Dynamic Analysis of Parameters of Shanghai Tower in Normal Wind and Typhoon

Abstract:

Based on the daily monitoring data from 2016 to 2017 and the data of typhoon “Ampil” in July 2018, the dynamic characteristics of Shanghai Tower were analyzed. The fundamental natural frequencies and damping ratios of Shanghai Tower were calculated by using the envelope random reduction method. The variations of dynamic parameters with vibration amplitude at low and high amplitudes were analyzed, respectively. The results show that the fundamental natural frequency of the structure decreases with the increase of vibration amplitude, and the fundamental damping ratio slightly increases with the increase of vibration amplitude. Furthermore, in typhoon “Ampil”, the fundamental natural frequency is still linear with vibration amplitude, and the relationship of the fundamental damping ratio and amplitude is nonlinear because of the influence of the damper. At the design stage, it is reasonable to set the structural damping ratio under normal service conditions and typhoon as 0.3% to 1.0% and 4%, respectively.