摘要
柳州白沙大桥主桥为主跨2×200m的单塔双索面斜拉桥,刚构体系。主梁采用正交异性钢桥面板流线型扁平钢箱梁,梁高4m、宽38m。桥塔采用钢结构空间Q形塔,塔高108m,为反对称结构。桥塔塔底通过剪力钉和PBL剪力键与混凝土塔座及承台锚固。全桥共布置60根斜拉索,按空间双索面布置,梁上索距12m、塔上索距3m。斜拉索锚固,塔端采用钢锚箱方式,梁端采用锚拉板方式。边墩采用花瓶形框架式桥墩,桥塔墩与边墩均采用分离式矩形承台、钻孔灌注桩基础。为控制成桥线形,并保证施工期间的通航,该桥主梁采用顶推法架设。采用空间有限元程序MIDAS Civil对该桥进行结构静力计算,计算结果显现出成桥阶段主梁横弯、运营阶段主梁刚度偏小的反对称结构受力特性。
The main bridge of the Baisha Bridge in Liuzhou is a cable-stayed bridge of a kind of rigid-frame system with the single pylon,double cable planes and with the main spans of 2×200 m.The main girder of the bridge is the streamlined flat steel box girder having the orthotropic steel deck,the depth of the girder is 4 mand the width is 38 m.The pylon is the spatial Q-shape steel pylon having a height of 108 mand is an antisymmetric structure.At the footing of the pylon,the pylon is anchored with the concrete pylon base and pile caps,respectively using the shear studs and PBL shear connectors.On the whole bridge of the bridge,totally 60 stay cables are provided and the cables are arranged in the spatial double cable planes.The spacing distances between the cables at the deck are 12 mwhile on the pylon,are 3 m.For anchoring of the cables,the cables on the pylon are anchored,using the steel anchor boxes while at the deck,are anchored,using the tensile anchor plates.The side piers of the bridge are the flower vase shape frame piers and the foundations for both the pylon pier and side piers are the bored piles topped with the separated rectangular pile caps.To control the alignment of the completed bridge and ensure the navigation under the bridge in the construction,the main girder is designed to be erected,using the incremental launching method.The space finite element program MIDAS Civil is used to calculate the structural static force of the bridge and the results of the calculation demonstrate the mechanical characteristics of the antisymmetric structure that the main girder at the completed bridge stage bends transversely and the rigidity of the girder at the operation stage tends to be little.
作者
何奇钦
王碧波
HE Qi-qin;WANG Bi-bo(Liuzhou Urban Investment and Construction Co.,Ltd.,Liuzhou 545000,China;China Railway Major Bridge Reconnaissance ＆ Design Institute Co.,Ltd.,Wuhan 430056,China)
出处
《桥梁建设》
EI
CSCD
北大核心
2018年第4期96-101,共6页
Bridge Construction
关键词
斜拉桥
刚构体系
钢箱梁
空间Q形塔
反对称结构
顶推施工
桥梁设计
cable stayed bridge
rigid frame system
steel box girder
spatial Q -shape pylon
antisymmetric structure
incremental launching construction
bridge design
