基于刚性模型测压风洞试验的武汉国际证券大厦三维风致响应分析

INVESTIGATION ON WIND-INDUCED 3-D RESPONSES OF WUHAN INTERNATIONAL STOCK BUILDING BASED ON WIND TUNNEL TESTS OF RIGID MODELS

武汉国际证券大厦为典型钢结构超高层建筑,对风荷载十分敏感。基于刚性模型表面测压风洞试验,得到了武汉国际证券大厦的表面风压时程,在此基础上,通过数据处理建立了三维频域风荷载模型,进而采用随机振动理论,计算得到该大厦两个水平主轴向和扭转向的最大位移和加速度响应,并进一步分析了大厦加速度和位移响应的变化规律。最后,系统分析了在不同重现期风速作用下,武汉国际证券大厦的抗风设计指标,为结构工程师进行结构抗风设计提供必要的参考。

Wuhan international stock building is a typical steel super high-rise building which is very sensitive to wind loads. Based on wind tunnel tests of rigid model, the surface wind pressure time series of Wuhan international stock building were obtained, and then, the 3-D wind load model of the building in frequency domain was established through data processing. Furthermore, the maximum displacement and acceleration responses in the two horizontal principle axial directions and the torsional direction were evaluated based on random vibration theory. In the meantime, the variation of the building＇s displacement and acceleration responses was investigated. Finally, the indexes of wind resistant design of Wuhan international stock building, which are valuable references for structural engineer, were analyzed systematically under the maximum wind speed at different return periods.