Abstract
This work aims to identify the dynamic parameters (i.e. natural frequencies and damping ratios) of a super tall building under construction (i.e., Tianjin 117 Tower). Real time kinematic - global navigation satellite system (RTK-GNSS) receivers are applied to monitor the vibration of the structure. Considering the errors of receivers, a joint denoising method is proposed to weaken the influence of noise. Meanwhile, random decrement method (RDM) and fast Fourier transform (FFT) are adopted to derive the dynamic parameters of the structure. Moreover, the identified results from field measurement are compared with predicted values obtained from finite element model (FEM) of the structure. The outcomes of this study are that: (1) the proposed joint denoising method can be employed to weaken the RTK-GNSS observation errors; (2) the first natural frequency of the structure is derived successfully based on FFT analysis, and it agrees well with the finite element results; (3) the damping ratio of the structure is obtained by using RDM.
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