串列布置受扰超高层建筑脉动风压谱特性研究

基于刚性模型测压风洞试验，研究了方形高层建筑在单体和受扰状态下的脉动风压功率谱特性。在风洞中首先对C类地貌下的单体方形高层建筑进行了实验，然后针对16个不同施扰位置、3种不同高度比时的两方形高层建筑进行了干扰实验，得到了受扰方形高层建筑的局部风压。基于实验结果，研究了串列布置条件下间距比以及高度比对受扰建筑典型测点风压谱的影响。结果显示，单体建筑迎风面中轴线测点风压谱为宽频分布而棱边处风压谱出现尖锐谱峰；侧风面后缘高频段能量显著大于前缘。串列布置间距比变化时，典型测点谱峰幅值在间距比较小时显著削弱。较低施扰建筑导致的低频段能量较大，而较高施扰建筑主要影响高频段能量。 关键词：超高层建筑，风压谱，干扰效应，间距比，高度比

Interference Effects on Wind Pressure Spectra of Super-high-rise Buildings in Tandem Configurations

Based on wind tunnel tests of two square tall buildings, the characteristics of wind pressure spectra on the isolated and interfered building were investigated. Firstly experiments on a single square tall building in C terrain were carried out, then tests on the same building with 16 different locations and 3 different height ratios of an interfering building were conducted and wind pressures on the interfered building were obtained. In these foundations, the interference effects on wind pressure spectra of the typical taps of the interfered building were analyzed in frequency–domain with different spacing ratio and height ratio in tandem configurations. The results show that wind pressure spectra energy on the center line of the windward face of the isolated building is distributed over a wide frequency range; however, that near the edges on the face has sharp peaks. Energy at high reduced frequency near the trailing edges on the side face of the isolated building is significantly greater than that near the leading edges. The sharp peak amplitudes were dampened dramatically when the spacing ratio is small in tandem arrangements. The lower interfering building leads to larger energy at low reduced frequency, while the taller interfering building mainly affects the energy at high reduced frequency.