Study on full-scale measurements of wind-induced response of the Shenzhen Kingkey 100 Tower

With the wireless accelerometers of model LAC-I, which were developed by the authors especially for full-scale measurements of wind-induced response of tall buildings, the acceleration of a super-tall building of 441.8 m, Shenzhen Kingkey 100 (KK100), was monitored continuously for over five years. The recorded data during four major typhoons from 2011 to 2015, including Nesat, Doksuri, Vicente and Usagi, combined with other data measured under normal weak wind and ambient excitation, were used to identify the dynamic parameter of KK100. Then the field measured data was compared with the results of wind tunnel test to verify the reliability of the wind tunnel test. It is found that the identified natural frequencies of the structure are almost the same for all cases, and the identified result is about 21% larger than the computational result based on the finite element modeling analysis provided by the structural design consultant at the design stage, whereas the identified damping ratios are relatively discrete, distributing at the range of 0.6% -0.9% in x-direction and 0.33%- 0.71% in y-direction. Moreover, the identified damping ratios have no obvious relationship with the vibration amplitudes. It is also found that under nearly the same wind circumstance, the results of full-scale measurements and wind tunnel test can match well. In the dominant across-wind direction, the peak acceleration response of wind tunnel test is 4.2% larger than that of full-scale measurements, which shows the reliability of wind tunnel test. Meanwhile, the maximum wind speed that is close to the 10-year return period wind speed in Shenzhen, has been observed in the past five years, however, the recorded maximum instantaneous acceleration of KK100 is just 0.123 m/s². The field measurement results show that the occupancy comfort requirement of the building can be well satisfied.