不同坡度双坡屋盖表面风压特性研究

发布时间：2018-01-09 02:15

本文关键词：不同坡度双坡屋盖表面风压特性研究　出处：《建筑结构学报》2017年03期 　论文类型：期刊论文

【摘要】：通过提取东京工艺大学低矮建筑气动数据库中的风压数据,以点风压和面积平均风压为分析参数,研究了不同坡度双坡屋盖表面的风压特性。首先给出了正风向及斜风向作用下,屋盖表面的平均和脉动风压分布。其次,通过Hermite Model法计算了双坡屋盖表面各区格面积平均风压时程的峰值因子,进而计算得到各区格的风压统计峰值,并据此分析了双坡屋盖的最不利风向和易损位置。以迎风角区域为参考,计算了该区域与屋盖其余部位面积平均风压的相关特性。最后探讨了部分国家规范中双坡屋盖围护结构设计风荷载的相关条文,并针对GB 50009—2012《建筑结构荷载规范》给出了修订建议。研究结果表明,根据各坡度屋盖风压分布、风压相关性和风压统计峰值的特点,可将双坡屋盖分为3个坡度区间,即0°≤θ≤15°(低坡度)、15°θ≤30°(中等坡度)和30°θ≤45°(高坡度);在多数双坡屋盖表面,吸力统计极值的最大值均发生于斜风向作用下的迎风角区域;考虑最不利风向下不同部位风吸力幅值的差异,可将低坡度的屋盖表面分为角部、长边边缘、短边边缘和中部4个区域,中等坡度和高坡度的屋盖表面可在此基础上进一步细分出屋脊区域以及短边边缘与屋脊交接区域进行风压统计。
[Abstract]:By extracting the low building gas in Tokyo University of technology of dynamic wind pressure data in the database, with the average wind pressure and wind pressure area analysis parameters of wind pressure characteristics of different slope double slope roof surface. The first is given direction and oblique direction under the effect of mean and fluctuating wind pressure distribution of the roof surface. Secondly, the peak factor the average wind pressure of double slope roof surface area was calculated by the lattice Hermite Model method, and the statistical calculation of Wind Pressure Peak District grid, and analyzes the double slope roof the most unfavorable wind and vulnerable position. In the windward angle area for reference, the relevant characteristics of the mean wind pressure in the region and other parts of the roof area calculation. The last part discusses the relevant provisions of the national standard in the double slope roof design of retaining structure of wind load, and for the GB 50009 specification of 2012< building structure load are revised to build Discussion. The results show that according to the characteristics of wind pressure distribution on the roof slope, correlation and statistical peak wind pressure, can be divided into 3 double slope roof slope interval, i.e. 0 DEG angle less than or equal to 15 degrees, 15 degrees (low grade) is less than or equal to 30 degrees (moderate slope) and 30 degrees less than or equal to 45 degrees. (Gao Podu); in most double slope roof surface, maximum wind suction statistical extremes occurred in the wind under the action of oblique angle region; considering the most unfavorable wind down different parts of wind suction amplitude, can be divided into low roof surface slope angle, the long edge, the 4 edge and central region the short side, middle slope and high slope of the roof surface can be further subdivided into pressure ridge area and statistical short side edges and roof joint region.

【作者单位】：同济大学建筑设计研究院(集团)有限公司;上海防灾救灾研究所;同济大学土木工程学院;
【基金】：国家自然科学基金青年基金项目(51408353) 上海市青年科技启明星计划(15QB1404800)
【分类号】：TU312.1
【正文快照】： 0引言考虑到排水和隔热的需要,双坡屋盖是低矮建筑中较常采用的屋面形式。对于此种屋面,其坡度是影响来流运动及屋盖表面风压分布的重要因素[1]。Tominaga等[2]通过风洞试验和采用计算流体动力学(computational fluid dynamics,CFD)模拟分析,研究了不同坡度(16.7°、26.6°和3

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