期刊文献+

下击暴流作用下不同深宽比的高层建筑风荷载 被引量:7

Wind loads of high-rise buildings with various aspect ratios in downburst wind
下载PDF
导出
摘要 为研究下击暴流作用下高层建筑的风荷载特性,采用冲击射流装置对5种不同深宽比的高层建筑模型进行测压试验,分析了深宽比和径向距离对模型局部和整体风荷载的影响.结果表明:层阻力系数沿高度方向呈下大上小的分布特征,最大层阻力系数出现在0.25H(H为建筑高度)左右,层脉动升力系数沿高度变化较为平缓;随深宽比的增大,层平均阻力系数略有减小,层脉动升力系数显著增大,模型整体的平均阻力系数和顺风向弯矩系数略有减小,整体的脉动升力系数及横风向弯矩系数明显增大;随径向距离的增大,层平均阻力系数迅速减小,层脉动阻力系数和脉动升力系数先增大后减小,模型整体的平均阻力系数和弯矩系数迅速减小,整体的脉动阻力及升力系数先增大后减小. To study the wind load characteristics of high-rise buildings in downburst wind, an impinging jet device was used to carry out the pressure tests on 5 high-rise building models with different depth-to-width ratios. The influence of the aspect ratio and the radial distance on the local and overall wind loads was analyzed. The results show that the distribution characteristics of the layer drag coefficients along the height direction are larger in the lower part and smaller in the upper part of the building models. The maximum of the layer drag coefficients occurs at the height of about 0.25 H ( H is the height of the building), and the fluctuating lift coefficients of the layers change smoothly along the height. With the increase of the depth-to-width ratio, the average of the layer drag coefficients decreases slightly while the fluctuating layer lift coefficient increases significantly;as for the whole model, the mean drag coefficient and the along-wind bending moment coefficient decrease slightly, while the fluctuating lift coefficient and the cross-wind bending moment coefficient increase obviously. With the increase of the radial distance, the mean layer drag coefficient decreases rapidly;the fluctuating layer drag coefficient and the lift coefficient increase first and then decrease;as for the whole model, the mean drag coefficient and the bending moment coefficient decrease rapidly, while the fluctuating drag and the lift coefficient increase first and then decrease.
作者 方智远 李正良 汪之松 Fang Zhiyuan;Li Zhengliang;Wang Zhisong(School of Civil Engineering,Chongqing University,Chongqing 400045,China;Key Laboratory of New Technology for Construction of Cities in Mountain Area of Ministry of Education,Chongqing University,Chongqing 400045,China)
出处 《东南大学学报(自然科学版)》 EI CAS CSCD 北大核心 2019年第3期488-494,共7页 Journal of Southeast University:Natural Science Edition
基金 国家自然科学基金资助项目(51208537)
关键词 下击暴流 冲击射流 高层建筑 风荷载 downburst wind impinging jet high-rise building wind loads
  • 相关文献

参考文献3

二级参考文献25

  • 1日本建筑学会.建筑风荷载流体计算指南[M].北京:中国建筑工业出版社.2010年12fiJ.
  • 2LETCHFORD C W, MANS C M, CHAY M T. Thunder- storms-their importance in wind engineering: a case for the next generation wind tunnel[J]. Journal of Wind Engineering and Industrial Aerodynamics, 2002, 90 (12/13/14/15) : 1415 -1433.
  • 3FUJITA T T. The downburst: mieroburst and macroburst: report of projects NIMROD and JAWS[R]. Chicago: Univer- sity of Chicago, 1985.
  • 4OSEGUERA R M, BOWLES R L. A simple analytic 3-dimen sional downburst model baaed on boundary layer stagnation in flow, NASA technical memorandum 100632[R]. Hampton Longlay Research Center, NASA, 1988.
  • 5HOLMES J D, OLIVER S E. An empirical model of a down- burst [J]. Engineering Structures, 2000, 22 : 1167- 1172.
  • 6SENGUPTA A, SARKAR P P. Experimental measurement and numerical simulation of an impinging jet with application to thunderstorm microburst winds[J]. Journal of Wind Engineer- ing and Industrial Aerodynamics, 2008,96(3): 345-365.
  • 7ZHANG Yan, HU Hui, SARKAR P P. Modeling of micro- burst outflows using impinging jet and cooling source approa- ches and their comparison [J]. Engineering Structures, 2013, 56: 779-793.
  • 8CHAY M T, LETCHFORD C W. Pressure distributions on a cube in a simulated thunderstorm doWnburst. Part A: Station- ary downburst observations[J]. Journal of Wind Engirieering and Industrial Aerodynamics, 2002, 90(7):711-732.
  • 9LETCHFORD C W, CHAY M T. Pressure distributions on a cube in a simulated thunderstorm downburst. Part B: Moving downburst observations[J]. Journal of Wind Engineering and Industrial Aerodynamics, 2002, 90(7)..733-7531.
  • 10SENGUPTA A, HAAN F L, SARKAR P P. Transient loads on buildings in microburst and tornado winds[J]. Journal of Wind Engineering and Industrial Aerodynamics, 2008, 96(10/ 11) :2173-2187.

共引文献24

同被引文献58

引证文献7

二级引证文献13

相关作者

内容加载中请稍等...

相关机构

内容加载中请稍等...

相关主题

内容加载中请稍等...

浏览历史

内容加载中请稍等...
;
使用帮助 返回顶部