RESEARCH OF STRESS-STRAIN STATE AND NATURAL FREQUENCIES AND WAVEFORMS OF BRIDGE CONSTRUCTIONS VIBRATIONS

Abstract

The process of creating a prototype model of an arched railway bridge and calculation of its natural frequencies and vibration modes and the stress-strainstate at all design stages are considered. Autodesk Іnventor is used for geometry modeling, and Autodesk Nastran In-CAD and Autodesk Simulation Mechanical are used to calculate the finite element model. Based on the geometric data, a beam bridge model for two railway tracks was created. Using analysis of the stress-strain state, profiles were selected for certain groups of structure elements under conditions of equal stress margin. Using the parameters of the beam model, a surface model was constructed for a more accurate analysis of the stress-strain state, especially at the joints of several profiles. The calculation of natural frequencies and waveforms is performed at each stage of modernization (improvement) of the bridge's geometric parameters to verify the integrity of the finite element model. In conclusion, given natural frequencies of the structure will be used in the further design of the railway tracks