大跨度连续下承式钢箱拱桥设计  

Design of Long-Span Continuous Through Type Steel Box Arch Bridge

作　　者：李国普 李斐然 

机构地区：[1]河南省交通规划设计研究院股份有限公司,河南郑州450052

出　　处：《世界桥梁》2016年第2期12-15,36,共5页World Bridges

基　　金：河南省交通科技重点项目(2011PⅡ07)

摘　　要：为满足桥梁的景观和功能要求,小浪底坝后保护区交通桥上部结构采用(95+152+95)m三跨连续下承式钢箱拱结构。主梁为预应力混凝土π形梁,采用钢管桩+贝雷梁法施工。拱肋为钢箱提篮拱,结构用钢采用Q345D钢板,先工厂预制再现场焊接成型。吊索采用7根Ф15.2环氧喷涂无粘结钢绞线,缠包后热挤HDPE,抗拉强度标准值1 860 MPa。下部结构采用柱式台、倒V形实体薄壁墩、高桩承台、钻孔灌注桩基础。采用非线性程序TDV进行计算分析,结果表明,该桥的强度、刚度和稳定性以及抗震性能均满足规范要求。To meet the landscape and function requirements proposed,the transportation bridge in the conservation area behind the Xiaolangdi Dam adopts a three-span continuous through type steel box arch bridge structure with span arrangement of（95＋152＋95）m.The main girder is the prestressed concreteπ-shaped girder,constructed by the combined use of steel tube piles and bailey truss.The arch ribs are the steel box basket handle arches.The predominant material used for the structure is the Q345 Dsteel plate,and all the components are prefabricated in the factory and transported to the bridge site for welding to take shape.Each hanger consists of 7Ф15.2 epoxy non-binding steel strands,extruded with HDPE after wrapping.The hanger has a standard tensile strength of 1 860 MPa.The substructure of the bridge incorporates column-type abutments,inversed V-shaped solid thin-wall piers,high-rise pile caps and bored piles.The non-linear program TDV was used to do calculation.The results of the calculation demonstrate that the strength,rigidity,reliability and anti-seismic performance of the bridge all meet the code requirements.

关 键 词：提篮拱桥 预应力混凝土结构 π形梁 钢箱拱 吊索 拱脚 基础 桥梁设计 

分 类 号：U442.5[建筑科学—桥梁与隧道工程] U448.22[交通运输工程—道路与铁道工程]