【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.更多还原

【Abstract】 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.更多还原