护轨对桥上无缝线路稳定性的影响

Guard Rail's Influence on the Stability of Continuously Welded Rail on Bridge

运用ANSYS软件,建立铺设护轨的桥上无缝线路有限元模型,研究护轨中集聚不同温度力对桥上无缝线路稳定性的影响。结果表明:对于采用50kg·m-1钢轨铺设护轨半径大于1 200m和采用60kg·m-1钢轨铺设护轨半径大于800m的曲线线路,当护轨中集聚小于20℃的温度力时,铺设护轨可提高桥上无缝线路的稳定性,而对于采用50kg·m-1钢轨铺设护轨半径小于1 200m和采用60kg·m-1钢轨铺设护轨半径小于800m的曲线线路,当护轨中集聚大于20℃的温度力时,铺设护轨则会不同程度地降低桥上曲线无缝线路的稳定性,且半径越小,线路稳定性的降低越明显;对于桥上直线无缝线路,采用50或60kg·m-1钢轨铺设护轨后,当护轨中集聚小于30℃的温度力时,桥上无缝线路稳定性均可得到提高,且护轨温度力越小其稳定性提高程度越高。通过减小护轨中的温度力,可减少伸缩调节器的使用,提高桥上无缝线路铺设的温度跨度。

Using the ANSYS software,a finite element model of continuously welded rail on bridge(BCWR for short) with guard rail was established,the influences of different temperature force aggregated in guard rail on BCWR stability were investigated.The results indicate that,the BCWR stability of segments that the curve radius is larger than 1 200 m with 50 kg·m-1 guard rail and curve radius is larger than 800 m with 60 kg·m-1 guard rail can be improved when the guard rail temperature force is less than 20℃,but that of segments that the curve radius is less than 1 200 m with 50 kg·m-1 guard rail and curve radius is less than 800 m with 60 kg·m-1 guard rail may be decreased at different levels when the temperature force is more than 20℃.The smaller is the curve radius,the more explicit is the decrease of BCWR stability.For the straight line segment with 50 or 60 kg·m-1 guard rail,when the guard rail temperature force is less than 30 ℃,BCWR stability can be improved.The less is the temperature force of guard rail,the larger is the improvement of BCWR stability.Through reducing the temperature force of guard rail,the expansion rail joints can be decreased,and the temperature span of BCWR can be enlarged.