Dynamic performance of pedestrian overpass superstructures over high-speed railway tracks

Pedestrian overpasses over high-speed railway tracks are among the most aerodynamically exposed to high-speed trains. Due to the familiar wave nature of the aerodynamic action of moving rolling stock and the relatively small mass and rigidity of the structures under consideration, a significant dynamic reaction may occur in the latter The aerodynamic effect of a moving train is found to have a complex two-component nature, consisting of the primary excitation of the head air wave structure and secondary excitation related to the periodicity of the head, tail and intermediate (for double trains) Air waves. The coincidence of any of the design frequencies with the primary and/or secondary excitation frequency may cause a significant dynamic response of the design to the effect, directly affecting the possibility of its safe and comfortable operation. The article provides results of studies of dynamic reaction of pedestrian overpasses to aerodynamic impact by numerical modelling methods on the example of a planned structure in the train station complex of high-speed railway track Saint-Petersburg – Moscow. The maximum values of acceleration, displacement and dynamic coefficients in both horizontal and vertical directions were determined from the simulation results. It was established that the magnitude of the dynamic reaction of the structure is determined not only by its own characteristics, but also by the parameters of the high-speed train (length and configuration). It was also revealed the inadequacy of the existing regulatory framework for the normalization of maximum accelerations at the level of the passage of pedestrian bridges and overpasses, with proposals to update the existing regulatory framework with the implementation of appropriate scientific research work by relevant institutes.

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