Ponencia
Modal identification of a pedestrian bridge by output-only analysis
Autor/es | Galvín, Pedro
Domínguez Abascal, José |
Departamento | Universidad de Sevilla. Departamento de Mecánica de Medios Continuos y Teoría de Estructuras |
Fecha de publicación | 2005 |
Fecha de depósito | 2017-02-08 |
Publicado en |
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Resumen | The modal parameters (natural frequencies, mode shapes and damping ratios) describe the dynamic properties of a mechanical system. The classical modal analysis, based on Frequency Response Function, require measurements ... The modal parameters (natural frequencies, mode shapes and damping ratios) describe the dynamic properties of a mechanical system. The classical modal analysis, based on Frequency Response Function, require measurements of both the input force and the response. Normally, it is very difficult to measure the excitation on large structures (bridges, tall buildings, offshore platforms, etc.). However, reasonable estimates of the modal parameters can be extracted from ambient vibration or output-only response (wind, traffic, humans, etc.). The dynamic behaviour of a curved pedestrian bridge in the University of Seville (Spain) has been investigated by full-scale testing and theoretical models. Nine vibration modes have been identified in the frequency range of 0-20 Hz, by the following algorithms: Enhanced Frequency Domain Decomposition (EFDD) and Stochastic Subspace Identification (SSI). Ambient modal parameters estimation have been compared with a rigorous three-dimensional finite element model, showed very good agreement. |
Agencias financiadoras | Ministerio de Educación y Ciencia (MEC). España |
Identificador del proyecto | DPI2001-2377-C02-01
BIA2004- 03955-C02-01 |
Cita | Galvín, P. y Domínguez Abascal, J. (2005). Modal identification of a pedestrian bridge by output-only analysis. En 23th Conference and Exposition on Structural Dynamics 2005 (IMAC - XXIII) Orlando, USA: Society for Experimental Mechanics (SEM). |
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