Mechanism of bridge flutter modes with modality-driven analysis method

被引：0
|
作者：
Zhu J. [1 ]
Yang Y. [1 ]
Xu H. [1 ]
Zhang J. [1 ]
Ge Y. [1 ]
机构：
[1] State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University, Shanghai
来源：
Tumu Gongcheng Xuebao/China Civil Engineering Journal | 2024年 / 57卷 / 03期
关键词：
coupling of modes; longitudinal distribution characteristic; suspension bridge; three-dimensional effect; three-dimensional flutter;
D O I：
10.15951/j.tmgcxb.22111148
中图分类号：
学科分类号：
摘要：
The three-dimensional effect of bridge flutter caused by multi-modes coupling effects is studied by quantitatively describing the influence of each mode and its distribution characteristic on the flutter evolution process. Firstly, the closed-form solution of the system damping and stiffness, which can reflect the contribution of each mode, is derived based on the excitation-feedback mechanism between the natural modes. A modality-driven analysis method suitable for three-dimensional flutter analysis has been established. Secondly, the overall system damping of the bridge is expanded along the span direction through Taylor formulas, and the quantitative relationship between the span segment and the aerodynamic performance is established, enabling the proposed method to quantify the influence of the span distribution characteristics of each mode. Then, the influence of modal participation and its distribution characteristic on flutter performance is systematically investigated by studying suspension bridges with a main span of 500~1500 m. Finally, the three-dimensional effect and its causes are revealed by comparing the results of two-dimensional and three-dimensional analyses. The research discloses that the results of three-dimensional two-mode coupling analysis shall be necessarily larger than those of two-dimensional analysis, because the basic heaving mode and the basic torsional mode are completely similar in the two cases. With the increase of wind velocities, the aerodynamic damping provided by the second-order positive symmetric heaving mode may change from negative to positive. The effect of this mode on bridge flutter performance depends on the ratio of its own frequency to the system flutter frequency. Furthermore, it is known that most of the aerodynamic damping is attributed to about 70% beam segments. © 2024 Chinese Society of Civil Engineering. All rights reserved.
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页码：81 / 92
页数：11
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