在风洞中采用同步测压技术研究了超高层建筑在受到周边建筑干扰后的风压变化,分析了不同宽度比Br和高度比Hr的两个高层建筑在不同相对布置下的相互干扰对风压的影响.结果显示：当施扰建筑位于横风向间距为2倍的受扰建筑迎风宽度的迎风区域内时,其对结构立面平均风压基本呈现遮挡效应,且一般情况下,Br和Hr越大,遮挡效应越明显;但当施扰建筑和受扰建筑串列间距较小且Hr〈1时,产生的三维绕流现象可使迎风面局部平均风压升高25%,侧面局部风压升高56%;并列布置时的峡谷效应是导致受扰建筑风压显著增大的主要原因;在并列布置中观测到的最大干扰因子为2.6且随间距的增大而减少,当间距超过受扰建筑宽度的8倍时峡谷效应才趋于消失.由实验结果回归得到的并列布置时的侧立面最大平均风压干扰因子随并列间距比变化的关系式精确度可达99%.

 The variation of wind pressure on a super-tall building under the interference of nearby buildings was measured by a series of wind tunnel tests by means of the synchronous pressure measurement technique,and the interference effects of two tall buildings with different breadth ratio Br and height ratio Hr on the wind pressure were analyzed.The results show that (1) the interfering building usually causes obvious shielding effect on the principal building when it is placed in the windward area with an across-wind-direction spacing less than twice the breadth of the principal building,and,generally,wider and higher interfering building may cause more significant shielding effects;（2） due to the three-dimension flow effects,lower upstream interfering buildings（Hr1） in tandem arrangement may increase the local mean wind pressure on the windward and the lateral face by 25% and 56%,respectively;（3） the channeling effect in side-by-side arrangement is the main reason for the wind pressure increase;（4） the maximum interference factor of the wind pressure on the lateral face is found to be 2.6 in side-by-side arrangement and decreases with the increase of building spacing;and（5） the channeling effect tends to disappear only when the building spacing exceeds eight times the breadth of the principal building.In addition,a credible regression equation with the accuracy of 99% for two side-by-side arranged buildings is proposed to predict the maximum interference factor of the mean wind pressure on the lateral face.