Investigation on wind-induced vibration of stay-cables based on field measurements of large-scale cable model and wind tunnel tests

基于大型拉索模型现场测量和风洞试验的斜拉索风振研究

基本信息

批准号：
12305030
负责人：
MATSUMOTO Masaru
金额：
$ 27.83万
依托单位：
Kyoto University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2002
项目状态：
已结题

项目摘要

In this study, to clarify the mechanisms of high-speed vortex induced vibration, rain-wind induced vibration and galloping for the stay-cables, the field observations using large-scale inclined cable models and wind tunnel tests were conducted. From the field observation tests, the following results were obtained.・The vibrations which seems to be the rain-wind induced vibration were observed under raining condition.・The galloping type vibrations with the first out plane mode were observed when a typhoon passed the site. Generally, the galloping must be reduced under high turbulent flow. Therefore, the further research will be needed. However, there might be a possibility of galloping on the real stay-cables.Also, the results from the wind tunnel tests were as follows.・The upper water rivulet on the cable surface due to the rain fall and the wind turbulence have important rolls on the high-speed vortex induced vibration.・Frequency variation of Karman vortex sheddings along the cable axis might induce the high-speed vortex induced vibration. Also, the position of upper water rivulet must be an important factor. Furthermore, there are two kinds of Karman vortex frequencies exist, if the position of artificial water rivulet on the cable model surface varies, and then, the reduced wind velocity, using the frequency as the difference of these two frequencies, coincides with the reduced wind velocity for high-speed vortex induced vibration.・To evaluate the inclined effects on the static force for inclined cable, the splitter plate was installed in the wake of circular cylinder with artificial water rivulet, and then, the static forces for inclined cables with water rivulet can be measured and seems to be rather reasonable.・Using the upper results, high-speed vortex induced vibration including rain-wind induced vibration is rather hard to explain by the quasi-steady theorem.

在此螺柱中，使用大型倾斜电缆模型和风隧道测试进行了高速涡流的振动，降雨诱导的振动和疾驰的机制。在雨季中观察到降雨的振动，当台风通过壁炉旁时，观察到了第一个振动的振动。在真实的住宿中。此外，风隧道测试的结果如下。电缆轴可能会诱导高速涡流引起的振动。频率d对倾斜电缆的静态力的影响，在带有人造水的铆钉的西里林中安装了拆分板，然后可以测量静态的固定电缆，似乎可以测量水铆钉，似乎D涡流诱导了振动准稳定定理很难解释振动。