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矩形高层建筑风力特性风洞试验研究

Experimental study on wind force characteristics of rectangular tall buildings
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摘要 在大气边界层风洞试验室中模拟出B、C、D三类地貌,对不同厚宽比、高宽比的矩形截面高层建筑模型进行了同步测压试验,研究了厚宽比、高宽比和地貌类型等因素对矩形截面高层建筑风力特性的影响规律。结果表明:随着厚宽比增大,顺风向平均风力先增大后减小,脉动风力逐渐减小,横风向脉动风力逐渐增大,扭转向脉动风力先减小后增大,层脉动升力和脉动扭矩功率谱峰值变小,谱峰带宽增加,横-扭相关性减弱;随着高宽比增大,顺风向平均风力增大,高宽比对脉动风力特性影响较小;地貌类型从B至D,顺风向平均风力减小,脉动风力增大,横风向脉动风力整体上变化较小,扭转向脉动风力在D类地貌下明显比B、C类地貌大,层脉动升力和脉动扭矩功率谱B类地貌下有明显的窄带尖峰,横-扭相关性明显高于C、D类地貌。 A series of rectangular tall building models with different side ratios and aspect ratios were tested in a boundary wind tunnel by synchronous pressure measurement technology. The influence on the wind force characteristics of rectangular tall buildings caused by the terrain category, side ratio and aspect ratio were investigated. The results indicated that with the increase of side ratios, the along-wind mean force firstly increased and then decreased while the RMS force decreased;the cross-wind RMS force increased gradually and the RMS torque increased after decreased firstly;the peak values of spectrum for RMS lift force and RMS torque became smaller but the bandwidth of spectrum peak value increased;the correlation between cross-wind and torsional-wind force decreased. As the aspect ratios increase, the along-wind mean force increased and the RMS force almost kept the same. When the terrain categories varied from B to D, the along-wind mean force decreased but RMS force increased;the variation of cross-wind RMS force could be neglected;the torsional-wind RMS force in terrain D is larger than B and C. The spectrum for RMS lift force and RMS torque showed obvious narrow-band peak in terrain B and the correlation between cross-wind and torsional-wind is more related than C and D.
作者 张明月 李永贵 李毅 刘思嘉 ZHANG Mingyue;LI Yonggui;LI Yi;LIU Sijia(Hunan Provincial Key Laboratory of Structures for Wind Resistance and Vibration Control,Hunan University of Science and Technology,Xiangtan 411201,China)
出处 《自然灾害学报》 CSCD 北大核心 2019年第1期123-131,共9页 Journal of Natural Disasters
基金 国家自然科学基金项目(51878271,51508183,51708207) 湖南省教育厅开放基金项目(15K044).
关键词 高层建筑 风力系数 功率谱密度 相关性 风洞试验 tall building wind force coefficients power spectral densities correlation wind tunnel test
作者简介 张明月(1994-),女,硕士研究生,主要从事结构风工程研究.E-mail:1838303758@qq.com;通讯作者:李永贵(1981-),男,副教授,博士,主要从事结构风工程研究.E-mail:lyg@hnust.edu.cn
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