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


Autoria(s): Soria Herrera, José Manuel; Muñoz-Díaz, Iván; García-Palacios, Jaime H.; Ibán, Norberto; Lorenzana-Ibán, Antolín
Data(s)

2015

31/12/1969

Resumo

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

Formato

application/pdf

Identificador

http://oa.upm.es/38855/

Idioma(s)

eng

Publicador

E.T.S.I. Caminos, Canales y Puertos (UPM)

Relação

http://oa.upm.es/38855/1/INVE_MEM_2015_202390.pdf

http://congreso.us.es/cmmost/index.php/en/

IPT-2012-0703-380000

Direitos

http://creativecommons.org/licenses/by-nc-nd/3.0/es/

info:eu-repo/semantics/embargoedAccess

Fonte

Proceedings of the CMMoST 2015 | CMMoST 2015 | 24/06/2015 - 26/06/2015 | Sevilla, España

Palavras-Chave #Ingeniería Civil y de la Construcción #Mecánica
Tipo

info:eu-repo/semantics/conferenceObject

Ponencia en Congreso o Jornada

PeerReviewed