高层建筑物气动弹性模型风洞试验研究

本文主要研究了一高层建筑物气动弹性模型的动态响应特性。模拟对象为上海市的新锦江饭店。该建筑物高155.94米,长和宽均为32米,全钢结构。试验是在中国空气动力研究与发展中心低速所的1.4米×1.4米风洞中进行的。通过风洞试验,得到了该建筑物上的脉动压力、振动加速度和总体气动载荷。采用 SD-375动态分析仪进行了频谱分析和其它数学处理,获得了相应的统计函数。试验结果表明,不管风向如何,建筑物的最大动态响应总是与折算风速的幂成正比,对该模型来说,在风速相同时,横风响应值大于其它方向,设计时应予以考虑,从功率谱密度函数来看,其振动能量主要集中在建筑物的最低阶频率附近,高阶振型的影响可以忽略。

THE EXPERIMENTAL INVESTIGATION OF A HIGHRISE BUILDING AEROELASTIC MODEL

The high building dynamic response in strong wind bringsnuisance to the occupants and causes fatigue failure to the structure.It is essential for designer to understand the dynamic response of thebuilding.As there is no theoretical way to assess the dynamic response,the model test is necessary.Jing Jiang New Hotel in Shanghai is a steel structure high-rise building.The plane form of the building is 32m by 32m and height of 155.94m.Here is presented the experiment investigation of the high-rise buildingaeroelastic model.This test is conducted in the Low Speed Wind Tunnel of China Aero-dynamic Research and Development Center(CARDC),which is an opencircuit tunnel.The cross section area of the test section is 1.92 m~2.The fluctuating pressure,the vibration acceleration and the total aero-dynamic load were obtained from the wind tunnel test.It can be seenfrom the results that the maximum dynamic response of the building isproportional directly to the power of the reduced wind speed regard-less of the wind directions.The cross-wind response more significantthan those in other directions at the same wind speed,which shouldbe taken into account in the building design.From the power spectraldensity,it is found that the vibration energy is mainly centered a-round the minimum frequence,and the influence of the higher vibrationmode can be ignored