混合梁斜拉桥钢轨扣件和伸缩调节器合理布置

Reasonable Arrangement of Rail Fastener and Telescopic Adjustment on Hybrid Girder Cable-stayed Bridge

以某货运专线大跨度箱型主梁混合梁斜拉桥建设为工程背景,建立了桥上长钢轨与桥梁结构系统纵向相互作用空间分析模型,系统计算分析了桥上钢轨扣件型式和伸缩调节器布置对轨-桥系统纵向相互作用的影响,提出了钢轨扣件和伸缩调节器合理布置方案。研究结果表明,桥上铺设小阻力扣件可使钢轨制动力幅值略有减小,伸缩附加力最大值明显减小,挠曲力幅值有所减小,在主桥两端设置钢轨伸缩调节器对降低轨-桥系统纵向相互作用力效果最佳。

Based on the construction of large-span freight railway box hybrid girder cable-stayed bridge,the spatial analysis model of the interaction between continuous welded rail and bridge structure is established.The effect of rail fastener type and telescopic adjustment arrangement on longitudinal interaction of the rail-bridge system is analysed systematically.The reasonable layout program of fastening and telescopic adjustment is put forward.The results of the study indicates that the magnitude of the rail braking force can be slightly reduced,rail stretching force be significantly decreased,and rail flexural force be cut down when small resistance fasteners is layed on the bridge.The longitudinal interactions of track-bridge system is lowered furthest when rail telescopic adjuster is set at both ends of the main bridge.