佛山东平水道公轨两用斜拉桥结构设计及关键技术研究

Research on Structural Design and Key Technology of Foshan Dongping Waterway Rail-cum-Road Cable-Stayed Bridge

佛山东平水道桥为主跨260 m公轨两用独塔斜拉桥,主桥范围内轨道交通和公路同层布置,桥面布置为双线轨道交通+六车道公路+两侧人行道,桥面总宽46.5 m。主梁采用等高度钢-混凝土混合主梁,主塔采用“A”形,为墩-塔-梁固结体系。对该桥结构形式、设计关键技术和动力性能进行研究,建立斜拉桥整体和局部有限元模型,通过理论分析方法对斜拉桥结构和力学行为进行研究,重点进行全桥静力计算、竖向刚度限值研究、钢桥面板受力分析和剪力滞系数分析。开展节段和全桥模型风洞试验,对该桥进行风-车-线-桥耦合振动分析,保证车辆运行平稳性良好。研究结果表明,该桥刚度、强度、稳定和舒适性均满足规范要求。

Foshan Dongping waterway bridge is a rail-cum-road single-pylon cable-stayed bridge with a main span of 260 m.The urban rail transit and highway are arranged on the same floor within the main bridge.The bridge deck is arranged in a pattern of 2-lane rail transit+6-lane highway+sidewalks on both sides,and the total width of the bridge deck is 46.5 m.The main beam adopts the same height steel-concrete mixed main beam,and the main tower follows “A” shape,which is a pier-tower-beam consolidation system.The structural form,key design technology and dynamic performance of the bridge are studied.The whole and local finite element models of cable-stayed bridge are established,and the structure and mechanical behavior of cable-stayed bridge are studied with theoretical analysis method,with emphasis on the static calculation of the whole bridge,the research of the limit value of vertical stiffness,the stress analysis of steel bridge deck and the analysis of shear lag coefficient.The wind tunnel tests of segmented-vehicle and full-bridge models are carried out to analyze the coupling vibration of the bridge so as to ensure the smooth running of vehicles.The research results show that the stiffness,strength,stability and comfort of the bridge meet the requirements of specifications.