Vibration Analysis Of Shanghai World Financial Center Under The Influence Of Typhoon

As an international metropolis,Shanghai is the center of China’s economy,trade,finance,shipping and transportation.More and more high-rise and super high-rise building structures appear in the field of construction.With the increase of building height,the stiffness of the structure decreases,the flexibility increases,and the natural frequency decreases.Therefore,the vibration analysis of the structure has become the focus of the whole design process,and the wind resistance design is the dominant factor in the design of super tall buildings.However,the dynamic characteristic parameters of the building structure can provide the main reference basis for the wind resistance design and structural parameter damage identification.Therefore,it is of great significance to study the wind-induced vibration response of super high-rise building structures.In recent years,more and more scholars in the world have been studying the field health monitoring,which has the advantages of safety,accuracy,convenience and realtime.Therefore,based on the structural vibration response of Shanghai World Financial Center under typical typhoons from 2018 to 2019,this paper studies the structural dynamic characteristic parameters of super-tall buildings,and mainly carries out the following work:(1)The traditional random decrement method(T-RDT)and the envelope random decrement method(E-RDT)were analyzed and compared through numerical experiments.The results show that the envelope random decrement method(E-RDT)is better than the traditional random decrement method(T-RDT).(2)the curve method,standard deviation method of the envelope of the random decrement method(E-RDT)and peak Picking method(Picking-Peaks)of the Shanghai world financial parameters of structural dynamic characteristics under different typhoon excitation amplitude correlation is studied,the identification results show that the natural frequency of the Shanghai world financial center are decreased with the increase of the amplitude and the damping ratio are increased with the increase of amplitude.And the dynamic characteristic parameters obtained by the three methods are similar.(3)The dynamic characteristic parameters of Shanghai World Financial Center under different typhoons are compared.The larger the acceleration amplitude is under different typhoons,the smaller the natural vibration frequency is and the larger the damping ratio is.(4)Through the analysis of the correlation between the dynamic characteristics and the wind speed under the influence of Typhoon "Lekima",it is found that the natural frequency is negatively correlated with the variation of the average wind speed,while the damping ratio is positively correlated with the variation of the average wind speed.(5)of the Shanghai world financial center by using the method of frequency domain of the modal identification,identification results show that the Shanghai world financial center in the different structure mode under the influence of the typhoon result basically the same,modal vibration mode increases with the increase of floor,and with the increase of modal order,present a nonlinear variation trend of more and more obvious.