福鼎八尺门大桥主桥设计

摘要

T he main bridge of Fuding Bachimen Bridge is a single‐pylon hybrid girder cable‐stayed bridge with span arrangement of (33+67+200) m .The stay cables are arranged in single cable plane .T he bridge ,w hich adopts a pylon‐pier‐girder fixity system ,has a sail‐shaped concrete pylon with a 103 .6 m high column as well as an ornament pylon of steel‐concrete hybrid structure . To improve the wind resistant performance of the bridge ,the main girder adopts the stream‐lined box cross section ,among w hich the part in the main span is steel girder and the side span the con‐crete girder .The steel‐concrete joint section between the concrete and the steel box girders is 2 m long .Counterweights are placed in the concrete box girder of the side span . The stay cables formed of φs15 .2 mm epoxy coated steel strands are laid out in a fan cable plane .The tools of MI‐DAS and ANSYS were used to do calculation and analysis .The results indicate that the static and dynamic behaviors of the bridge meet the code requirements .%福鼎市八尺门大桥主桥为（33＋67＋200） m 独塔单索面混合梁斜拉桥，采用塔墩梁固结体系；塔柱高103．6 m ，桥塔呈“风帆”造型，采用混凝土结构，装饰塔采用混凝土和钢结构。为提高抗风性能，主梁采用流线型箱梁断面，主跨侧主梁采用钢梁，边跨侧主梁采用混凝土梁，混凝土箱梁和钢箱梁之间通过2 m 钢混结合段连接，边跨混凝土箱梁设置配重。斜拉索布置为扇形，采用矱s 15．2 mm 环氧涂层钢绞线。采用有限元软件MIDAS 及ANSYS 对该桥进行计算分析，结果表明该桥的静力、动力特性均满足规范要求。