the subplate base is carried out. Next, the finite element method calculates the bending stresses arising in the bearing plate, where the maximum is 1.82 MPa and is compared with the permissible value, which is much greater for a reinforced concrete slab. Also, the result is the obtained elastic vertical movements, which indicate a more uniform distribution of the load from the rolling stock on the roadbed.

Nowadays, design and construction of new urban tramlines require feasibility study of calculation methods for stiffness. A calculation method for tram track stiffness with noise and vibration insulation systems has been developed in this paper. Theoretical analysis of the impact of rail insulation systems on tram-to-slab load transfer has revealed the potential options and factors influencing the choice of a system. The new design method obtained makes it possible to predict the distribution of loads on the load-bearing foundation surface. Different variants of rail/slab load distribution have been determined depending on the mechanical characteristics of rail profiles. Tram track slab stiffness has been calculated for three design models such as rigid surface pavement, bridge structure and foundation slab. The design of the tram track as foundation slab allows calculating slab reinforcement as accurately as possible because the surface pavement takes into account the planned service life and tram flow density in the area under survey.Field experiments have demonstrated a better convergence of theoretical and experimental data when designing the slab as foundation. As a result, a new method for calculating the foundation slab stiffness of a tram track has been proposed taking into account planned service life, tram flow density and other factors.