Structural Response in Transient Winds of Hurricanes and Downbursts

飓风和下击暴流的瞬变风中的结构响应

• 批准号: 1537431
• 负责人: Teng Wu
• 金额: $ 27.99万
• 依托单位: SUNY at Buffalo
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-09-01 至 2020-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1537431&HistoricalAwards=false
• 关键词: Structural; Response; Transient; Winds; Hurricanes

The assurance of public safety and the integrity of bridges and infrastructure during hurricanes and downbursts require accurate modeling of wind-induced effects. The transient characteristics of extreme winds are neither well understood nor characterized, which makes pre-event analysis difficult. This project pursues fundamental research to develop analytical model to analyze structural response in hurricane and downburst winds. Results will contribute to design standards that are used to assess response of flexible structures. A wind-field simulator will be developed and deployed as an on-line tool to enable designers, researchers and educators to simulate the effects of hurricane and downburst winds.The primary goal of the research is to develop effective analysis tool to characterize and simulate the nonstationary wind-velocity fields and transient wind-load effects during non-synoptic events of hurricanes and downbursts. A systematic time-frequency analysis and synthesis framework, which can integrate the time-invariant (traditional) and/or time-variant spatial coherence into the simulated nonstationary wind-velocity fields, will be developed. The framework will facilitate an understanding of the underlying physics of transient wind-load effects for wind-structure interaction analysis. The study will assess the impact of nonstationary wind inputs in terms of their static, quasi-static and dynamic effects on structural response, and investigate modification of aerodynamic parameters. Joint acceptance functions, based on the nonstationary wind fields with various spatial coherences, and their effects on structural response will be examined. The Hilbert and wavelet techniques will be employed for the analysis and synthesis of nonstationary wind-velocity fields, and their efficacy will be assessed. The nonstationary features of hurricanes and downbursts will be investigated using data from field measurements, experiments, and numerical simulations. The transient aerodynamics will be illustrated using flexible bridges, with results also being relevant to the assessment of buildings and other structures.

为了确保飓风和下击暴流期间的公共安全以及桥梁和基础设施的完整性，需要对风致效应进行精确建模。极端风的瞬态特性既没有得到很好的理解，也没有得到很好的表征，这使得事前分析变得困难。该项目进行基础研究，开发分析模型来分析飓风和下击暴流中的结构响应。研究结果将有助于设计标准，用于评估响应的柔性结构。本研究的主要目的是发展有效的分析工具，以描述和模拟飓风和下击暴流等非天气事件期间的非定常风速场和瞬态风荷载效应。将开发一个系统的时频分析和合成框架，该框架可以将时不变（传统）和/或时变空间相干性集成到模拟的非平稳风速场中。该框架将有助于理解风-结构相互作用分析的瞬态风荷载效应的基本物理。该研究将评估非平稳风输入对结构响应的静态、准静态和动态影响，并研究气动参数的修改。联合接受函数，基于非平稳风场与各种空间相干性，以及它们对结构响应的影响将被检查。希尔伯特和小波技术将用于分析和合成非平稳风速场，并将评估其功效。飓风和下击暴流的非定常特征将使用来自现场测量、实验和数值模拟的数据进行研究。瞬态空气动力学将使用柔性桥梁进行说明，其结果也与建筑物和其他结构的评估有关。