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群体高层建筑风洞试验阻塞比计算方法
Calculation Method of Blocking Ratio in Wind Tunnel Test of tall Building complex
投稿时间:2019-12-30  修订日期:2020-05-06
DOI:
中文关键词:  阻塞效应  风洞试验  高层建筑  折算阻塞比
英文关键词:blocking effects  wind tunnel tests  tall buildings  reduced blockage ratio
基金项目:国家自然科学基金(51708186, 90715023)
作者单位E-mail
王磊 河南理工大学 土木工程学院 tumuwanglei@163.com 
刘红菊 河南理工大学 土木工程学院  
王泽康 河南理工大学 土木工程学院  
梁枢果 武汉大学 土木建筑工程学院  
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中文摘要:
      为了研究高层建筑群体风洞试验阻塞效应,并提出一个适用于群体高层建筑风洞试验的阻塞比计算方法,针对主体测压模型与周边模型相对位置、相对高度和模型数量不同时的17情况,分别进行了三组缩尺比的测压模型风洞试验,共计51个实验工况。分析了阻塞效应对风压系数和阻力系数的影响。结果表明,在周边模型与主体模型相对位置不同时,即便阻塞比相同,阻塞效应仍有很大差别。对单位阻塞比而言,周边模型造成的阻塞效应通常大于主体模型本身。既有阻塞比计算方法只适用于单体建筑风洞试验的情况,用其评估群体建筑风洞试验的阻塞效应,会造成“小阻塞比、大阻塞效应”和“阻塞比相同、阻塞效应不同”等矛盾现象。最后提出了折算阻塞比的概念,可以较好地评估群体建筑阻塞效应的影响程度。在进行实际高层建筑风洞试验时,将折算阻塞比(而不是传统定义的阻塞比)控制在一定范围内是一种更合理的做法。所提出的折算阻塞比计算方法可为高层建筑风洞试验缩尺比的确定提供参考。
英文摘要:
      In order to study the blocking effect and a calculation method of blocking ratio for wind tunnel test of tall building with many surrounding buildings, a series of wind tunnel test of pressure measurement were carried. Aiming at 17 experimental conditions with different the relative position, the relative height and the number of test models between the pressure models and the surrounding models, 3 scale ratio experiments of each experimental conditions were carried out, totaling 51 conditions. The influence of the blocking effect on the wind pressure coefficient and the drag coefficient was analyzed. Results show that when the relative position of the surrounding model and the pressure model are different, the blocking effect is usually not the same even if the blocking ratio is the same. For a unit blocking ratio, the blocking effect caused by the surrounding model is usually greater than the subject model itself. The existing calculation method of blocking ratio is only applicable to the wind tunnel test with a single building. which usually result in same contradictory phenomena for the evaluation the blocking effect of building complex, for example, “small blocking ratio, large blocking effect” and “same blocking ratio, different blocking effect " and so on. Finally, the concept of reduced blocking ratio is proposed, which can consider the influence blocking effect of wind tunnel test with building complex. The reduced blocking ratio of this study -not the traditionally defined blocking ratio- should be control within a certain range in the wind tunnel test of real high-rise buildings. The calculation method of reduced blocking ratio proposed in this paper can provide powerful guidance for determining the scale ratio of wind tunnel test of tall buildings.
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