Chengshi guidao jiaotong yanjiu (Jun 2024)
Study on Anti-overturning Characteristics of 60R2 Groove Rail and CHN60 Rail for Fastener Type Ballastless Track of Tram
Abstract
Objective In order to provide theoretical support for the selection and design of the tram rail and fasteners in different sections, it is necessary to study the anti-overturning characteristics of the 60R2 groove rail and the CHN60 rail for the fastener type ballastless track, and analyze the influencing factors of their anti-overturning performance. Method The finite element method is used to establish a simplified analysis model for 60R2 groove rail and CHN60 rail. The effects of the vertical stiffness of different rail pads, lateral stiffness of fasteners, spacing between fasteners, and 2 mm and 5 mm looseness of fastener clips on the lateral displacement of rails, the vertical displacement of fastener clips, the lateral force borne by fasteners, and the contact length between rails and pads are analyzed. Result & Conclusion The simulation study shows that the torsional stiffness of CHN60 rail is about 173 times that of 60R2 groove rail, and the vertical force eccentricity of CHN60 rail is greater than that of the 60R2 groove rail. Under the same working conditions, the lateral displacement of 60R2 groove rail and the vertical displacement of its fastener clip are larger than those of CHN60 rail, but the fasteners of 60R2 groove rail bear less lateral force than those of CHN60. The smaller the stiffness of the rail pad, the larger the spacing between fasteners, and the greater the lateral displacement of the rail and the vertical displacement of the outer fastener clips. In areas with small radius and large lateral forces, the stiffness of the rail pad should be appropriately improved, the spacing between fasteners be increased, and the amplitude of the fastener clip in fatigue test be appropriately enlarged. The main influencing factors of the lateral force that the fasteners bear include rail type, lateral stiffness, and spacing between fasteners, while the stiffness of the rail pad has a relatively small effect on fasteners. Under the present calculation conditions, the rail lateral displacement changes relatively small with the fastener clip looseness of 2 mm and 5 mm. The embedded tram track with small radius section which is difficult to inspect should be excavated and inspected regularly, and the bolts should be tightened to maintain the specified seam value of the fastener clips.
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