新洋港单塔斜拉桥U肋组合箱梁剪切受力特性研究  

Study on Shear Stress Characteristics of U-Ribbed Multi Chamber Composite Box Girder of Xinyang Port Single Tower Cable-Stayed Bridge

作　　者：周宝春 ZHOU Baochun(China Railway 19th Bureau Group No.6 Engineering Co.Ltd.,Wuxi Jiangsu 214028,China;Jiangsu Research Center for Green Smart Manufacturing and Construction Engineering Technology of Fabricated Buildings,Wuxi Jiangsu 214028,China)

机构地区：[1]中铁十九局集团第六工程有限公司,江苏无锡214028 [2]江苏省装配式建筑绿色智慧制造及施工工程技术研究中心,江苏无锡214028

出　　处：《铁道建筑技术》2023年第2期119-122,共4页Railway Construction Technology

基　　金：中铁十九局集团公司科技研究开发项目(22-B06)。

摘　　要：本文以盐城先锋岛单塔斜拉桥U肋多室组合箱梁为背景,采用数值模拟分析及现场监测相结合的手段,研究施工期间单塔斜拉桥U肋多室组合箱梁剪切应力分布及变形特性。结果表明:U肋多室组合箱梁挠度模拟值与实测值吻合度良好;斜拉桥索具张拉会导致箱梁挠度及剪应力显著增加;U肋多室组合箱梁肋板剪应力分布与工程进度密切相关,在张拉阶段产生的较高剪应力会在后续邻近梁段装配阶段重新分布,并逐步趋于稳定。The shear stress distribution and deformation characteristics of the U-ribbed multi chamber composite box girder of a single tower cable-stayed bridge during construction were studied by using numerical simulation modeling and field on-site monitoring during construction,taking the U-ribbed multi chamber composite box girder of a single tower cable-stayed bridge in Xianfeng Island,Yancheng as the background.It is concluded that the deflection of U-ribbed multi chamber composite box girder is in good agreement with the measured value;the tension of the cable-stayed bridge will obviously increase the deflection and shear stress of the box girder;the shear stress distribution of U-ribbed multi chamber composite box girder is closely related to the construction progress,and the higher shear stress generated in the tension stage will be redistributed in the subsequent assembly stage of the adjacent beam section and gradually become stable.

关 键 词：单塔斜拉桥 U肋板 箱型梁 剪切应力 数值分析 现场监测 

分 类 号：U448.27[建筑科学—桥梁与隧道工程] U441.5[交通运输工程—道路与铁道工程]