特大桥连续梁跨中下挠及腹板抗震防裂设计研究  

Research on design of anti-seismic and anti-cracking of continuous beam middle-span deflection and webs of extra large bridge

作　　者：孙佳星 Sun Jiaxing(Pingdingshan Highway Traffic Survey and Design Institute,Pingdingshan 467000,China)

机构地区：[1]平顶山市公路交通勘察设计院,平顶山467000

出　　处：《青海交通科技》2022年第2期90-94,共5页Qinghai Transportation Science and Technology

基　　金：2021河南省科技攻关项目(212102310289)。

摘　　要：本文以黄河特大桥连续梁主跨桥设计为背景,分析了影响跨中下挠、腹板开裂的设计措施。黄河特大桥采用预应力混凝土连续桥梁,通过梁体受力、收缩徐变理论及相关参数进行设计,控制好纵向预应力束、底板挖空率,采用高强预应力粗钢筋,布置整体锚垫板,设置斜预应力筋和梁底板钢骨架等,能有效控制跨中下挠和腹板开裂,同时应做好施工控制。This paper analyzes the design measures that affect the mid-span deflection and web cracking based on the design of the main span of the continuous girder of the Yellow River Bridge.The Yellow River Super Bridge adopts a prestressed concrete continuous bridge,which is designed based on the beam force,shrinkage and creep theory and related parameters.It is believed that the longitudinal prestressed beams and the hollowing rate of the bottom plate are well controlled.The high-strength prestressed thick steel bars are used and the overall anchor pads are arranged.The slab,the installation of oblique pre-stressed tendons and the steel frame of the beam bottom plate,etc.,can effectively control the mid-span deflection and web cracking.At the same time,construction control and maintenance must be done.

关 键 词：黄河特大桥 连续梁 跨中下挠 腹板开裂 抗震防裂 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]