桥墩刚度、跨度及小阻力扣件对钢轨强度的影响-《高速铁路技术》

文章信息/Info

Title:: The Influence of Pier Stiffness, Spans and Small-resistance Fasteners on the Rail Strength

Author(s):: SU Qiankun; DENG Xi; LU Ye; JIANG Wanhong; China Railway Eryuan Engineering Group Co., Ltd., Chengdu 610031, China

Keywords:: continuous girder bridge|pier stiffness|bridge span|small-resistance fasteners|rail strength

摘要:: 文章基于有限元法和梁轨相互作用理论，以（90+180+90）m长大连续梁为例，建立桥上无缝线路计算模型，分析了长大连续梁桥墩刚度、桥跨和小阻力扣件设置对无缝线路钢轨强度的影响。结果表明：（1）连续梁大温跨一侧边跨墩刚度或主跨固定支座墩刚度的增加，引起钢轨最大附加伸缩应力增加，当桥墩刚度增加至一定水平时，钢轨总应力逐渐趋于收敛；（2）减小温跨长度可有效降低钢轨总应力，温跨相同时，温跨中部活动支座的设置位置对最大伸缩附加应力和最大制动应力影响很小；（3）当钢轨总应力超限时，建议将小阻力扣件布设在钢轨伸缩附加力最大处（通常位于连续梁与简支梁相接处）的相邻两跨简支梁和连续梁边跨。

Abstract:: Based on the finite element method and the theory of girder-rail interaction, this paper takes (90+180+90) m long continuous girder bridge as an example, establishes a calculation model for the continuously welded rail track on the bridge, and analyzes the influence of pier stiffness, spans and small-resistance fasteners of continuous girder bridge on the continuously welded rail strength. The results show that:(1) The increase in the stiffness of the side span pier of the large temperature span of the continuous girder bridge or the stiffness of the fixed bearing pier of the main span causes the increase of the maximum additional expansion stress of the rail. When the stiffness of the bridge pier increases to a certain level, the total stress of the rail gradually tends to converge. (2) The decrease in the length of the temperature span can effectively reduce the total stress of the rail. When the temperature span is the same, the setting position of the movable bearing in the middle of the temperature span has little effect on the maximum additional expansion stress and the maximum braking stress. (3) If the total stress of the rail exceeds the limit, it is recommended to arrange the small-resistance fasteners on the side spans of the two adjacent simply-supported girder and continuous girder where the additional expansion stress of the rail is the greatest (usually at the junction of the continuous girder and the simply-supported girder).