Abstract
In this paper, the effects of foundation damage and water-level change on vibration characteristics of gravity-type caisson structure are examined by analyzing modal parameters extracted from output-only information. To achieve the objective, the following approaches are implemented. Firstly, vibration response analysis methods are selected to estimate power spectral density and modal parameters such as natural frequency, damping ratio and mode shape of a lab-scale caisson structural system. Secondly, vibration tests on the lab-scale caisson system are performed under a series of test scenarios which include three water-level changes and three damage levels. Thirdly, experimental modal parameters corresponding to the damaging cases as well as the water level cases are extracted by frequency domain decomposition method and stochastic subspace identification method. Finally, the effects of the water-level variation and foundation damage on the extracted modal parameters are examined to assess the feasibility of the vibration-based damage detection in gravity-type caisson structures under water-level uncertainty.
Published Version
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