Interaction Between Simply Supported Beams And CRTS Ⅱ Slab Ballastless Track

Abstract:As a new type of Longitudinal connected ballastless track, CRTS II slab ballastless track is laid continuously on the bridge connected by sliding layer and shear alveolars. the mechanical properties of track and bridge system is extremely complex in load cases of vehicle braking, expansion and vertical train load. It is necessary to do research on its interaction mechanism and adaptability.Researches conducted on the interaction between simply supported beams of high speed railway and CRTS II slab ballastless track in this dissertation. The main contents included:(1) Taking the standardized32m span simply supported high speed railway bridge for instance, parameters’ value are investigated and an integrated finite element model considering rail, track slab, base plate, deck,pier and abutment is established.(2) The stresses and deformations of CRTS II longitudinal connected ballastless track on bridge under the braking forces of the train, temperature loads and vertical train loads were studied. The concept of vertical bending moment was put forward and the interaction law between simply supported bridges and CRTS II slab ballastless tracks is revealed as well.The beam-track finite element models to analyse the interaction between multi-span simply supported beam with ballast track and CRTS I slab ballastless track are established.The difference of beam-track interaction between CRTS II slab ballastless track, ballasted track and CRTS I slab ballastless track was compared.(4) The influence factors of track-bridge interaction were explored, including expansion stiffness of bed slab, friction coefficient of sliding layer, longitudinal resistance of fastenings, presence of shear alveolar, length of spans, bridge structures, stiffness of piers and length of friction slabs. Have had drawn some conclusions about some influence rules of longitudinal force by the above factors on structural layers and connection components.