开洞超高层建筑的风致内压干扰效应

Interference effect of wind-induced internal pressure for super high-rise building with opening

为研究超高层建筑风致内压的干扰效应,在不同干扰工况下对一典型开洞超高层建筑进行了内压风洞试验。分析了不同截面宽度、不同高度施扰建筑干扰下的平均与峰值内压干扰因子的分布规律,并通过功率谱分析,研究了有、无干扰建筑时脉动内压的能量分布。结果表明:有、无干扰下的超高层建筑风致内压近似服从高斯分布;串列布置时,随着施扰建筑与受扰建筑的截面宽度比的增大,内压干扰因子逐渐减小;在并列布置且侧面开洞时,平均与峰值内压均呈放大效应,且干扰因子随着宽度比的增大而随之增加,峰值内压干扰因子最大值为1.33,此时若并列间距较小时,旋涡脱落共振峰值消失,但Helmholtz共振峰值能量会被大幅提高;当串列布置且施扰建筑高度与开洞所在高度相近时,侧面开洞受扰建筑的峰值内压始终被放大,峰值内压干扰因子最大值为1.12。

To investigate the interference effects of wind-induced internal pressure for super high-rise building, a series of wind tunnel experiments on internal pressures of a typical super high-rise building with opening were conducted in different interfered cases. The effects of breadth ratios and height ratios on the interference factors of mean and peak internal pressures were considered. Furthermore, energy distribution of fluctuating internal pressure was investigated by power spectra analyses at isolated or interfered cases. Results show that wind-induced internal pressure for building obeys the normal distribution at both isolated or interfered cases. Interference factor of internal pressure decreases with increased breadth ratio in tandem arrangement. However, the mean and peak internal pressures are always amplified in parallel arrangement when opening is perpendicular to approaching wind. The interference factor increases with increased breadth ratio, and the maximum interference factor of peak internal pressure is 1.33. The peak value induced by vortex shedding is disappeared while the energy of Helmholtz resonance peak is remarkably amplified when the parallel space between two buildings is small. The peak internal pressure is always amplified when the height of interfering building is close to that of opening on principal building in tandem arrangement, and the maximum interference factor is 1.12.