Influence study of main cable displacement-controlled device type of long-span suspension bridges on structural mechanical properties  

大跨悬索桥主缆限位装置形式对结构力学性能的影响研究

作　　者：YUAN Zhijie WANG Hao MAO Jianxiao LI Rou ZONG Hai 袁智杰;王浩;茅建校;李柔;宗海(东南大学混凝土及预应力混凝土结构教育部重点实验室,南京211189;Laboratorio di Meccanica della Frattura,Politecnico di Torino,Torino 10129,Italy;南京公路发展(集团)有限公司,南京210031)

机构地区：[1]Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education,Southeast University,Nanjing 211189,China [2]Laboratorio di Meccanica della Frattura,Politecnico di Torino,Torino 10129,Italy [3]Nanjing Highway Development(Group)Co.,Ltd.,Nanjing 210031,China

出　　处：《Journal of Southeast University(English Edition)》2025年第1期27-36,共10页东南大学学报(英文版)

基　　金：The National Natural Science Foundation of China(No.52338011);the Postgraduate Research&Practice Innovation Program of Jiangsu Province(No.SJCX23_0067).

摘　　要：Main cable displacement-controlled devices(DCDs)are key components for coordinating the vertical deformation of the main cable and main girder in the side span of continuous suspension bridges.To reveal the mechanical action mechanisms of DCD on bridge structures,a three-span continuous suspension bridge was taken as the engineering background in this study.The influence of different forms of DCD on the internal force and displacement of the components in the side span of the bridge and the structural dynamic characteristics were explored through numerical simulations.The results showed that the lack of DCD caused the main cable and main girder to have large vertical displacements.The stresses of other components were redistributed,and the safety factor of the suspenders at the side span was greatly reduced.The setting of DCD improved the vertical stiffness of the structure.The rigid DCD had larger internal forces,but its control effect on the internal forces at the side span was slightly better than that of the flexible DCD.Both forms of DCD effectively coordinated the deformation of the main cable and main girder and the stress distribution of components in the side span area.The choice of DCD form depends on the topographic factors of bridge sites and the design requirements of related components at the side span.主缆限位装置是协调连续体系悬索桥边跨主缆与主梁竖向变形的关键构件。为揭示限位装置对桥梁结构的力学作用机理,以某三跨连续悬索桥为工程背景,通过数值模拟探究了不同形式的限位装置对大桥边跨区域主缆线形、主梁线形、构件内力及结构动力特性的影响。研究结果表明,不设限位装置时,边跨处的主缆与主梁将产生较大的竖向位移,同时引起其余吊索发生应力重分布,极大降低了边跨处吊索的安全系数。设置限位装置在一定程度上可以提高结构的竖向刚度。刚性限位装置自身内力较大,但对于边跨主梁内力的整体控制效果稍好于柔性限位装置。不同形式的限位装置均可有效协调边跨区域缆梁变形及应力的分布。限位装置的形式取决于桥址区地形因素及边跨相关构件的设计要求。

关 键 词：long-span suspension bridge displacement-controlled device static and dynamic characteristics finite element live load 

分 类 号：U448.27[建筑科学—桥梁与隧道工程]