Fundamental Study on Wind-induced Vibrations of Long-Spanned Linelike Structures

大跨度线状结构风振基础研究

基本信息

批准号：
05452371
负责人：
ITO Manabu
金额：
$ 4.29万
依托单位：
Saitama 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：
1993
资助国家：
日本
起止时间：
1993 至 1994
项目状态：
已结题

项目摘要

Long-spanned linelike structures such as UHV transmission lines and cable-supported bridges are so flexible that the dynamic stability against wind actions must be checked in their design. Because of the very long span, there are some peculiar problems which should be studied carefully. One of the problems is the effect of non-uniformity of the wind action along the span of structure on its wind-induced vibrations. In the present study, partially uniform wind was considered and the characteristics of structural vibrations induced by the localized wind action were investigated experimentally and analytically. The wind tunnel with the testing section of 50*50 cm in Saitama University were used for the experiments.The main research results are summarized as follows.1.The wind tunnel experiments were conducted with long-spanned taut strip model, a part of which was subjected to the wind flow. The models with two different cross-sections were considered in the study : One is a rectangular cylinder and another is a circular cylinder. The wind-induced vibrations of the taut strip models were measured by taking the location of the partially uniform wind as well as the length of uniform wind action as fundamental testing parameters. The changes in the structural responses, such as vibration modes, caused by localized action of wind were discussed in detail.2.The propagation of waves in the long-spanned structures was analyzed and its characteristics was investigated in the case of taut strings. The active wave control of sagged cable vibrations was also dealt with in the study and its control performance was also investigated.

长期跨度的线性结构，例如UHV传输线和电缆支持的桥梁是如此灵活，以至于必须在其设计中检查针对风能的动态稳定性。由于跨度很长，因此应该仔细研究一些特殊的问题。问题之一是风能沿结构跨度不均匀的影响对风能引起的振动。在本研究中，考虑了部分均匀的风，并通过实验和分析研究了由局部风作用引起的结构振动的特征。在Saitama University的测试部分的风洞进行了实验。主要的研究结果总结如下。1。风洞实验是使用长期跨度的拉特条带模型进行的，其中一部分是其中的一部分受到风流。在研究中考虑了具有两个不同横截面的模型：一个是矩形圆柱体，另一个是圆柱体。通过将部分均匀的风的位置以及均匀的风能作为基本测试参数来测量绷紧条模型的风引起的振动。详细讨论了由风的局部作用引起的结构响应的变化，例如振动模式。2。分析了长期跨度结构中的波的传播，并在绷紧的字符串的情况下进行了研究，并研究了其特征。在研究中还处理了下垂电缆振动的主动波控制，还研究了其控制性能。