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现场实测是获得结构风致振动动力特性参数的一种较为可靠的手段和方法。通过对厦门沿海某超高层建筑在台风登陆时进行现场原型实测,得到了该建筑结构的第10层、18层、23层、28层、33层和36层的加速度响应时程数据和固有频率及振型等结构的动力特性。根据实测加速度数据,利用随机减量法提取结构两方向的前3阶固有频率对应的阻尼比,结果表明:由于实测时台风风速较大,导致结构风致响应较为显著,因此结构两个方向第1阶阻尼比值在7%左右,明显大于另外两阶阻尼比;两方向第1阶阻尼比与加速度呈非线性关系,阻尼比随加速度的增大而增大。采用ANSYS软件建立该超高层建筑的3D有限元分析模型并进行模态分析,提取该模型的前3阶固有频率和振型,与实测结果进行对比分析,结果较为吻合,由此说明所建立的3D有限元分析模型正确可靠。
The field measurement is a reliable method and method to obtain the wind-induced vibration dynamic characteristic parameters. Through the field prototype test of a super high-rise building on the coast of Xiamen during the typhoon landing, the acceleration response time-history data and natural frequencies of the 10th, 18th, 23th, 28th, 33th and 36th floors of the building structure are obtained. And vibration mode and other dynamic characteristics of the structure. According to the measured acceleration data, the damping ratio corresponding to the first three natural frequencies in both directions of the structure is extracted by using the random decrement method. The results show that the response of the wind induced by the typhoon is larger, The damping ratio is about 7%, which is obviously higher than that of the other two damping ratios. The damping ratio of the first order in both directions is nonlinear with the acceleration, and the damping ratio increases with the acceleration. The ANSYS software is used to establish the 3D finite element analysis model of the super high-rise building and perform modal analysis. The first three natural frequencies and modes of the model are extracted and compared with the measured results. The results are in good agreement with each other, 3D finite element analysis model is correct and reliable.