摘要
为研究限位吊索对大跨缆索桥梁结构静动力特性的影响,以某非对称三跨连续悬索桥为工程背景,建立了大桥有限元模型,并通过实测验证了模型的正确性,探究了限位吊索对大桥主缆线形、主梁线形及动力特性的影响.研究结果表明:限位吊索可协调三跨连续悬索桥边跨过渡墩处主缆与主梁的竖向变形,使得结构具有合理的应力分布;当一侧不设限位吊索时,主缆最大变形可达355.7 mm,同时引起其余吊索发生应力重分布,使得边跨主梁产生最大正向变形值,并在另一侧边跨产生最大负向变形值;当全桥均不设限位吊索时,主缆与主梁两侧变形均达到最大值,应力重分布呈对称分布;限位吊索主要影响三跨连续悬索桥前3阶竖弯模态频率,设置限位吊索可略微提高结构的竖向刚度.
In order to study the influence of displacement limiting cable on the static and dynamic characteristics of structures,an asymmetric three-span continuous suspension bridge was taken as the engineering background.The finite element model of the bridge was established,and the correctness of the model was verified through actual measurement.The influences of displacement limiting cable on the main cable alignment,main beam alignment and dynamic characteristics of the bridge were investigated.The results show that the displacement limiting cable can coordinate the vertical deformation of the main cable and the main beam at the side span transition pier of the three-span continuous suspension bridge,so that the structure has a reasonable stress distribution.When there is no displacement limiting cable on one side,the maximum deformation of the main cable can reach 355.7 mm.Meanwhile,the stress of other slings is redistributed,resulting in the maximum positive deformation of the side span girder and the maximum negative deformation of the side span on the other side.When the entire bridge is not equipped with displacement limiting cable,the deformation of the main cable and both sides of the main beam reaches the maximum value,and the stress redistribution is symmetrically distributed.The displacement limiting cable mainly affects the first three vertical bending modal frequencies of three-span continuous suspension bridge.The vertical stiffness of the structure can be slightly improved by setting displacement limiting cable.
作者
袁智杰
王浩
茅建校
苏迅
宗海
Yuan Zhijie;Wang Hao;Mao Jianxiao;Su Xun;Zong Hai(Key laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education,Southeast University,Nanjing 211189,China;Nanjing Highway Development(Group)Co.,Ltd.,Nanjing 210031,China)
出处
《东南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2023年第3期395-401,共7页
Journal of Southeast University：Natural Science Edition
基金
国家自然科学基金资助项目(51978155,52108274).
关键词
限位吊索
三跨连续悬索桥
静动力特性
有限元
实测
displacement limiting cable
three-span continuous suspension bridge
static and dynamic characteristics
finite element
actual measurement
作者简介
袁智杰(1995-),男,博士生;联系人:王浩,男,博士,教授,博士生导师,wanghao1980@seu.edu.cn.
