基于多尺度数值模型的多塔悬索桥关键受力行为研究  

Research on the Key Force Behavior of Multi-tower Suspension Bridges Based on Multi-scale Numerical Model

作　　者：陈小双 王路 王涛[1] 张兴标 邹旭伟 CHEN Xiaoshuang;WANG Lu;WANG Tao;ZHANG Xingbiao;ZOU Xuwei(School of Civil Engineering and Architecture,Southwest University of Science and Technology,Mianyang 621010,Sichuan,China)

机构地区：[1]西南科技大学土木工程与建筑学院,四川绵阳621010

出　　处：《西南科技大学学报》2025年第1期45-52,共8页Journal of Southwest University of Science and Technology

基　　金：国家自然科学基金(52208209);四川省科技计划项目(2023NSFSC0891);广东省基础与应用基础研究基金(2020A1515110240);西南科技大学博士基金(22zx7122)。

摘　　要：多塔悬索桥因“中塔效应”致其在单主跨荷载下结构受力行为复杂。以泰州长江公路大桥为典型案例,构建了考虑中塔处主缆-鞍座局部精细模拟的多尺度有限元模型,分析了单主跨满布汽车荷载作用下的结构与变形特征,并进行了中塔刚度、摩擦系数等关键参数的影响分析,讨论了主缆抗滑设计的合理参数组合。研究表明:多尺度模型是分析与应对多塔悬索桥“中塔效应”问题的有效途径;中塔刚度和名义摩擦系数是影响多塔悬索桥受力行为的主要因素;建议多塔悬索桥设计中采取适当的鞍座抗滑措施,名义摩擦系数可取0.25~0.30,此时中塔刚度可增至20~50 MN/m(泰州桥中塔刚度的3~8倍),从而大幅拓展多塔悬索桥的中塔设计空间,推动该类桥梁的推广与应用。The multi-tower suspension bridge exhibits complex structural stress behavior under a single main span load due to the“mid-tower effect”.Taking the Taizhou Yangtze River Highway Bridge as a typical case,a multi-scale finite element model considering the local detailed simulation of the main cable-saddle at the middle tower was constructed.The structural and deformation characteristics under the action of a single main span full-coverage automobile load were analyzed.And the influence analysis of key parameters such as the middle tower stiffness and friction coefficient was conducted,and the reasonable parameter combination for the main cable’s anti-slip design was discussed.The research shows that the multi-scale model is an effective way to analyze and address the“mid-tower effect”problem of multi-tower suspension bridges;The middle tower stiffness and the nominal friction coefficient are the main factors affecting the force behavior of multi-tower suspension bridges;It is suggested that in the design of multi-tower suspension bridges,by taking appropriate saddle anti-slip measures,the nominal friction coefficient can be taken to 0.25-0.30.At this time,the middle tower stiffness can be increased to 20-50 MN/m(3-8 times the middle tower stiffness of the Taizhou Bridge),greatly expanding the design space of the middle tower of multi-tower suspension bridges and promoting the rational application and promotion of such bridges.

关 键 词：多塔悬索桥 中塔效应 抗滑设计 多尺度模型 

分 类 号：U448.25[建筑科学—桥梁与隧道工程]