VERTICAL VIBRATIONS OF STEEL BEAM BRIDGES INDUCED BY TRAINS MOVING AT HIGH SPEEDS. PART 2 — NUMERICAL ANALYSIS

摘要

The paper formulates complementary problems connected with simulation of vertical vibrations of steel beam bridges. The bridges are one-track, simply-supported, with a closed platform and a ballasted track. Vibrations of bridges are induced by passenger trains moving at high service velocities. A train is composed of rail-vehicles with four-wheel trucks and double-suspensions. The calculation algorithm for simulation of transient and quasi-steady-state vibrations has been formulated and programmed. Simulation of vertical vibrations of a series-of-types of the bridges designed in accordance to present Polish codes has been accomplished. Influence of selected factors on dynamic responses of the bridges was investigated. Capacity of the bridges to loading by high speed trains has been checked. A number of conclusions suitable in engineering practice have been formulated. The problems of physics and mathematics modelling of the bridge - track - train system have been formulated and developed in the first part of the work.