矩形截面高层建筑横风向脉动风荷载特性

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英文篇名：Characteristics of Across-wind Fluctuating Loads on Rectangular Tall Building 作者：袁深根 ; 李永贵 ; 孟灿 ; 周志锦 ; 罗晓勇 ; 陈辉 英文作者：YUAN Shengen;LI Yonggui;MENG Can;ZHOU Zhijing;LUO Xiaoyong;CHEN Hui;Xiangtan City Building Design Institute;College of Civil Engineering, Hunan University of Science and Technology; 关键词：矩形截面 ; 高层建筑 ; 风洞试验 ; 横风向风荷载 英文关键词：tall building;;wind tunnel test;;across-wind load;;calculation formula 中文刊名：湖南城市学院学报(自然科学版) 英文刊名：Journal of Hunan City University(Natural Science) 机构：湘潭市建筑设计院;湖南科技大学土木工程学院; 出版日期：2019-05-15 出版单位：湖南城市学院学报(自然科学版) 年：2019 期：03 基金：国家自然科学基金项目(51878271,51708207,51508183);; 湖南省教育厅开放基金项目(15K044) 语种：中文; 页：4-8 页数：5 CN：43-1428/TU ISSN：1672-7304 分类号：TU973.213

摘要

对不同厚宽比的矩形截面高层建筑模型进行了测压风洞试验﹒研究了横风向根方差升力系数、基底根方差弯矩系数、基底弯矩功率谱的基本特性﹒研究结果表明,根方差升力系数沿高度呈多项式曲线分布;基底根方差弯矩系数随厚宽比增大到一定值后变化不大;基底弯矩功率谱在厚宽比<3时只有1个谱峰,厚宽比=3时在高频段时出现了第2个谱峰;峰值频率在厚宽比<1时变化不大,此后随厚宽比的增大而减小;以厚宽比为自变量,拟合得到了相应的计算公式.
        The rectangular tall building models with different side ratios were tested with the pressure measuring technique in a boundary layer wind tunnel. The basic characteristics of the across-wind fluctuating loads on the tall buildings, including RMS of the lift coefficient, the RMS of the base moment coefficient and the power spectral density(PSD) of base moment were investigated in details. The results show that the polynomial curves can be used to describe the distribution of RMS of lift coefficient along the elevation. One spectral peak on the PSD of the across-wind base moment when side ratio less than 3 is observed, and another appears in high frequency band for the model with the side ratio of 3. Meanwhile, the frequency corresponding to the peak changes a little if the side ratio is less than 1, then the peak frequency decreases as the side ratio increases. Formulas for calculating the across-wind fluctuating loads are proposed through fitting to the experimental data as a function of side ratio.

引文

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