多线铁路拱加劲连续梁桥上无缝线路梁格模型

以新建铁路成都至兰州线上某(36+112+36)m双线拱加劲连续梁桥为背景,采用理想弹塑性道床阻力模型,建立轨-梁-墩一体化的传统平面模型和空间梁格模型,对比分析2种计算模型中拱加劲连续梁桥上钢轨纵向附加力的分布规律.研究表明:梁格模型与平面模型计算所得的线路纵向力变化规律基本一致,但平面模型的计算结果偏于保守;平面模型无法准确反映不对称加载时多线轨道的空间受力特性;对于大跨度多线铁路桥而言,宜采用空间梁格模型对其上无缝线路进行检算.

Grillage Models of CWR on Continuous Beam-arch Composite Railway Bridges with Multi-track

A traditional rail-beam-pier plane model and a rail-beam-pier grillage model were built by adopting the mechanism of ideal elastic-plastic ballast resistance with the background of a (36+112+36) m double-track continuous beam-arch composite bridge on the new Chengdu-Lanzhou Railway line. The aim was to study the difference between grillage models and plane models about the distribution of longitudinal forces in continuous beam-arch composite bridges. The results show that the distribution of longitudinal forces is basically the same in the grillage models and plane models, but the results of the plane models are conservative. Plane models can not accurately reflect the spatial mechanical properties with multi-track under asymmetric loads. Therefore, the grillage model is more effective in the calculation of CWR(continuously welded rail) on the multi-track long span railway bridge.