相比于气动弹性模型风洞试验，强迫振动模型试验具有很强的参数可控性，是研究超高层建筑气动弹性效应的重要手段。然而，强迫振动装置的制造困难却限制了该方法的广泛应用。通过大涡模拟（Large Eddy Simulation, LES）方法对超高层建筑的强迫振动模型的气动力及流场进行了模拟，并基于此研究了超高层建筑的气动弹性效应。结果表明，该方法可较准确地模拟出超高层建筑强迫振动模型所受气动力及流场；当来流风速处于涡激共振风速区间时，横风向振幅的增加会显著加剧建筑侧面的旋涡脱落，使得其侧面风压及横风向气动力系数均方根值显著增大，而折减风速远离涡激共振风速时，横风向振动对建筑横风向气动力基本没有影响；振幅和折减风速的变化对建筑的横风向气动刚度和气动阻尼有显著的影响。
Abstract
Compared with aeroelastic model wind tunnel test, forced-vibration model test offers a high degree of controllability in terms of parameters and is a significant means to study the aeroelastic effects of super high-rise buildings. However, the manufacturing difficulties of forced-vibration devices limit the widespread application of this method. In this study, Large Eddy Simulation (LES) is used to simulate the forced-vibration model wind tunnel test of super high-rise buildings, in order to investigate their aeroelastic effects. The results show that the proposed method in this study can effectively simulate the aerodynamic forces and flow field of forced-vibration model for super high-rise buildings. When the incoming wind speed is within the range of vortex-induced resonance (VIR) speeds, the increase in cross-wind amplitude of super high-rise buildings will significantly aggravate the vortex shedding on the side of the structure, resulting in a obvious increase in the side wind pressure and the root mean square values of the lift coefficient. However, when the reduced wind speed is far above the VIR speed, the cross-wind vibration of the structure has a little impact on its aerodynamic forces. The changes of amplitude and reduced wind speed have significant effects on the cross-wind aerodynamic stiffness and aerodynamic damping of buildings.
关键词
大涡模拟 /
超高层建筑 /
强迫振动 /
气动弹性效应
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Key words
Large eddy simulation /
super high-rise building /
forced-vibration /
aeroelastic effects
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