Study Of Dynamic Coefficient On Crts Ⅰ Slab Track

Unballasted Track is the structures with repeatedly temperature loads and train loads, each train load will cause unballasted track failure. Therefore, the study of statistical of CRTS I slab track’s wheel-rail power under random irregularity incentive has important significance. Meantime, the study of unit slab track’s dynamic coefficient has some practical significance for unballasted track design.On the basis of the collection, analysis, absorbing domestic and foreign studies, this article established vehicle-track vertical coupling vibration model by vehicle-track vertical coupling kinetic theory. This article carried on numerical calculation by finite element software ansys/ls-dyna. This article investigated the law of wheel-rail power and unit slab track’s dynamic coefficient. Include the following:Collection of domestic and foreign application status of unballasted track; Detail of the track irregularity and statistical analysis methods of train load; Establishment of vehicle-track vertical coupling vibration model; Statistical analysis of wheel-rail power, analysis of fastener stiffness and wheel-rail power influence on the statistical laws of wheel-rail power; investigate wheel-tail power’s dynamic coefficient and CRTS I slab track’s dynamic coefficient, analysis of fastener stiffness and wheel-rail power influence on wheel-tail power’s dynamic coefficient and CRTS I slab track’s dynamic coefficient.Through the above work, we find wheel-rail power in line with normal distribution; In the statistical characteristics parameters of wheel-rail power, average change a little with the increase of speed, standard deviation increases with increasing speed, coefficient of variation increases with increasing speed; In the statistical characteristics parameters of wheel-rail power, average change a little with the increase of fastener stiffness, standard deviation increases with increasing fastener stiffness, coefficient of variation increases with increasing fastener stiffness; Wheel-tail power’s dynamic coefficient and wheel unloading rate increase with increasing speed and increase with increasing fastener stiffness; Wheel-tail power’s dynamic coefficient recommended value is1.65, wheel unloading rate recommended value is0.65; The dynamic response of track increase with increasing speed, the dynamic response of track increase with increasing fastener stiffness, track’s dynamic coefficient is weaken from top to bottom; Slab’s dynamic coefficient recommended value is1.20, mortar layer’s dynamic coefficient recommended value is1.18, concrete base’s dynamic coefficient recommended value is1.16, subgrade surface’s dynamic coefficient recommended value is1.15.