摘要
为分析高速铁路大跨度连续钢桁梁拱桥上无缝线路纵向力变化规律,建立了考虑钢桁梁、吊杆、拱肋以及相邻桥跨结构的大跨度连续钢桁梁拱桥与轨道相互作用模型,研究了温度、竖向荷载作用下大跨度连续钢桁梁拱桥无缝线路纵向力的分布规律。研究表明:(1)温度荷载作用下,钢轨伸缩附加力主要由钢桁梁温度变化引起,拱肋和吊杆温降对系统纵向受力和位移影响较小,连续钢桁梁拱桥两端设置伸缩调节器能够有效降低梁端钢轨纵向温度附加力和桥墩纵向力;(2)竖向荷载作用下,钢轨挠曲附加力小于伸缩附加力,钢轨会产生较大的竖向位移,但不影响设计;(3)在跨度小于220m的连续钢桁梁拱桥上无缝线路设计时可忽略拱肋和吊杆对伸缩附加力的影响,可直接依据钢桁梁引起的伸缩附加力进行设计。
In order to analyze the variation law of longitudinal force of seamless lines on long-span continuous steel truss girder arch bridges of high-speed railways, a long-span continuous steel truss girder arch bridge with steel trusses, hangers, arch ribs and adjacent bridge span structures was established The track interaction model is used to study the longitudinal force distribution law of the long-span continuous steel truss girder arch bridge seamless line under the action of temperature and vertical load. The research shows that:(1) Under the action of temperature load, the additional force of rail expansion and contraction is mainly caused by the temperature change of steel truss girder,and the temperature drop of arch rib and hanger has little effect on the longitudinal force and displacement of the system. The telescopic adjuster can effectively reduce the longitudinal temperature additional force of the beam end rail and the longitudinal force of the bridge pier.(2) Under the action of vertical load, the additional force of deflection of the rail is less than the additional force of expansion and contraction,and the rail will produce a large vertical displacement, but the design is not controlled.(3) In the design of seamless lines on continuous steel truss girder arch bridges with a span of less than 220m, the influence of arch ribs and hangers on the expansion and contraction additional force can be ignored, and the design can be directly based on the expansion and contraction additional force caused by the steel truss girder.
作者
孔月
吴志刚
楚金辉
Kong Yue;Wu Zhigang;Chu Jinhui(China Railway Kunming Bureau Group Co.Ltd.,Kunming South Engineering Section,Kunming,Yunnan 650000;China Railway Research Institute Group Co.Ltd.,Railway Construction Research Institute,Beijing 100081)
出处
《江西建材》
2022年第6期275-278,共4页
Jiangxi Building Materials
关键词
连续钢桁梁拱桥
大跨度
无缝线路
纵向力
Continuous steel truss arch bridge
Long span
Seamless line
Longitudinal force
