Lateral rigidity and overturning resistance coefficient test of fastener system:taking WJ-8 fastener as an instance
In order to study the lateral rigidity and overturning resistance coefficient of the fastener system,firstly,the lateral mechanical behavior of rail was analyzed based on the equally spaced elastic point supported beam model.Secondly,considering the cros-section characteristics of rail,the calculation formula of lateral rigidity and overturning resistance coefficient of the fastener system were derived.Finally,the lateral loading tests of 1 set and 3 sets of WJ-8 fasteners were designed and carried out to verify the rationality of the analysis and derivation.The results show that the overall torsion center of the rail is the center point of the rail bottom,and the self-torsion of the rail is not negligible.The transfer process of the lateral force and torque of the rail is a nonlinear process.The relative error between the results of the lateral displacement obtained from the single set and three sets of fastener tests is not more than 6.8%,and the relative error between the results of the rotation angle obtained from the single set and three sets of fastener tests is not more than 9.5%.Three sets of fastener test allows for a wider loading range and is more suitable for asymmetric fasteners.The rail traverse process of WJ-8 fastener can be divided into three stages according to the composition of the lateral reaction force of the fastener,including rail slip,linear deformation and nonlinear deformation.The rail overturning process can be divided into two stages according to the contact form between the rail bottom and the rail pad,including rail emptying and overall overturning.The lateral stiffness and overturning resistance coefficient of the fastener system can be determined from the lateral force-displacement curve and the torque-rotation curve.
fastening systemlateral rigidityoverturning resistance coefficientWJ-8 fastenertransverse loading test
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