摘要
八大河特大桥主桥为中央索面变高度预应力混凝土部分斜拉桥,跨径布置为(125+230+125)m,采用塔墩梁固结体系。主梁为变高度混凝土单箱三室连续箱梁,采用C55混凝土和纵、横、竖三向预应力体系;桥塔布置在主梁截面中央,采用钢筋混凝土矩形实体截面,桥面以上塔高39 m;桥塔横桥向布置2排斜拉索,每侧设16对,斜拉索采用φ^(s)15.2 mm环氧喷涂钢绞线,标准抗拉强度1860 MPa,梁上锚固点处横向间距为0.9 m,梁上索距4.0 m,塔上索距1.0 m;桥墩采用矩形薄壁结构,墩身高达94.5 m;基础采用钻孔灌注桩群桩。采用MIDAS Civil软件建立该桥整体及局部有限元模型进行静、动力特性分析,结果均满足规范要求。
The main bridge of Badahe Bridge is a prestressed concrete extradosed bridge with a main span of 230 m and two side spans of 125 m.The pylons are fixed with the superstructure and piers.The superstructure consists of variable-depth three-cell box girders of C55 concrete,with prestressing tendons arranged in longitudinal,transverse and vertical directions.The pylons are solid reinforced concrete structures of rectangular cross-section,which are located along the center line of the superstructure and rise 39 m above the deck.The stay cables are composed of φ^(s)15.2 mm epoxy coated steel strands,with nominal tensile strength of 1860 MPa.There are 16 pairs of stay cables that are arranged in parallel planes on each side of a pylon.The two parallel planes are transversely spaced at 0.9 m on the deck,while the longitudinal spacings of stay cable anchor points on the deck are 4.0 m,and the vertical spacings of stay cable anchor points on the pylons are 1.0 m.The piers are rectangular thin-walled structures that are 94.5 m high,supported by bored group pile foundations.The finite element software MIDAS Civil was used to establish the global and local models of the bridge for static and dynamic analysis.The results meet the code requirements.
作者
吴帅峰
高有德
WU Shuai-feng;GAO You-de(China Railway Major Bridge Reconnaissance & Design Institute Co. ,Ltd. ,Wuhan 430050,China;Yunnan Infrastructure Investment Co. ,Ltd. ,Kunming 650501,China)
出处
《世界桥梁》
北大核心
2022年第2期13-19,共7页
World Bridges
关键词
部分斜拉桥
塔墩梁固结
三向预应力体系
薄壁高墩
斜拉索
静动力分析
桥梁设计
extradosed bridge
pylon-superstructure-pier fixation
three-directional prestressing system
thin-walled high-rise pier
stay cable
static and dynamic analysis
bridge design
