气动弹性效应对超高层建筑横风向动力干扰效应的影响

Influence of aeroelastic effect on the crosswind-induced interference effect of super high-rise buildings

基于一系列方形截面超高层建筑气动弹性模型测振风洞试验和刚性模型高频天平测力风洞试验,分析了不同折减风速下外形相同的另一个邻近超高层建筑对目标建筑的横风向风致响应的干扰效应,探讨了气动弹性效应对不同折减风速下的干扰因子和一定风速范围内包络干扰因子的影响。结合典型工况下气动阻尼比和加速度响应均方根值随折减风速的变化曲线讨论了气动弹性效应对干扰效应的影响机理。结果表明:在近距离斜上游以及正下游干扰位置附近工况下,气动弹性效应放大了受扰建筑在高折减风速下的干扰因子和包络干扰因子;在来流风速小于涡激共振临界风速时,忽略气动弹性效应一般会使包络干扰因子计算值偏于保守。

Based on a series of wind tunnel tests on aeroelastic models and high-frequency force balance rigid models of square-section super high-rise buildings,the interference effect of another neighboring identical building on the crosswind response of a super high-rise building at different reduced wind speed was analyzed,and the influences of aeroelastic effect on the interference factor at different reduced wind speed and envelope interference factor at a range of reduced wind speed were evaluated.The mechanism of aeroelastic effect acting on the interference effect was discussed with the aerodynamic damping ratio curves and acceleration response RMS value curves in selected typical model cases.The results show that:the aeroelastic effect enlarges the interference factor and the envelope interference factor at high reduced wind speed;the calculated envelope interference factor at the approaching wind speed lower than the vortex-resonance critical speed is somewhat conservative when the aeroelastic effect is neglected.