研究目的:千米级铁路悬索桥主跨长度超过所在线路开行列车最大编组长度后,全桥布满列车荷载的加载方式与桥梁服役期间实际承受的列车荷载不符,应对此类桥梁列车荷载合理加载长度进行研究。本文以某在建铁路悬索桥为研究对象,采用有限元方法计算各主要构件内力与位移影响线,结合实际列车长度研究列车荷载加载长度对各构件受力特征的影响。
研究结论:(1)主缆、吊杆、主塔的内力与位移影响线在主跨范围内全为正或负,主桁架、平联内力影响线与加劲梁位移影响线的正值段长度约为主跨长度的一半,横联与桥面系的内力影响线数值在其附近约五个节间范围内出现峰值;(2)随着列车荷载加载长度的增大,各构件内力与位移的增大幅度逐渐减小;(3)综合考虑实际列车长度及各构件受力特征随加载长度的变化规律,建议该悬索桥列车荷载加载长度取为550 m;(4)本研究成果可为千米级悬索桥的理论研究和工程设计提供参考。
Abstract
Research purposes:When the main span length of kilometer level railway suspension bridge exceeds the maximum train formation length of the railway line, it is necessary to study the reasonable train loading length because the loading mode of the full bridge loaded by train load is not conformity with the actual train load during the service period of the bridge. A railway suspension bridge under construction is taken as the research object, the influence lines of internal force and displacement of the main components are calculated by finite element method. Based on the actual train length, the influence of train loading length on the force characteristics of each component is studied.
Research conclusions:(1) The internal force and displacement influence lines of main cables, suspender and main towers are all positive or negative within the range of main span; The positive length of main truss and lateral bracing internal force influence line and the positive length of the stiffness beam displacement influence line are about half of the length of the main span; The internal force influence line values of sway bracing and bridge decking have peaks in about five inter-section ranges near them. (2) With the increase of the loading length of the train, the increase range of internal forces and displacements of members decreases gradually. (3) Considering the actual train length and the variation rule of stress characteristics of members with the loading length, it is suggested that the train load loading length of suspension bridges should be 550 m. (4) The research results can provide guidance for theoretical research and engineering design of kilometer level suspension bridge.
关键词
桥梁工程 /
悬索桥 /
千米级 /
列车荷载 /
加载长度 /
影响线
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Key words
bridge engineering /
suspension bridge /
kilometer level /
train load /
loading length /
influence line
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中图分类号：
U24
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