Modelling and Numerical Simulation of Symmetric Vibrations of the Kni 140070 Viaduct – – Ballasted Track – Ktx Train System

The paper develops a new methodolog y of FE modelling and simulation of the bridge – track – moving train system with the use of CAE systems. The KNI 140070 viaduct of span length 14.40 m, located on the Polish Central Main Line, has been selected. The modernized track contains: 60E1 main rails equipped with Vossloh 300-1 fasteners, 60E1 side rails with SB3 fas teners, B 320 U60 sleepers, crushed stone ballast, approach RC slabs. A KTX (Korea Train eXpress) high-speed train, bei ng a modification of a TGV train, is taken into consid eration. A methodology of physical and numerical modelling of the viaduct, the track and the train was developed using Altair HyperMesh and LS-PrePost software. The FE model of a bridge superstructure consists of 4-node shell elements (main beams) and 8node 48 DOF solid elements (reinforced concrete platform). RAIL_TRACK and RAIL_TRAIN modules available in LS-Dyna system were applied for si mulating the train – track interaction. Hughes-Liu beam elements were used f or the rail model ling. Rail fastenings were simulated using one-dimensional discrete spring and damper elements. Carbodies, bogie frames and wheelsets were considered as rigid bodies and they were modelled using shell and beam elements. Cylindrical and revolute constrained joints and discrete springs and damper s were applied to connect all components of the FE model of rail-vehicles. The exemplary simulation of transient vibrations of the bridge – track – train system has been made for service velocity 300 km/ h. Contours of displacement and stress and selected tim e histories for displacements, accelerations and stresses, created in LS-PrePost and HyperView software, have been analysed.