Oscillation of a prestressed span structure of a reinforced concrete railway bridge with mass in horizontal motion

Abstract

This work examines the features of calculating the strength of reinforced concrete railway bridges with a moving load and a movable oscillator. The methods of finite elements and finite differences were used. When solving the problem of oscillations of a beam with distributed parameters under the action of a moving concentrated force and mass, "parasitic oscillations" are eliminated by choosing a step in time depending on the speed of the load's movement. As an example for moving cargo or mass, the mass of the Talgo locomotive was taken. Such a mass velocity has been determined that it is possible to use the model of the force moving with a lower velocity, otherwise the model of the oscillator must be adopted. With an increase in the horizontal velocity of the oscillator, the deflection of the beam increases, and the vertical oscillations of the mass also increase.