This paper presents the application of the ambient vibration testing (AVT) and output-only modal analysis on a full-scale civil engineering structure. An empty permanent cantilever grandstand was subjected to AVT dynamic testing. Two complementary output-only modal analysis methods are implemented in the estimation of the modal parameters of the stand. They are the non-parametric technique based Enhanced Frequency Domain Decomposition (EFDD) method in frequency domain and more advanced Stochastic Subspace Identification (SSI) method in time domain. The results have shown that both techniques can identify the natural frequencies and damping ratios effectively. For validation purposes, the modal parameters estimated from the two EFDD and SSI were also compared to those estimated using conventional modal testing using shaker excitation. The agreement between both sets of results are shown to be very good.
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