Design of bridge crossings with the distribution of bending and torsional stiffness over the height of the superstructure

Introduction. Currently, the development of transport highways is strictly linked to urban agglomerations, regional and international logistics corridors, therefore, the urgency of creating multi-level transport interchanges near main hubs is growing. At the same time, it is important to ensure static and kinematic dimensions at various levels of overpasses and underpasses. The article proposes to avoid default usage of beam, arched or truss superstructures and considers a two-support superstructure as an element on which the load from the vehicle is applied to the middle part of the height of the cross-section.
Materials and methods. Several standard superstructure designs for automobile and railway transport modes were considered. According to the available engineering solutions, proposals were developed for dividing the cross-section of the superstructure into an upper and lower part relative to the plane of application of the train dynamic load. The stiffness parameters of the superstructure section are represented as a function of orthogonal spatial coordinates. Linearisation method is used as the solution method of the desired functions on elementary time intervals in order to solve the defining differential equations.
Results. Dynamic vertical displacements of the superstructure cross-section points are obtained depending on the type of section and the distribution of the stiffness function over height. Variation of the geometric parameters of the bridge span cross-section in the range of permissible values enables to change the maximum movements of the cross-section points to keep them in the line of standard values, which may be in demand during calculation of the structure for the f irst and second groups of limit states.
Discussion and conclusion. The presented model is simplif ied and does not consider a number of factors, such as damping in the structural material, irregularities on the surface of the traff ic area and the interaction of the rolling stock wheels with the superstructure. Further research may be aimed at developing more accurate mathematical models that take into account a wide range of factors affecting the dynamic behaviour of bridge crossings. It also seems promising to conduct experimental studies on real structures, which would allow to verify the calculated obtained data and develop practical recommendations for optimising the design of bridge crossings with the distribution of bending and torsional stiffness over the height of the superstructure.

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