Flutter Mechanisms of Long Spanned Bridge Sections Based on Structural and Aerodynamic Characteristics

基于结构和气动特性的大跨度桥梁断面颤振机理

• 批准号: 09450176
• 负责人: MATSUMOTO Masaru
• 金额: $ 8.45万
• 依托单位: KYOTO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09450176/
• 关键词: flutter instabilities; long spanned bridges; separated box gerders; grating; unsteady aerodynamic force; flutter analysis; フラッター振動; フラッター解析; 剥離制御

Flutter mechanisms and its stabilization for long spanned suspension bridges have been studied, and the results are as follows.・The flutter characteristics of new bridge sections, which models are rigidly combined with 2 or 4 rectangular cylinders, are examined using wind tunnel. 2-parallel rectangular section model becomes quite unstable with some wind angle of attack. However, 4-recgtangular model has rather stable flutter chracteristics mounting the each small section in the right place.・A windmill is mounted at the leading edge of the bridge section to control the flutter instabilities. The windmill can control the inner circulatory flow and then the flutter instabilities also can be reduced.・Open air ratio of grating between two separated box girders are changed and their flutter chracteristics are investigated. In the case of rhombus 2-box Girdersection with 40% open grating ratio, the flutter onset wind speed becomes twice higher than that of thin plate. Therefore, it is rather important chose the best open air ratio of the grating for each bridge sections.

本文对大跨度悬索桥的颤振机理及其减振进行了研究，取得了以下成果。利用风洞试验研究了2个或4个矩形柱体刚性组合的新桥段的颤振特性。当风攻角一定时，2平行矩形截面模型变得非常不稳定。然而，4-矩形模型在正确的位置安装了各个小截面，具有较稳定的颤振特性。·在桥段前缘安装风车以控制颤振不稳定性。风车可以控制内循环流动，从而减少颤振不稳定性。改变两分离箱梁间格栅的露天比，研究其颤振特性。在开口格栅比为40%的菱形两箱梁截面情况下，颤振起始风速比薄板高一倍。因此，为每个桥段选择最佳的格栅露天比是十分重要的。

项目成果

松本 勝: "矩形断面の空間的配置によるフラッター特性に関する研究" 第15回 風工学シンポジウム論文集. 419-424 (1998)

松本正：“基于矩形截面空间排列的颤振特性研究”第15届风工程学会论文集419-424（1998）。

Masaru Matsumoto: "Aerodynamic deivatives and flutter stabilities of tandem rectangular cylinders"Proceedings of 15th National Symposium on Wind Engineering. 413-418 (1998)

松本正：《串联矩形圆柱体的气动导数与颤振稳定性》第十五届全国风工程学术研讨会论文集。

Masaru Matsumoto: "Flutter stabilization of Super-long Span Bridge-Aerodynamic Characteristics of Rectangular Cylinders"Proceedings of the 6th East Asia-Pacific Conference on Structural Engineering and Construction. vol.3. 2251-2256 (1998)

松本正：《超长跨度桥梁的颤振稳定性——矩形圆柱体的气动特性》第六届东亚太平洋结构工程与施工会议论文集。

Masaru Matsumoto: "Flutter stabilization of long span bridges" Structural Safety and Reliability. Vol.2. 1387-1394 (1998)

Masaru Matsumoto：“大跨度桥梁的颤振稳定性”结构安全性和可靠性。

Masaru Matsumoto: "Flutter Stabilization of Super-long Span Bridge-Aerodynamic Characteristics of Rectangular Cylinders"Proceedings of the 6th East Asia-Pacific Conference on Structural Engineering and Construction. 3. 2251-2256 (1998)

松本正：《超长跨度桥梁的颤振稳定——矩形圆柱体的气动特性》第六届东亚太平洋结构工程与施工会议论文集。