客货共线大跨度简支钢桁梁桥梁轨相互作用

以黄韩侯铁路上某156m大跨度简支钢桁梁桥为背景,采用理想弹塑性道床阻力模型,建立了轨-梁-墩一体化空间有限元模型,对钢桁梁桥上钢轨伸缩力、挠曲力、制动力以及断轨力分布规律进行了分析,探讨了相邻简支梁支座布置、桥墩顶纵向刚度、小阻力扣件布置等设计参数对钢轨纵向力的影响.研究表明:钢轨伸缩力为主要控制性荷载;相邻简支梁宜采用与钢桁梁相同方向的支座布置方式;随墩顶刚度的增加,钢桁梁桥上钢轨伸缩力和挠曲力增大,制动力减小;在钢桁梁桥上采用小阻力扣件即可以减小约36%的钢轨伸缩力.

Track-bridge Interaction of Long-span Simply Supported Steel Truss Bridge in Mixed Passenger and Freight Railway

A beam-rail-pier 3D finite element model was built by adopting the mechanism of ideal elastic-plastic ballast resistance under the background of a 156m long-span simply supported steel truss bridge on Huangling-Hancheng-Houma Railway line. The purpose was to study the distribution of longitudinal force due to temperature variations, bridge deflection, braking force and the breaking force of long rail in steel truss bridges. The influences of design parameters on longitudinal forces, such as the bearing arrangements of adjacent simply supported bridges, pier longitudinal stiffness and the arrangement of small resistance fasteners, were also discussed. It has been shown that the longitudinal force due to temperature variations plays a major role. Secondly, the bearing of adjacent simply supported bridge should be in the same direction as the steel truss bridge. Thirdly, the longitudinal force due to temperature variations and structural deflection increases and the braking force decreases as the pier longitudinal stiffness increases. Finally, the small resistance fasteners have a good effect on the longitudinal force due to temperature variations, which can reduce the force by 36% after being installed.