双缆悬索桥体系的力学特性(Ⅰ)  

Mechanical Properties of Double-Cable Suspension Bridge System (Ⅰ)

作　　者：柴生波[1] 肖汝诚[1] 孙斌[1] 

机构地区：[1]同济大学桥梁工程系,上海200092

出　　处：《华南理工大学学报（自然科学版）》2011年第12期159-164,共6页Journal of South China University of Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(51008223)

摘　　要：鉴于双缆体系在多塔悬索桥中的应用前景,研究了双缆悬索桥体系的基本力学特性,主要分析了双缆体系在承受满布均布荷载时,荷载在上缆与下缆间的分配情况,推导了主缆竖向刚度表达式.研究表明,均布荷载在上缆与下缆间的分配比例取决于缆的截面参数及垂跨比,垂跨比越大,承受均布荷载时主缆的竖向刚度越大.由以上关系导出主缆在均布荷载下由缆的伸长引起的加劲梁挠度,分析了双缆体系在半跨加载及受集中力荷载时的变形情况,并建立有限元模型对其进行了验证,结果与理论值吻合良好.This paper deals with the basic mechanical properties of a double-cable suspension bridge system that has wide application prospect in multi-tower suspension bridges.In the investigation,the distribution of uniform loads on the top and the bottom cables are analyzed when the span is fully and uniformly loaded,and the vertical stiffness of the main cable is formulated.The results indicate that the distribution of uniform loads on the top and the bottom cables depends on the section parameters of the cables and the rise-span ratio and that the vertical stiffness of the main cable under uniform loads increases with the rise-span ratio.Based on the above-mentioned findings,the girder deflection resulting from the cable extension is obtained.In addition,the deformations of the discussed double-cable system respectively due to concentrated loads and uniform loads on the half span are analyzed,and the results are verified by using a finite element model,with good accordance being obtained.

关 键 词：双缆悬索桥 力学特性 竖向刚度 挠度 

分 类 号：U488.25[交通运输工程—载运工具运用工程]