【作者】 杨光；

【导师】 张建；

【作者基本信息】 北京交通大学 ， 建筑与土木工程（专业学位）， 2019， 硕士

【摘要】 随着我国电力、化工和煤炭等领域快速的发展及国家对环保要求的提高,大容量干煤棚或全封闭的贮煤场已经成为必备品。高低跨柱面屋盖结构因能满足堆取料机运行空间大且单位面积造价相对较低,一直是设计应用的首选。但由于跨度和长度受到限制,单个建筑结构容量在一定的范围内,不能满足大机组、大煤场的堆煤容量要求,因而通常采用两个乃至多个单体干煤棚连续布置方案来解决。目前针对柱面屋盖抗风研究成果主要集中在单跨和等高双跨柱面屋盖方面,在现有对高低跨柱面屋盖风荷载研究较少的情况下,以其为研究对象显然是有必要的。本文现采用风洞试验方法对高低跨柱面屋盖风荷载特性进行探究,同时为了更加精确进行屋盖区域的抗风设计,本文采用了数值模拟计算方法对屋盖结构的内压进行了研究,并使用K-means聚类算法和SD有效性指标结合的方法对屋盖风压进行分区,主要内容有以下几方面:(1)采用风洞试验方法对柱面屋盖结构表面的平均风压、脉动风压及全风向角下极值进行试验研究,并与单跨和等高双跨柱面屋盖表面各风压趋势进行对比分析。对于高低跨柱面屋盖结构,发现其高跨部分与低跨部分相互之间有着显著的影响,而且在高低跨屋盖交界处会有往复出现的正压区域,在做设计时应引起注意。(2)面向大尺度高低跨柱面屋盖结构,同时采用数值模拟计算方法分析了单跨柱面屋盖表面的风压分布,并与相关风洞试验结果对比分析,研究了单跨与高低跨柱面屋盖结构内压的分布特性。(3)采用K-means聚类算法及SD有效性指标确定最佳k值的方法对高低跨柱面屋盖进行风压分区研究,对此类屋盖表面的平均风压及极值风压系数的分区数目、分区形态以及各区风压系数值进行了分析,且分区方法可适用其他结构。更多还原

【Abstract】 With the development of electric power,chemical industry,coal and other industries in China and the improvement of the state environmental protection requirements,large capacity of dry coal shed or totally enclosed coal storage yard has become a necessary product.The high and low span cylindrical roof structure has always been the first choice of design application,because it can meet the operation space of stacker and the unit area cost is relatively low.However,due to the limitation of span and length,the capacity of a single building structure is within a certain range,which cannot meet the requirements of coal heap capacity of large units and large coal mines.Therefore,the layout scheme of using two single dry coal shed is adopted to solve the problem.At present,the wind resistance studies of cylinder roof have focused on single span roof and the double span cylinder roof of equal height.In the case of the less existing research of the unequal-height cylindrical roof about wind load,it is necessary that it was taken as the research object,and use wind tunnel test method to explore the wind load characteristic of the unequal-height cylindrical roof in this paper.At the same time,for the wind resistance design of roof area was carried out more accurately,the internal pressure of roof structure is studied by numerical simulation,and the method of connecting k-means clustering algorithm with SD validity index is used to partition the wind pressure of the roof.The main content has the following aspects.(1)The wind tunnel test is used to test and study the average wind pressure,pulsating wind pressure and the extreme wind pressure at the full wind direction angle on the surface of the cylindrical roof,and were compared and analyzed with wind pressure of the single-span and equal-height double-span cylindrical roof.For the unequal-height span cylindrical roof structure,it found that the high span part and the low span part have significant influence on each other.In addition,there will be reciprocating positive pressure area at the junction of unequal-height roof,which should be noted in the design.(2)Based on the large-scale unequal-height cylindrical roof structure,at the same time,the numerical simulation is used to study the wind pressure distribution rule of the single-span cylinder roof,and the result of the simulation is contrasted with the related wind tunnel test result,studying the distribution characteristics of internal pressure in single-span and unequal-height span cylindrical roof.(3)In this paper,k-means clustering method and the SD effectiveness index are used to determine the optimal k value for the wind pressure partition study of the high and low span cylindrical roof,and conclude the partition type numbers,partition form and the wind pressure coefficient of each area about the average wind pressure,extreme wind pressure coefficient of this kind of roof surface,and the partitioning method can be applied to other structures.更多还原