Flutter Characteristics of Long-span Stress-ribbon Bridges

被引：0
作者：
Hua X.-G. [1 ]
Wang S.-Q. [1 ]
Tang Y. [1 ]
Chen Z.-Q. [1 ]
机构：
[1] Key Laboratory of Wind and Bridge Engineering of Hunan Province, Hunan University, Changsha
来源：
Hua, Xu-Gang (cexghua@hnu.edu.cn) | 1600年 / Chang'an University卷 / 34期
基金：
中国国家自然科学基金;
关键词：
Bridge engineering; Flutter; Flutter analysis; Lateral aerodynamic force; Sectional model test; Stress-ribbon bridge; Suspension bridge;
D O I：
10.19721/j.cnki.1001-7372.2021.01.006
中图分类号：
学科分类号：
摘要：
By means of a three-dimensional flutter analysis method, the three-dimensional flutter characteristics of a 618 m-long (main span) stress-ribbon bridge (SRB) were analyzed, and were compared with those of the traditional suspension bridge (TSB) with the same span length. The multi-modal participation effect, the lateral-motion induced self-excited forces and the mode selection problem of sectional model flutter test are discussed. Both two-dimensional flutter analysis and section model test are carried out by using different combinations of two modes for SRB. In contrast to the torsional-mode-driven flutter of TSB, the flutter of SRB is originated from the natural lateral-torsional coupled mode of SRB, and has a lower flutter critical velocity. The characteristic motion at flutter onset is dominated in the lateral, vertical and torsional directions, and the lateral self-excited forces have minor effect on critical flutter speed of SRB. It is shown that the combination of the lateral-torsional coupled mode and the vertical mode gives the lowest critical flutter speed. Moreover, the two-dimensional results are in good agreement with the 3D flutter analysis results, indicating that the multi-modal participation effect of SRB is not obvious. This study shows the importance of 3D flutter analysis and mode selection method in sectional model, and can also provide reference for the flutter research of other new-type long-span bridges. © 2021, Editorial Department of China Journal of Highway and Transport. All right reserved.
引用
收藏
页码：57 / 65
页数：8
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