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

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

Description

Title: A procedure to track vibration modes under changing external factors: application to a pedestrian bridge
Author/s:
  • Soria Herrera, José Manuel
  • Muñoz-Díaz, Iván
  • García-Palacios, Jaime H.
  • Ibán, Norberto
  • Lorenzana-Ibán, Antolín
Item Type: Presentation at Congress or Conference (Article)
Event Title: CMMoST 2015
Event Dates: 24/06/2015 - 26/06/2015
Event Location: Sevilla, España
Title of Book: Proceedings of the CMMoST 2015
Date: 2015
Subjects:
Freetext Keywords: Modal analysis; Footbridge; Continuous dynamic monitoring; Environmental effects
Faculty: E.T.S.I. Caminos, Canales y Puertos (UPM)
Department: Mecánica de Medios Continuos y Teoría de Estructuras
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

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

Funding Projects

TypeCodeAcronymLeaderTitle
Government of SpainIPT-2012-0703-380000INNPACTO-SETHUnspecifiedUnspecified

More information

Item ID: 38855
DC Identifier: http://oa.upm.es/38855/
OAI Identifier: oai:oa.upm.es:38855
Official URL: http://congreso.us.es/cmmost/index.php/en/
Deposited by: Memoria Investigacion
Deposited on: 26 Jan 2016 18:32
Last Modified: 01 Dec 2016 23:30
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