【摘要】 曹妃甸工业区1号桥位于北方寒冷强震区,由通航孔桥、非通航孔桥及引桥组成,综述该桥通航孔桥设计。根据建设条件及景观要求,通航孔桥为跨径2×138 m独塔单索面斜拉桥;桥塔为独柱形,造型为船帆式;索塔锚固区采用外露式钢锚箱方案;主梁采用单箱三室钢-混凝土箱形结合梁;斜拉索采用7 mm镀锌平行钢丝;桥塔墩采用群桩基础。抗震性能研究表明,强震区大型独塔斜拉桥应尽量避免采用塔、梁、墩固结体系,以减小桥梁结构的地震响应。更多还原

【Abstract】 The Caofeidian Industry Zone Bridge No.1 is composed of navigable span bridge,non-navigable span bridges and approach bridges and is located in the cold and strong earthquake region in the northern part of China.A summarized account of the design of the navigable span bridge of the bridge is presented herewith.In accordance with the construction conditions and landscape requirements,the navigable span bridge is designed as a single pylon and single cable plane cable-stayed bridge with span arrangement 2×138 m,the pylon is the column pylon in shape of boat sail.The anchorage zone in the pylon is the steel anchor box exposed outside the pylon.The main girder is the steel and concrete composite girder having three cells and a single box.The stay cables are made up of 7 mm galvanized parallel steel wires and the foundation of the pylon pier is the group pile foundation.The research of seismic resistance of the bridge show that for a major single pylon cable-stayed bridge located in the strong earthquake region,the rigid fixity system of pylon,girder and pier should be possibly avoided in order to reduce seismic response of the bridge structure.更多还原