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.

使用风隧道检查了新桥截面的扑动，对长期跨越的悬浮桥的稳定及其稳定化已进行了研究，结果如下。・使用风隧道检查了新桥截面的扑动特性，该模型与2或4个矩形圆柱体结合在一起。随着一定的攻击角，2-平行的矩形截面模型变得非常不稳定。但是，4个重度模型具有相当稳定的颤动式旋转式，将每个小部分安装在正确的位置。・风车安装在桥截面的前缘，以控制扑动的不稳定性。风车可以控制内部电路流，然后也可以降低颤动的不稳定性。・露出两个单独的盒子盖仪之间的光栅比率更改，并研究了它们的颤抖的插曲。在菱形2盒梁的情况下，开放式光栅比率为40％，颤动的起风速度比薄板高两倍。因此，对于每个桥截面的光栅的最佳露天比非常重要。

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 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. 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: "Heaving Branch Coupled Flutter for long Span Bridge"Long-Span and High-Rise Structures, IABSE. 79. 259-264 (1998)

Masaru Matsumoto：“大跨度桥梁的起伏分支耦合颤振”大跨度和高层结构，IABSE。