Operational modal analysis for the Guangzhou new TV tower

Abstract

The 610 m high Guangzhou New TV Tower (GNTVT) is currently considered as a benchmark problem for structural health monitoring research. In the benchmark study task I, a set of 24-hour ambient vibration measurement data is available for output-only system identification and FE model updating. In this contribution, an Operational Modal Analysis (OMA) for GNTVT is performed using the Vector AutoRegressive models (ARV) method. The extracted eigenfrequencies, damping ratios and mode shapes are presented and compared with the result obtained using the Stochastic Subspace Identification (SSI) method. Furthermore, results from some other benchmark testing groups are used for comparison. This study shows that the ARV-based method works successfully for this OMA purpose.