Force Transmission and Service Performance of Assembled Sliding Chair in High-speed Turnout
In order to investigate the causes of fatigue damage to the stock rail bottom in high-speed railway turnouts,a study was conducted on the force transmission characteristics and service performance of the assembled sliding chair.The stress analysis model for the stock rail in switch area was established to study the stress characteristics of the stock rail under the condition of sliding chairs with two-points and shim fastening.Meanwhile,the influence of two-points and shim fastening sliding chair on the service performance of the stock rail was evaluated according to the fatigue test of stock rail bottom material and the fatigue experiment of assembled switch structure.The results show that stress concentration on the bottom of the stock rail is formed by the two-points sliding chair,with the lower surface of rail bottom corresponding to the fastening points being mainly under tension.Under the fatigue load of 130～190 kN,the two-points fastening slid-ing chair can achieve a maximum stress of 611.2 MPa at the bottom of the stock rail,which has exceeded the fatigue limit of the stock rail bottom material,while the maximum stress at the bottom of the stock rail corresponding to the shim fastening sliding chair is 237.5 MPa,50％～60％lower than the two-points fastening sliding chair.The assembly state of the switch structure has significant impact on the service performance of the stock rail.The stress at the bottom of the stock rail is closely related to the contact state of switch rail and sliding chair.
high-speed turnoutstock rail fatiguesliding chairforce transmission characteristicsfatigue test
万方数据
维普
