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.

在这项研究中，为了阐明高速涡流引起的振动的机制，雨风诱导的振动和疾驰的入住机制，使用了大规模的倾斜有线模型和风洞测试的现场观察。从现场观察测试中，获得了以下结果。・在雨水条件下观察到雨风诱导的振动。・捕获泳装型振动，当台风通过了该地点时，观察到了第一个熄灭平面模式。通常，必须在高湍流下减少疾驰。因此，将需要进一步的研究。但是，可能有可能在真实的住宿列表上疾驰。此外，风洞测试的结果如下。・・降雨引起的电缆表面上的水对流，而风湍流在高速涡流上具有重要的滚动，引起了高速振动的频率。同样，上水铆钉的位置必须是一个重要因素。此外，如果人工水对流在电缆模型上的位置各种，然后使用降低的风速作为这两个频率的差异，则存在两种卡尔曼涡流频率，如果这两个频率的差异，则与降低的风速相吻合，以评估高速触发式振动的平板效果。用人造水铆钉的圆柱圆柱体，然后，可以测量带有水铆钉的倾斜电缆的静电力，似乎是相当合理的。・使用上层结果，高速涡流诱导的振动，包括雨水诱导的振动，很难通过Quasi-Steady-Steady Theorem来解释。