Quiñones Fernández, Mireya M.

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    Experimental and numerical evaluation of wavelet based damage detection methodologies for civil infraestructure
    (2013) Quiñones Fernández, Mireya M.; Montejo Valencia, Luis A.; College of Engineering; Suárez Colche, Luis E.; Martínez Cruzado, José A.; Department of Civil Engineering; Lorenzo, Edgardo
    Reduced scale models of a single span bridge, a 12 bay truss bridge, and a numerical model of a multi-story shear building were used to evaluate the capability of Wavelet Transforms for damage detection and system identification of structures with transient dynamic properties. The structures were excited using a shaker strategically located in the middle of the span for the experimental bridges. The numerical model of the building was subject to earthquake excitations. To determine the systems dynamic properties free decay tests and eigenvalue analyses were performed for the experimental bridges and numerical building, respectively. Forced dynamic tests using white noise excitation (experimental setups) and base accelerations (numerical models) were engaged to evaluate the capabilities of wavelet-based approaches for near-real time damage detection. The disturbances (damage episodes) in the dynamic response of the structure were induced by adding/removing masses from the experimental bridges and by suddenly reducing the first floor stiffness for the numerical model of the shear building. The Continuous Wavelet Transform was used at low frequencies to analyze the response of the structure to the excitation and obtain average damping ratios and real-time changes in the natural frequencies of vibration. The Discrete Wavelet transform was used to detect singularities in the high frequency response of the structure that can be related the occurrence of damage.