Vibration Monitoring of a Steel-Plated Stress-Ribbon Footbridge: Uncertainties in the Modal Estimation

Soria Herrera, José Manuel and Muñoz Díaz, Iván and García Palacios, Jaime and Ibán, Norberto (2016). Vibration Monitoring of a Steel-Plated Stress-Ribbon Footbridge: Uncertainties in the Modal Estimation. "Journal of Bridge Engineering", v. 21 (n. 8); pp. 1-20. ISSN 1943-5592. https://doi.org/10.1061/(ASCE)BE.1943-5592.0000830.

Description

Title: Vibration Monitoring of a Steel-Plated Stress-Ribbon Footbridge: Uncertainties in the Modal Estimation
Author/s:
  • Soria Herrera, José Manuel
  • Muñoz Díaz, Iván
  • García Palacios, Jaime
  • Ibán, Norberto
Item Type: Article
Título de Revista/Publicación: Journal of Bridge Engineering
Date: August 2016
ISSN: 1943-5592
Volume: 21
Subjects:
Freetext Keywords: Footbridges, Continuous Dynamic Monitoring, Environmental Effects, Operational Modal Analysis
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 was developed and installed on an urban steel-plated stress-ribbon footbridge. The system continuously measures the acceleration [using 18 triaxial microelectromechanical system (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) was carried out to extract the modal parameters (i.e., the natural frequencies, damping ratios, and modal shapes). Thus, this study analyzed the time evolution of the modal parameters over data monitoring for 1 year. First, for similar environmental/ operational factors, the uncertainties associated with the SSI-based techniques used and to the acceleration records used were studied and quantified. Second, a methodology for tracking the vibration modes was established, because several of them with closely spaced natural frequencies were identified. Third, the modal parameters were correlated against external factors. It has been shown that this stress-ribbon structure is highly sensitive to temperature variations (frequency changes of more than 20%) with strongly seasonal and daily trends. Fairly simple dynamic multiple regression models for the lowest persistent vibration modes were derived, and excellent correlations for some of them were obtained. These correlations enable the influence of these uncertainties on modal estimates to be removed, thus facilitating their use as damage-sensitive features.

Funding Projects

TypeCodeAcronymLeaderTitle
Government of SpainBIA2011-28493-C01-01UnspecifiedAntolín Lorenzana IbánTécnicas experimentales y numéricas para la valoración del comportamiento vibratorio de pasarelas peatonales
Government of SpainIPT-2012-0703-380000UnspecifiedOctavio Nieto-Taladriz GarciaSETH: Sistema integral de monitorización estructural de edificios basado en tecnologías holísticas
Government of SpainDPI2013-47441-PUnspecifiedUnspecifiedDesarrollo de nuevos sistemas de reducción de vibraciones en estructuras peatonales

More information

Item ID: 56496
DC Identifier: http://oa.upm.es/56496/
OAI Identifier: oai:oa.upm.es:56496
DOI: 10.1061/(ASCE)BE.1943-5592.0000830
Official URL: https://ascelibrary.org/doi/10.1061/%28ASCE%29BE.1943-5592.0000830
Deposited by: Memoria Investigacion
Deposited on: 02 Mar 2020 16:47
Last Modified: 03 Mar 2020 07:07
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