主跨468m铁路钢箱混合梁斜拉桥设计  

Design of a Railway Steel and Concrete Hybrid Box Girder Cable-Stayed Bridge with Main Span of 468m

作　　者：刘振标[1] 罗世东[1] 潘茂盛[1] 曾甲华[1] 

机构地区：[1]中铁第四勘察设计院集团有限公司,湖北武汉430063

出　　处：《桥梁建设》2014年第1期81-88,共8页Bridge Construction

基　　金：铁道部科技开发计划重点课题(2009G004-C)~~

摘　　要：宁波铁路枢纽北环线甬江特大桥采用半飘浮结构体系钢箱混合梁斜拉桥,孔跨为(53+50+50+66+468+66+50+50+53)m。钢-混分界点位于主梁中跨距桥塔24.5m处,除中跨419m采用钢箱梁外,其余均采用混凝土箱梁;桥塔采用钻石形混凝土结构,塔高177.91m,上塔柱设内置式钢锚箱;斜拉索采用7mm的镀锌平行钢丝拉索,空间双索面扇形布置;基础采用超长、大直径群桩基础。混凝土梁采用支架逐孔现浇施工,钢箱梁采用节段吊装。设计针对铁路活载大、刚度要求高的特点,确定了合理成桥状态,并进行结构静力分析、抗震及抗风研究、车-桥及风-车-桥耦合振动分析,验证了结构的安全性和舒适性。The Yongjiang River Bridge on the North Ring Link of the Ningbo Railway Termi nal is a steel and concrete hybrid box girder cablestayed bridge of semifloating structural sys tem. The span arrangement of the bridge is （53＋50＋50＋66＋468＋66＋50＋50＋53） m. The cutoff joint of the steel and concrete sections on one side is located in the central span of the main girder, 24.5 m apart from the pylon. With the exception that the 419 m long section of the cen tral span is of the steel box girder, the rest sections of the bridge are all of the concrete box gird ers. The pylons of the bridge, each being 177.91 m in height, are the diamondshape concrete structures. In the upper column of a pylon, the builtin steel anchor box is arranged. The stay cables are made up of the 47 mm galvanized parallel steel wires and are arranged in fanshape in spatial double cable planes. The foundations of the bridge are the ones supported on the very long and large diameter group piles. The concrete box girders are cast in situ on scaffoldings span by span while the steel box girder is lifted and installed in blocks. In the light of the characteristic that the railway load of the bridge is great and the required rigidity is high, the reasonable com pleted bridge state is determined in the design and at the same time, the structural static analysis, the study of the seismic resistance, wind resistance, the analysis of vehiclebridge and windvehi clebridge coupling vibration are carried out and the structural safety and comfort are verified as well.

关 键 词：铁路桥 斜拉桥 混合梁 箱形梁 桥塔 斜拉索 合理成桥状态 桥梁设计 

分 类 号：U448.27[建筑科学—桥梁与隧道工程]