济阳黄河公铁两用特大桥主桥设计关键技术  

Key Design Techniques of Main Bridge of Jiyang Huanghe River Rail-cum-Road Bridge

作　　者：孙宗磊 冯亚成[2] 张小坤[2] SUN Zonglei;FENG Yacheng;ZHANG Xiaokun(China Railway Economic and Planning Research Institute,Beijing 100038,China;China Railway First Survey and Design Institute Group Co.,Ltd.,Xi′an 710043,China)

机构地区：[1]中国铁路经济规划研究院有限公司,北京100038 [2]中铁第一勘察设计院集团有限公司,陕西西安710043

出　　处：《桥梁建设》2024年第4期119-125,共7页Bridge Construction

基　　金：山东省交通运输厅科技计划项目(2022B90,2022B91);中铁第一勘察设计院集团有限公司科学技术研究与开发项目(2021KY60YB-14,2022KY33YB-03)。

摘　　要：济阳黄河公铁两用特大桥主桥为四塔三主跨、非对称矮塔钢桁梁斜拉桥,孔跨布置为(84+144+228+240+300+120+60)m。桥塔采用扁钢箱形桥塔,主墩采用矩形截面实心门式墩,主墩基础采用直径2 m钻孔灌注桩,主梁采用双层板桁结合的钢桁梁。通过结构体系比选,主桥采用塔梁固结、塔墩分离的结构体系,可显著降低长联钢结构温度效应。主梁采用超宽双主桁直桁及铁路桥面非行车道区域镂空设计,构造简洁且能很好地与结构体系相适应。铁路桥面系顶板采用不锈钢复合板,提高了耐久性和经济性;公路桥面采用压重设计,解决了负反力问题。该桥桥塔采用了融入齐鲁文化的“齐鲁之魂”造型,使结构更好地融入周围环境。主梁节段模型和全桥气弹模型风洞试验表明,主梁的颤振性能、涡振性能及静风稳定性均满足抗风安全需求。通过阻尼器斜置的减隔震设计方案,解决了桥梁顺桥向及横桥向2个方向的抗震难题。应用钢结构桥梁参数化建模、智慧建造及健康监测技术,保障桥梁结构安全。The main bridge of Jiyang Huanghe River Rail-cum-Road Bridge is a four-pylon asymmetric extradosed bridge with seven spans of 84,144,228,240,300,120 and 60 m.The pylons are steel structures of flat box cross-section,mounted on piers that are portal-frame piers with solid rectangular cross-section,supported by bored piles of 2 m diameter.The superstructure consists of two planes of vertical steel trusses that act compositely with the upper concrete deck panels and the lower stainless steel composite plates,accommodating road and rail traffic,respectively.The pylons are fixed with the superstructure,while connected to the piers via bearings,to notably reduce the thermal effect of the bridge structure with long expansion units.The transverse distance between the two planes of vertical trusses is large,the non-vehicle zones in the rail deck adopt latticed design to simplify the structure and match aesthetics of the bridge structural system.The top plates of the rail deck are the stainless-steel composite plates for the consideration of durability and economy.The road deck is counterweighted to combat negative reaction forces.Inspired by the essence of the Qilu culture,the appearance of the pylons is a good match of the surroundings.The wind tunnel tests on the sectional model and aeroelastic model demonstrate that the flutter performance,vortex-induced vibrations and static wind stability of the superstructure could meet the wind resistance requirements.To effectively dissipate seismic energy in both the longitudinal and transverse directions,the dampers are installed with an inclination.To ensure the safety of the bridge,the technologies of parametric modelling of steel structure,intelligent construction and structural health monitoring were applied.

关 键 词：公路铁路两用桥 矮塔斜拉桥 结构体系 钢桁梁 桥塔造型 抗风性能 减隔震技术 桥梁设计 

分 类 号：U448.121[建筑科学—桥梁与隧道工程] U448.27[交通运输工程—道路与铁道工程] U442.5