Wind field characteristic and wind-induced vibration analysis of litong plaza under typhoon effect

The simultaneous field measurement of wind speed,wind direction and wind-induced acceleration response were conducted on the super tall building of Litong plaza in Guangzhou when typhoon Vicente affected the building.The wind filed characteristics at the top of the building were obtained through statistical analysis.The frequencyspectrum characteristics of wind-induced responses and the dynamic characteristics were identified from the measured wind-induced acceleration data.The nonlinear damping ratio was also obtained by using the random decrement technique.On the other hand the displacements at the top of the building were previously measured by GPS system under ambient condition.The multi-path effect of the measured displacement was investigated and the removing method was studied.The natural frequencies obtained by different methods were compared.The effectiveness of the identified natural frequencies was therefore verified by the compared results.