不对称分离式斜拉桥边跨施工少钢管支架力学性能分析  

Analysis of Mechanical Properties of Less Steel Pipe Support for Side Span Construction of Asymmetrical Separated Cable-stayed Bridge

作　　者：刘宁波[1] 周清忘 丁子贤 LIU Ningbo;ZHOU Qingwang;DING Zixian(CCCC Second Harbor Engineering Co.,Ltd.,Wuhan,Hubei 430014,China)

机构地区：[1]中交第二航务工程局有限公司,湖北武汉430014

出　　处：《施工技术(中英文)》2024年第24期56-60,90,共6页Construction Technology

基　　金：中交二航局2021年科研课题项目:生态敏感区高速公路建造关键技术研究(EHYF-2021-B-26-128)。

摘　　要：渑淅高速公路小三峡特大桥为分离式混合梁斜拉桥,边跨混凝土箱梁段采用少钢管支架施工。支架高度大、大跨长联、重载,且受到预应力及斜拉索张拉影响。为研究预应力张拉对边跨支架的影响,通过建立有限元模型对少钢管支架力学性能进行分析,得出预应力张拉或斜拉索张拉会造成支架内力重分配,预应力张拉使得与墩柱相邻的钢管应力增加,其余钢管应力减小,斜拉索张拉会使得横桥向两侧的钢立柱应力下降,纵桥向主梁张拉位置附近的钢立柱应力大幅度下降。The Small Three Gorges Bridge of Mianchi-Xichuan Expressway is a separated mixed-beam cable-stayed bridge,and its side span concrete box girder sections are constructed with less steel pipe supports.The support is of large height,long span and heavy load,and is affected by prestress and cable tension.In order to study the influence of prestressed tension on the side span support,a finite element model was established to analyze the mechanical properties of the support with few steel pipe supports.It was concluded that prestressed tension or cable tension would cause the redistribution of the internal force of the support.Prestressed tension increased the stress of the steel pipe adjacent to the pier column,while the stress of the other steel pipes decreased.The stress of the steel column near the tensile position of the main girder of the longitudinal bridge decreases significantly.

关 键 词：桥梁工程 斜拉桥 预应力 支架 有限元分析 力学性能 

分 类 号：U445[建筑科学—桥梁与隧道工程]