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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.

为明确斜拉索高速涡激振动、雨-风激振动和驰振机理，采用大尺度倾斜斜拉索模型和风洞试验进行了现场观测。通过现场观察试验，获得了以下结果：在下雨条件下观察到的振动似乎是风雨引起的振动。·当台风经过现场时，观察到具有第一出平面模式的飞奔型振动。一般来说，在高湍流条件下，必须减小驰动。因此，还需要进一步的研究。然而，有可能在真正的钢索上驰骋。此外，风洞试验的结果如下。·由于降雨和风的湍流，电缆表面的上层水流对高速涡激振动有重要的卷动作用。·沿电缆轴线卡门涡脱落的频率变化可能引起高速涡诱导振动。此外，上游河流的位置也一定是一个重要因素。此外，如果人工水流在索模型表面的位置发生变化，则存在两种卡门涡频率，那么将频率作为这两种频率的差值，则减小风速与高速涡诱导振动的减小风速一致。·为了评价倾斜对斜拉索静力的影响，将分流板安装在带有人工水线的圆柱尾迹上，可以测量出带有人工水线的斜拉索的静力，看起来比较合理。利用上面的结果，高速涡激振动包括雨-风激振动很难用准稳态定理来解释。