公铁两用吊拉组合体系桥结合部参数  

Parameters of Bridge Joints of Public-Rail Dual-purpose Lifting and Pulling System

作　　者：朱旺华 李文武 王会利[1,3] ZHU Wanghua;LI Wenwu;WANG Huili(National&Local Joint Engineering Laboratory of Bridge and Tunnel Technology,Dalian University of Technology,Dalian 116023,China;Hunan Provincial Communications,Planning,Survey&Design Institute Co.,Ltd,Changsha 410200,China;State Key Laboratory of Structural Analysis for Industrial Equipment,Dalian University of Technology,Dalian 116023,China)

机构地区：[1]大连理工大学桥梁与隧道安全技术国家与地方联合实验室,辽宁大连116023 [2]湖南省交通规划勘察设计院有限公司,湖南长沙410200 [3]大连理工大学工业装备结构分析国家重点实验室,辽宁大连116023

出　　处：《沈阳大学学报（自然科学版）》2021年第1期68-74,共7页Journal of Shenyang University：Natural Science

基　　金：辽宁省自然科学基金资助项目(2019-ZD-0006);辽宁省博士科研启动基金资助项目(20170520138).

摘　　要：针对吊拉组合体系桥结合部的吊杆应力幅过大和主梁过渡不平顺等问题,以某主跨为1152 m的公铁两用吊拉组合体系桥设计方案为例,通过分步计算法获得合理成桥状态,并在此基础上分析重叠吊杆数和载荷分配比例2个主要参数对结合部的吊杆应力幅和主梁位移幅影响.结果表明:设置重叠吊杆可以明显降低悬索段端吊杆应力幅,同时还可以使悬索段向斜拉段平顺过渡;重叠吊杆数对结合部重叠区端吊杆应力幅的影响在设计过程应该给予考虑;载荷分配比例取较低值为宜,高载荷分配比例不利于主梁平顺过渡,增设重叠吊杆反而会加剧主梁过渡不平顺这一现象.Aiming at problems such as excessive stress amplitude of the boom at the joint part of the suspension-tension combined system and uneven transition of the main beam,taking a road-rail dual-purpose suspension-tension combined system bridge design scheme with a main span of 1152 m as an example,a reasonable completion state is obtained through a step-by-step calculation method.And on this basis,the influence of two main parameters,the number of overlapping booms and the load distribution ratio,on the stress amplitude of the joints and the displacement amplitude of the main beam is analyzed.The results show that:the setting of overlapping suspenders can significantly reduce the stress amplitude of the hanger rod at the end of the suspension section,and at the same time,it can also make the transition from the suspension section to the cable-stayed section smooth;the influence of the number of overlapped boom on the stress amplitude at the end of the overlapped suspenders should be considered in the design process;the lower value of the load distribution ratio is appropriate.The high load distribution ratio is not conducive to the smooth transition of the main beam.The addition of overlapping booms will aggravate the uneven transition of the main beam.

关 键 词：吊拉组合体系桥 结合部 分步计算法 重叠吊杆 载荷分配比例 应力幅 平顺过渡 

分 类 号：U448.12+1[建筑科学—桥梁与隧道工程]