连续梁拱组合桥梁吊杆初张力分析  

Initial Tension Analysis of Suspender of Continuous Beam-Arch Combination Bridge

作　　者：庞伟 PANG Wei(CSCEC AECOM Consultants Co.,Ltd,Lanzhou 730000,China)

机构地区：[1]中国市政工程西北设计研究院有限公司,兰州730050

出　　处：《交通科技》2023年第6期38-42,共5页Transportation Science & Technology

摘　　要：连续梁拱组合桥梁主梁和拱肋协同受力,荷载由梁体系和拱体系共同承担。用以确定成桥状态吊杆索力的常用方法对梁拱刚度较接近或主梁刚度较大的梁拱组合桥梁无法得到合理的结果。针对连续梁拱组合桥梁,需要形成确定成桥状态吊杆索力的有效方法并进而得到桥梁施工阶段的吊杆初张力。文中以三跨连续梁拱组合桥梁为工程背景,分析指定梁拱弯矩分配比法在确定连续梁拱组合桥梁吊杆初张力中的实现,同时针对不同边中跨比分析其对吊杆初张力的影响。分析发现,指定梁拱弯矩分配比法确定的桥梁成桥状态吊杆索力可用于桥梁施工阶段的吊杆初张力并具有较好的适应性,可用于常规跨径连续梁拱组合桥梁的吊杆初张力确定。The main beam and arch rib of continuous beam-arch combination bridge are loaded jointly by the beam system and the arch system.The common methods used to determine the cable force of suspenders in the completed bridge state can not get reasonable results for beam-arch combination bridges with close beam-arch stiffness or large main beam stiffness.Aiming at the continuous beam-arch combination bridge,it is necessary to form an effective method to determine the cable force of the suspenders in the completed bridge state and then obtain the initial tension of the suspenders in the bridge construction stage.Taking a three-span continuous beam-arch combination bridge as the engineering background,the implementation of the specified beam-arch moment distribution ratio method in determining the initial tension of the suspender of a continuous beam-arch combination bridge is analyzed,and its effect on the initial tension of the suspender is also analyzed for different side-to-span ratios.It is found that the suspender tension determined by the specified beam-arch moment distribution ratio method can be used for the initial tension of the suspenders in the bridge construction stage with good adaptability,and can be used for the determination of the initial tension of the suspenders of continuous beam-arch combination bridge with conventional span.

关 键 词：连续梁拱组合桥梁 边中跨比 指定梁拱弯矩分配比 吊杆初张力 

分 类 号：U448.22[建筑科学—桥梁与隧道工程] U441[交通运输工程—道路与铁道工程]