大跨预应力混凝土斜拉桥平转施工阶段主梁受力研究  

Study on Main Girder Stress of Large-span Prestressed Concrete Cable-stayed Bridge in Horizontal Rotation Construction Stage

作　　者：于哲[1] 郑建新[2,3,4,5] 孙南昌 黄甘乐 YU Zhe;ZHENG Jianxin;SUN Nanchang;HUANG Ganle(CCCC Second Highway Consultants Co.,Ltd.,Wuhan,Hubei 430056,China;CCCC Second Harbor Engineering Co.,Ltd.,Wuhan,Hubei 430040,China;Key Laboratory of Large-span Bridge Construction Technology,Wuhan,Hubei 430040,China;Research and Development Center of Transport Industry of Intelligent Manufacturing Technologies of Transport Infrastructurer,Wuhan,Hubei 430040,China;CCCC Highway Bridge National Engineering Research Centre Co.,Ltd.,Beijing 100120,China)

机构地区：[1]中交第二公路勘察设计研究院有限公司,湖北武汉430056 [2]中交第二航务工程局有限公司,湖北武汉430040 [3]长大桥梁建设施工技术交通行业重点实验室,湖北武汉430040 [4]交通运输行业交通基础设施智能制造技术研发中心,湖北武汉430040 [5]中交公路长大桥建设国家工程研究中心有限公司,北京100120

出　　处：《施工技术（中英文）》2021年第23期13-17,40,共6页Construction Technology

基　　金：国家重点研发计划专项资助项目(2017YFC0805304)。

摘　　要：郑万高速铁路跨郑西高速铁路桥梁设计为(32+138+138+32)m预应力混凝土转体斜拉桥,主梁经支架法施工、斜拉索张拉完成后平转至目标位置,施工风险高,控制难度大。针对转体特点,采用有限元实体模型,分析主梁在平转过程中应力分布,分析转动加速度可行的控制范围,并进行了转动速度及主梁应力实时监测。结果表明:在加速转动阶段,靠近塔根处主梁应力变化较大,应力分布呈S形,当转动加速度在0.01m/s^(2)以下时,梁体转动平顺;在匀速转体阶段,主梁应力水平较低,当转速控制在0.02rad/min以下时,几乎无影响;应力监测值与理论值较吻合。三维实时监测平台为施工提供了辅助决策和异常状况预警。The bridge of Zhengzhou-Wanzhou High Speed Railway across Zhengzhou-Xi’an High Speed Railway is designed as(32+138+138+32) m prestressed concrete rotational cable-stayed bridge. The main girder is cast-in-situ support which parallels to the existing line. After the cable is tensioned, it is leveled to the design target position. The risk of the bridge construction is high and the control is difficult. According to its characteristics, through the theoretical and finite element solid model analysis, the stress distribution of the main girder in the process of horizontal rotation is analyzed. The feasible control range of rotational acceleration is analyzed. The rotation speed and main girder stress are monitored in real time. The results show that, in the accelerated rotation stage, the stress of the main girder near the tower root changes greatly, and the stress distribution is in the shape of “S”. When the rotation acceleration is controlled within 0.01 m/s^(2), the rotation of the girder is smooth. In the stage of uniform rotation, when the angular velocity is controlled within 0.02 rad/min, the stress change can be ignored. The stress monitoring values are in good agreement with the theoretical analysis.The 3 D real-time monitoring platform provides auxiliary decision-making and early warning of abnormal conditions for construction.

关 键 词：桥梁工程 斜拉桥 预应力 主梁 平转 施工技术 力学特性 监测 

分 类 号：U448.27[建筑科学—桥梁与隧道工程]