Fundamental Study on Effect of Turbulence on Aerodynamic Response of Bridge Structures

湍流对桥梁结构气动响应影响的基础研究

• 批准号: 02452191
• 负责人: SHIRAISHI Naruhito
• 金额: $ 2.82万
• 依托单位: Kyoto University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1990
• 资助国家: 日本
• 起止时间: 1990 至 1991
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-02452191/
• 关键词: Bridge Structures; Aerodynamic vibration; Turbulent Effect; Shear Layer Instability; Vortex-Induced Oscillation; Reynolds Number Effect; Aerodynamic Stability; Atmospheric Turbulence; レインバイブレ-ション; 耐風安全性; 気流シミュレ-ション

In order to clarify the effect of flow turbulence on aerodynamic vibration phenomena for bridge structures and characteristics of atmospheric turbulence, the following items are mainly discussed during the term of project ;(1) Generation mechanism of vortex-induced oscillation-by applied sound experiment and effect of turbulence (1990),(2) Cable-aerodynamics and effect of turbulence (1990),(3) Safety evaluation of bridge structures due to strong natural winds (1990),(4) Simulation of atmospheric turbulence (1990),(5) Turbulence effect on vortex-induced oscillation for bluff hexagonal bridge girder section (1991),(6) Reynolds number effect on aerodynamic response of rectangular cross section with corner-cut (1991),(7) Evaluation of surface roughness parameters (1991).Consequently, the destabilization effects of turbulence were observed in some cases, such as vortex-induced oscillation for bluff hexagonal cross section with handrails, rain-wind induced vibration of inclined cable, and so on. Besides, it was concluded that the effect of turbulence could be explained in terms of frequency dependence of velocity fluctuation on the instability of shear layer being developed around a bluff body. Strong Influence of Reynolds number (based on the height of body) upon maximum amplitude of vortex-induced oscillation, critical wind velocity of galloping oscillation was also clarified for a bluff rectangular cross section with corner-cut. The evaluation method of surface roughness parameters as well as the equipment for field observation of natural winds were newly developed and confirmed their applicability. Safety evaluation for bridge structures, in which the properties of aerodynamic responses, natural winds are taken into account, was also proposed.

为了弄清流动湍流对桥梁结构气动振动现象的影响以及大气湍流的特性，项目期间主要讨论了以下几个项目：(1)涡激振荡的产生机理——应用声实验及湍流效应（1990），(2)索空气动力学及湍流效应（1990），(3)强自然风作用下桥梁结构的安全性评价（1990），(4)大气湍流模拟（1990），(5)湍流对钝面六角形桥梁梁截面涡激振荡的影响（1991），(6)雷诺数对矩形截角截面气动响应的影响（1991）、(7)表面粗糙度参数的评价（1991）。因此，湍流的失稳效应在某些情况下被观察到，如带扶手的钝六角形横截面的涡激振动，倾斜斜拉索的风雨激振等。此外，湍流的影响可以用速度波动对钝体周围形成的剪切层不稳定性的频率依赖性来解释。雷诺数（以体高为基础）对涡激振荡最大振幅的影响较大，并明确了带切角的钝矩形截面的驰振临界风速。提出了新的地表粗糙度参数评价方法和野外自然风观测设备，并验证了其适用性。提出了考虑空气动力响应和自然风特性的桥梁结构安全评价方法。

项目成果

Jia-Yi Chen: "An Independent Method to Determine the Surface Roughness Parameter" Bulletin of the Disaster Prevention Research Institute, Kyoto Univ.41(2). 121-127 (1991)

陈嘉义：“确定表面粗糙度参数的独立方法”京都大学防灾研究所公告41(2)。

Jia-Yi CHEN: "An Indipendent Method to Determine the Surface Roughness Parameter" Bulletin of the Disaster Prevention Research Institute,Kyoto University. vol.41(2). 121-127 (1991)

陈嘉义：“一种确定表面粗糙度参数的独立方法”京都大学防灾研究所通报。

JiaーYi CHEN: "An Indipendent Method to Determine the Surface Roughness Parameter" Bulletin of the Disaster Prevention Research Institute,Kyoto University. vo1.41(2). 121-127 (1991)

陈嘉义：“确定表面粗糙度参数的独立方法”京都大学防灾研究所通报 vo1.41(2) (1991)。

Stoyan STOYANOFF: "六角形箱桁断面の渦励振への乱流不安定化効果に関する研究" 平成4年度土木学会関西支部年次学術講演会.

Stoyan STOYANOFF：“六角箱梁截面涡激失稳效应研究”日本土木工程学会关西分会1992年学术年会。

松本 勝: "音響刺激による橋梁断面の剥離せん断層不安定性増幅に関する研究" 京都大学防災研究所年報.

松本正：《声刺激放大桥梁断面分离剪切层不稳定性的研究》京都大学防灾研究所年度报告。