Study of Microburst Winds and Their Loading Effects on Built Structures

微爆风及其对建筑结构荷载效应的研究

• 批准号: 1000198
• 负责人: Partha Sarkar
• 金额: $ 28万
• 依托单位: Iowa State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-06-01 至 2014-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1000198&HistoricalAwards=false
• 关键词: Study; Microburst; Winds; Their; Loading

The objective of this project is to conduct a fundamental study to quantify the characteristics of violent microburst winds and their loading effects on ground-based civil structures. A synergistic approach is used in this study that involves laboratory simulations using a translating microburst simulator and scaled models of civil structures, numerical simulations using CFD, and field data for validation of the simulated flow field. Particle Image Velocimetry is used to provide detailed flow-field measurements while existing CFD models are extended to include buoyancy effects to verify the similarities between a natural microburst generated by descending cold air with those generated in laboratory simulations. The characteristics of unsteady flow structures of microburst winds and resultant wind loads on civil structures are investigated in great detail. One of the outcomes of this study will be knowledge of wind-speed profiles of microburst winds in various terrains, and a catalog of aerodynamic loads for typical civil structures that will be useful for future design of such structures. The goal of this project is to elucidate the underlying physics for a better understanding of microburst wind hazard in order to provide more accurate prediction of wind damage potential to built structures with the ultimate goal of reducing the loss of life or injury and economic loss. Society at large will benefit significantly from improved predictions of damage potential of violent near-ground winds and improved building or design codes that can help in mitigating this type of wind hazard. This project will also benefit graduate, undergraduate and K-12 students as well as public in general through improved curricula, laboratory demonstrations, Internet-based disseminations and news media outlets.

该项目的目的是进行一项基本研究，以量化暴力微型风的特征及其对地面民用结构的负载影响。在这项研究中使用了一种协同方法，该方法涉及使用翻译的微库模拟器和民用结构模型，使用CFD的数值模拟以及用于验证模拟流场的现场数据。粒子图像速度法用于提供详细的流场测量值，同时扩展了现有的CFD模型以包括浮力效应，以验证通过降落的冷空气与实验室模拟中产生的自然微生物之间的相似性。非常详细研究了微库斯特风的不稳定流量结构和最终的风负载的特征。这项研究的结果之一将是了解各个地形微库斯特风的风速曲线，以及用于典型的民用结构的空气动力载荷目录，这将用于将来的这种结构的设计。该项目的目的是阐明潜在的物理，以更好地了解微库斯特风危害，以便更准确地预测风损伤对建筑结构的潜在，以减少生命或伤害和经济损失的最终目标。整个社会将通过改善暴力近地风的破坏潜力以及改进的建筑物或设计代码的预测可显着受益，这可以帮助缓解这种风险危害。该项目还将通过改进的课程，实验室示范，基于互联网的传播和新闻媒体的改进，从而使研究生，本科生和K-12学生以及一般公众受益。