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Study of the effects of wind power and vortex-induced vibrations to establish fatigue design criteria for high-mast poles.

机译：研究风力和涡激振动的影响，以建立高桅杆的疲劳设计标准。

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摘要

Traffic signal and high-mast poles are used by transportation agencies to control and illuminate intersections; their structural design is governed by national specifications. High-mast poles are luminaire supports located near highway interchanges that range from 80 to 140 feet in height. These flexible structures are susceptible to wind vibration which may lead to fatigue cracking near the weld toes.;In a previous related study conducted by the University of Wyoming (Phase I), fatigue cracking of traffic signal poles was determined to be related to the average wind speed (Price, 2009). However, high-mast data did not indicate the same behavior. The goal of this research is to gain a more complete understanding of the relation between wind speed and high-mast pole cracking. Surveys were sent to more state-bridge engineers to further the data collection of Phase I. It is hypothesized that the cracking of high-mast poles is caused by the resonant displacements of vortex-induced vibrations (VIV).;The Canadian Standards Association (CSA) code takes into account the details of VIV and was, therefore, selected to complete Phase II of this research. It was used to create a spreadsheet which predicts amplitudes of vibration of a high-mast pole located in Laramie, Wyoming. The output data were compared to field data of a local pole. This sheet was further used to predict base stresses and fatigue life as a function of local wind data.;The Phase II analysis process produced high-amplitude predictions compared to local field data; therefore, self-limiting concepts were researched in Phase III. A self-limiting concept for an oscillating member hypothesizes that the natural properties of the pole and the fluid interaction keep amplifications under a predictable maximum.
机译：交通机构使用交通信号灯和高桅杆来控制和照亮路口；其结构设计受国家规范约束。高桅杆是位于高速公路交汇处附近的灯具支撑，其高度在80到140英尺之间。这些柔性结构易受风振的影响，可能导致焊趾附近出现疲劳裂纹。；怀俄明大学先前进行的一项相关研究（第一阶段）中，确定交通信号杆的疲劳裂纹与平均值相关。风速（价格，2009年）。但是，高桅杆数据没有表明相同的行为。这项研究的目的是对风速和高桅杆裂纹之间的关系有一个更完整的了解。调查被发送给更多的州立桥梁工程师以进一步收集阶段I的数据。假设高桅杆的裂纹是由涡激振动（VIV）的共振位移引起的。 CSA）代码考虑到了VIV的细节，因此被选中完成本研究的第二阶段。它用于创建电子表格，该电子表格可预测位于怀俄明州拉勒米的高桅杆的振动幅度。将输出数据与本地极的现场数据进行比较。这张纸还被用来预测基础应力和疲劳寿命，作为局部风力数据的函数。相较于局部现场数据，第二阶段的分析过程产生了高幅度的预测；因此，在第三阶段研究了自我限制的概念。振荡构件的自限概念假设，磁极的自然属性和流体相互作用将放大倍数保持在可预测的最大值以下。

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  • 作者

    Johnson, Rebecca T.;

  • 作者单位

    University of Wyoming.;

  • 授予单位 University of Wyoming.;
  • 学科 Engineering Civil.;Alternative Energy.;Agriculture General.
  • 学位 M.S.
  • 年度 2011
  • 页码 117 p.
  • 总页数 117
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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