Analytical Method to Assess Dynamic Response of Tall Buildings to Downburst Windstorm

评估高层建筑对下击暴流风暴动力响应的分析方法

• 批准号: 1434880
• 负责人: Luca Caracoglia
• 金额: $ 27.43万
• 依托单位: Northeastern University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2014
• 资助国家: 美国
• 起止时间: 2014-09-01 至 2018-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1434880&HistoricalAwards=false
• 关键词: Analytical; Method; Assess; Dynamic; Response

Vertical structures such as tall buildings and horizontal-axis wind turbines are prone to wind-induced vibrations and potential damage originating from complex wind-structure interaction. The relevance of this issue has attracted engineering researchers in recent years because of the tendency to erect taller buildings and larger-diameter-blade wind turbines in the United States and other parts of the World. The design of tall structures is usually based on steady and stationary wind load conditions. However, winds are often transient, such as in the case of a downburst storm, a meteorological phenomenon which induces an outburst of damaging wind loads near the ground. The study of transient wind loads is also relevant since increasing number of structures is damaged by this type of events. This project pursues to develop a viable computational method for the dynamic response assessment of tall structures against a downburst type of storm. This project will pursue a novel analytical method for assessing the stochastic dynamic response of tall structures due to transient wind loads. The method will account for system nonlinearity and aerodynamic coupling effects. The method will be based on the concepts of compactly supported wavelets and the Wavelet-Galerkin transform, which enables reducing a system of differential equations to an algebraic form by preserving time-frequency features in the modeling. The study will advance the utilization of Wavelet-Galerkin method for solving wind-induced coupled nonlinear stochastic dynamic problems. Moreover, the project will investigate the dynamics, caused by transient downburst-like winds, on a series of reduced-order models of tall structures. Examples will include two benchmark tall buildings and one large-diameter horizontal-axis wind turbine. The research will validate the analytical method by conducting wind tunnel experiments on scaled models of the benchmark buildings. Integrated outreach activities are planned to disseminate the findings of the study through educational tools.

高层建筑和水平轴风力涡轮机等垂直结构很容易受到风引起的振动以及复杂的风与结构相互作用造成的潜在损坏。近年来，由于美国和世界其他地区建造更高的建筑物和更大直径叶片的风力涡轮机的趋势，这个问题的相关性吸引了工程研究人员。高层建筑的设计通常基于稳定且固定的风荷载条件。然而，风通常是短暂的，例如下击暴流风暴，这是一种导致地面附近破坏性风荷载爆发的气象现象。瞬态风荷载的研究也很重要，因为越来越多的结构因此类事件而受损。该项目致力于开发一种可行的计算方法，用于评估高层建筑对下击暴流型风暴的动态响应。该项目将寻求一种新颖的分析方法来评估瞬态风荷载引起的高层结构的随机动力响应。该方法将考虑系统非线性和空气动力耦合效应。该方法将基于紧支持小波和小波伽辽金变换的概念，通过保留建模中的时频特征，能够将微分方程组简化为代数形式。该研究将推进小波伽辽金方法在解决风致耦合非线性随机动力问题中的应用。此外，该项目还将研究由瞬态下击暴流类风引起的一系列高层建筑降阶模型的动力学。示例包括两座基准高层建筑和一台大直径水平轴风力涡轮机。该研究将通过对基准建筑物的比例模型进行风洞实验来验证分析方法。计划开展综合外展活动，通过教育工具传播研究结果。