方形截面高层建筑间气动干扰对其驰振稳定性的影响

基于高频天平测力风洞试验技术,在4种模拟风场中对干扰建筑处于36个不同位置时方形截面超高层建筑的基底弯矩进行了测量,分析得到了驰振力系数和驰振临界风速,讨论了风场特性和干扰效应对它们的影响.研究结果表明,无周边建筑的干扰时,方形截面超高层建筑的驰振仅可能发生在风向与建筑体轴之间的夹角小于16°的情况,在有湍流的风场下,0°风向角附近时,发生驰振的可能性最大;当干扰建筑位于目标建筑上游正前方时,目标建筑的在0°风向角时的驰振可能性受到明显的抑制;在湍流风场下,干扰建筑仅处于少数干扰位置时会使目标建筑在0°风向角时的驰振不稳定性有所增大.

Influence of Aerodynamic Interference on High-rise Buildings with Square Sections on Its Galloping Stability

Based on high-frequency balance force wind tunnel tests, the base bending moments of a square-section super high-rise building with an adjacent building at 36 different locations were measured in 4 simulated turbulent wind fields, the galloping force coefficient is obtained by analysis, and the influence of wind field characteristics and interference effects on it is discussed. The test results show that the galloping of the square-section super high-rise buildings without interference building can only occur when the angle between the wind direction and the building body axis is less than 16°. And in the wind field with turbulence, the possibility of galloping near the 0° wind direction angle is the largest. When the interference building is directly in front of the upstream, the probability of galloping near the 0° wind direction angle is significantly reduced. In turbulent wind fields, the galloping instability near the 0° wind direction angle is increased only when interference building in few partial positions.