Experimental and numerical evaluation of wavelet based damage detection methodologies for civil infraestructure

dc.contributor.advisor Montejo Valencia, Luis A. Quiñones Fernández, Mireya M. College of Engineering en_US
dc.contributor.committee Suárez Colche, Luis E.
dc.contributor.committee Martínez Cruzado, José A.
dc.contributor.department Department of Civil Engineering en_US
dc.contributor.representative Lorenzo, Edgardo 2018-10-25T13:51:16Z 2018-10-25T13:51:16Z 2013
dc.description.abstract 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. en_US
dc.description.abstract Modelos a escala reducida de un puente de un solo vano, un puente tipo cercha de 12 bahías, y un modelo numérico de un edificio de corte fueron utilizados para evaluar la capacidad de las transformadas “Wavelet” para la identificación y detección de daño en estructuras con propiedades dinámicas transitorias. Las estructuras fueron excitadas utilizando un excitador estratégicamente localizado en el centro del claro de los puentes experimentales. El modelo numérico del edificio fue sujeto a excitaciones sísmicas. Para determinar las propiedades dinámicas del sistema, se realizaron pruebas experimentales de vibraciones libres y análisis de valores propios para los puentes experimentales y el modelo numérico, respectivamente. Pruebas dinámicas forzadas con excitación de ruido blanco (montajes experimentales) y excitaciones sísmicas (modelos numéricos) fueron realizadas con el fin de evaluar la capacidad de metodologías basadas en las transformadas “Wavelet” para la detección de daño en tiempo casi real. Las alteraciones (episodios de daño) a la respuesta del sistema son inducidas añadiendo y/o removiendo masas en las pruebas experimentales y reduciendo abruptamente la rigidez en el primer piso del modelo del edificio de corte. La Transformada Wavelet Continua se utilizó a frecuencias bajas para analizar la respuesta de las estructuras a las excitaciones y obtener razones de amortiguamiento promedio y detectar los cambios en las frecuencias naturales como función del tiempo. La Transformada Wavelet Discreta se utilizó para detectar singularidades en las frecuencias altas de la respuesta estructural que se puedan relacionar con los episodios de daño. en_US
dc.description.graduationSemester Fall en_US
dc.description.graduationYear 2013 en_US
dc.description.sponsorship This research was performed under an appointment to the U.S. Department of Homeland Security (DHS) Summer Research Team Program for Minority Serving Institutions, administered by the Oak Ridge Institute for Science and Education (ORISE) through an interagency agreement between the U.S. Department of Energy (DOE) and DHS. ORISE is managed by Oak Ridge Associated Universities (ORAU) under DOE contract number DE-AC05-06OR23100. All opinions expressed in this paper are the author’s and do not necessarily reflect the policies and views of DHS, DOE or ORAU/ORISE. Additional support was received from the Puerto Rico Strong Motion Program at the Civil Engineering Department of the University of Puerto Rico at Mayaguez. en_US
dc.language.iso en en_US
dc.rights.holder (c) 2013 Mireya Mercedes Quiñones Fernández en_US
dc.rights.license All rights reserved en_US
dc.subject Wavelet based damage detection en_US
dc.subject.lcsh Wavelets (Mathematics) en_US
dc.subject.lcsh Truss bridges en_US
dc.subject.lcsh Earthquake resistant design en_US
dc.title Experimental and numerical evaluation of wavelet based damage detection methodologies for civil infraestructure en_US
dc.type Thesis en_US
dspace.entity.type Publication Civil Engineering en_US M.S. en_US
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