悬臂施工不平衡段时配重措施对于连续梁桥线形和应力的影响  

Effect of Counterweight Measures on the Alignment and Stress of Continuous Girder Bridges During Cantilever Construction

作　　者：李金垒 李子奇[1] LI Jin-lei LI Zi-qi(School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou 730070, Chin)

机构地区：[1]兰州交通大学土木工程学院,甘肃兰州730070

出　　处：《兰州工业学院学报》2017年第5期27-30,共4页Journal of Lanzhou Institute of Technology

摘　　要：以某铁路预应力混凝土连续梁桥为研究对象,研究了悬臂施工边跨不平衡段时中跨配重措施对连续梁应力和线形的影响以及考察二期恒载铺装后全桥的累计变形状态.结果表明:重点控制关键截面顶底板的拉压应力满足混凝土强度要求,配重措施有利于减小梁体的最大应力和挠度,保证施工安全.Taking a railway prestressed concrete continuous beam bridge as the research object,this paper studies the influence of the cross-counterweight measures on the stress and alignment of the continuous beam during the construction of the cross section of the cantilever construction,and the accumulative deformation of the whole bridge after the second stage load pavement is investigated.The results show that the tensile stress of the top and bottom plate of the key section is controlled to meet the requirement of the concrete strength,the counterweight measures can reduce the maximum stress and deflection of the beam body and ensure the safety of construction.

关 键 词：不平衡段 二期恒载 应力 挠度 配重 

分 类 号：U445.466[建筑科学—桥梁与隧道工程]