A procedure to track vibration modes under changing external factors: application to a pedestrian bridge

Soria Herrera, José Manuel; Muñoz-Díaz, Iván; García-Palacios, Jaime H.; Ibán, Norberto y Lorenzana-Ibán, Antolín (2015). A procedure to track vibration modes under changing external factors: application to a pedestrian bridge. En: "CMMoST 2015", 24/06/2015 - 26/06/2015, Sevilla, España. pp. 1-17.

Descripción

Título: A procedure to track vibration modes under changing external factors: application to a pedestrian bridge
Autor/es:
  • Soria Herrera, José Manuel
  • Muñoz-Díaz, Iván
  • García-Palacios, Jaime H.
  • Ibán, Norberto
  • Lorenzana-Ibán, Antolín
Tipo de Documento: Ponencia en Congreso o Jornada (Artículo)
Título del Evento: CMMoST 2015
Fechas del Evento: 24/06/2015 - 26/06/2015
Lugar del Evento: Sevilla, España
Título del Libro: Proceedings of the CMMoST 2015
Fecha: 2015
Materias:
Palabras Clave Informales: Modal analysis; Footbridge; Continuous dynamic monitoring; Environmental effects
Escuela: E.T.S.I. Caminos, Canales y Puertos (UPM)
Departamento: Mecánica de Medios Continuos y Teoría de Estructuras
Licencias Creative Commons: Reconocimiento - Sin obra derivada - No comercial

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Resumen

A low-cost vibration monitoring system has been developed and installed on an urban steel- plated stress-ribbon footbridge. The system continuously measures: the acceleration (using 18 triaxial MEMS accelerometers distributed along the structure), the ambient temperature and the wind velocity and direction. Automated output-only modal parameter estimation based on the Stochastic Subspace Identification (SSI) is carried out in order to extract the modal parameters, i.e., the natural frequencies, damping ratios and modal shapes. Thus, this paper analyzes the time evolution of the modal parameters over a whole-year data monitoring. Firstly, for similar environmental/operational factors, the uncertainties associated to the time window size used are studied and quantified. Secondly, a methodology to track the vibration modes has been established since several of them with closely-spaced natural frequencies are identified. Thirdly, the modal parameters have been correlated against external factors. It has been shown that this stress-ribbon structure is highly sensitive to temperature variation (frequency changes of more than 20%) with strongly seasonal and daily trends

Proyectos asociados

TipoCódigoAcrónimoResponsableTítulo
Gobierno de EspañaIPT-2012-0703-380000INNPACTO-SETHSin especificarSin especificar

Más información

ID de Registro: 38855
Identificador DC: http://oa.upm.es/38855/
Identificador OAI: oai:oa.upm.es:38855
URL Oficial: http://congreso.us.es/cmmost/index.php/en/
Depositado por: Memoria Investigacion
Depositado el: 26 Ene 2016 18:32
Ultima Modificación: 01 Dic 2016 23:30
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