Safety and comfort study of vibration-reduction pad floating slab applied to No.9 turnout
The subway turnout area has a large number of discontinuous rail segments at the stock rail,switch rail,and turnout rail joints.The interaction between wheel and track is strong,and the vibration of track system is drastic.Vibration-reduction pad floating slab track has been applied as an advanced vibration-reduction measure in subway turnout area.To explore the applicability of applying vibration-reduction pad floating slab to the No.9 turnout,and the feasibility of serving as a transition section between the vibration-reduction segment and the ballastless track.This paper took the No.9 turnout of the subway elevated line as the research object to establish a three-dimensional finite element model of the turnout on bridge.In the conditions of B-type subway vehicle passing through the turnout at a straight speed of 120 km/h and a lateral speed of 30 km/h,this paper analyzed the safety and comfort,as well as the structural deformation below rail.Then the article evaluated the advantages and disadvantages of two stiffness transition methods in the No.9 turnout area,as well as corresponding vibration-reduction effects.Finally,the feasibility of installing vibration-reduction pad floating slab was demonstrated in the No.9 turnout area.The research results are shown as follows.1)When the train passes through the No.9 turnout area with vibration-reduction pad floating slab,the maximum displacement of the floating slab occurs in the switch area and the point rail area,the largest displacement occurs in the switch rail.Increasing the support stiffness of the single-slab vibration-reduction pad at the switch rail can realize uniform deformation of the track structure.2)When the train laterally passes through the turnout area with vibration-reduction pad floating slab and transition section,the two-stage transition method outperforms the one-stage transition method in terms of maximum vertical acceleration,maximum lateral acceleration,maximum derailment coefficient,maximum wheel load reduction rate,change rate of track stiffness,and vibration-reduction effect.3)Installing vibration-reduction pad floating slab in the turnout area can satisfy the evaluating indicator of safety and comfort during straight and lateral passing,with the two-stage transition method being superior.The research results can provide a theoretical reference for subsequent studies on vibration-reduction design in turnout areas.
vibration-reduction pad floating slabturnouttransition segmentvehicle-track coupling dynamicschange rate of track stiffness
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