曲线桥上纵连板式无砟轨道横向稳定性分析

Transverse Stability of Ballastless Track with Longitudinal Connected Slab of Curved Bridge

本文建立线－板－桥－墩一体化计算模型，研究了曲线桥上主要结构参数变化对无砟轨道横向稳定性的影响。研究表明：（1）考虑双向活动支座时，在温度荷载和连续梁固定支座约束共同作用下使得钢轨、轨道板、底座板和梁体在连续梁固定支座处出现了反向旋转。（2）位移最大值出现在连续梁中间活动支座附近，梁轨横向相对位移在连续梁右端出现突变的峰值。桥上纵连板式无砟轨道的横向位移是轨道结构的横向力引起梁体产生横向位移。（3）随着活动支座摩擦系数的增大，各部件横向位移逐渐减小。

This paper establishes a track-slab-abutment integrated mechanical model to study the influence of main struc-tural parameters on curved bridge about lateral stability of ballastless track.The results show that firstly,when movable support exists,which is free in two directions,counter rotation appears in the rail,slab,support layer and fixed abutment of the continuous beam due to temperature effect together with fixed abutment restraint.Secondly,maximum displacement exists at the movable support in the middle of continuous beam,while the lateral relative displacement between beam and track shows a peak value on the right side of continuous beam.Longitudinal connecting plate moves in lateral direction for the lateral force from track.Thirdly,the lateral displacement of every component decreases with the increase in friction co-efficient of movable supports.