摘要
研究目的:太原至中卫至银川铁路全长近千公里,桥梁设计时速200 km,沿线地形、地质情况复杂。太中正线在宁夏自治区中宁县市跨越黄河,位于八度震区(地震动峰值加速度值为0.20g),同时为满足通航及黄河水利委员会对桥梁跨度的相关要求,必须采用大跨结构。为此,确定适合的桥跨形式成为设计中的控制因素。本文根据桥位处自然情况,结合外部要求,并以地震力分析为重点,开展中宁黄河特大桥主桥桥式方案研究。研究结论:通过对预应力混凝土长联连续梁和多跨简支钢桁梁桥式方案比较,得出:(1)钢桁梁地震作用小,符合结构体形简单、受力明确、自重轻、刚度和质量匀称、重心低的抗震设计原则;(2)钢桁梁便于抢修,跨越重要河流时具有较重要的军事意义;(3)钢桁梁温度跨度较小,避免了设置轨道温度调节器对行车舒适性的影响;(4)本文可以为高度震区大跨度桥梁的桥式方案选择提供一定的理论依据,对其他铁路桥梁的桥型选用具有一定参考意义。
Research purposes： Taiyuan - Zhongwei- Yinchuan Railway is nearly 1 000 km with complex topographic and geological conditions. Bridge design speed is 200 km/h. Railway bridges across Yellow River in Zhongning County. Bridges are in octave seismic zone （peak ground acceleration 0.20g）. In order to satisfy navigation requirement and span requirements of the Yellow River Conservancy Commission, large span structure should be used. Accordingly, the most important problem becomes to select suitable bridge type in these bridge design. According to the natural condition of bridge site and external requirements, bridge type study on Zhongning Yellow River Super Major Bridge is carried out in this paper with emphasis on analysis of seismic force. Research conclusions：Through the long- unit prestressed concrete continuous beam and multi -span simply supported steel truss girder bridge type comparison, concluded that： （1）Steel truss girder meet a simple shape, force clear, light weight, stiffness and mass symmetry, the center of gravity low seismic design principles; （2） Steel truss girder to facilitate repairs, across major rivers, have a more important military significance ; （3） Steel truss girder has a smaller temperature span, do not set the track temperature regulator, to avoid the adverse effects of passenger ride comfort; （4） This article can be a highly seismic region large span bridges bridge type choose to provide a theoretical basis, for other railway bridges style selection has a certain reference significance.
出处
《铁道工程学报》
EI
北大核心
2013年第12期36-40,共5页
Journal of Railway Engineering Society
关键词
太中银铁路
中宁黄河特大桥
桥式方案研究
Taiyuan -Zhongwei -Yinchuan Railway
Zhongning Yellow River super major bridge
bridge type study
