Damage within a structure can be often inferred by comparing the modal properties identified from measurements with those obtained from a finite element (FE) model. Model updating aims to increase the accuracy and reliability of the FE model, which is essential for diagnosis and prognosis of the structure’s health. This paper summarizes the modal analysis and model updating studies conducted using the monitoring data obtained from 610m-tall Guangzhou Television and Sight Seeing Tower, which was established as an international benchmark problem by the Hong Kong Polytechnic University. Modal properties of the tower were successfully identified using frequency domain decomposition and stochastic subspace identification methods. A fair agreement of the modal properties obtained from the measurements and the FE model was found. FE model updating using the measurement data was further performed to reduce the modal property differences between the measurements and the FE model. Over-fitting during the FE model updating was avoided by using optimization with regularization schemes.
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