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Automatic modal identification of cable-supported bridges instrumented with a long-term monitoring system

Ni, Yi-Qing, Fan, K.Q., Zheng, G., Chan, Tommy H.T., & Ko, Jan Ming (2003) Automatic modal identification of cable-supported bridges instrumented with a long-term monitoring system. In Liu, S.C. (Ed.) Smart Structures and Materials 2003: Smart Systems and Nondestructive Evaluation for Civil Infrastructures, August 2003.

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Abstract

An automatic modal identification program is developed for continuous extraction of modal parameters of three cablesupported bridges in Hong Kong which are instrumented with a long-term monitoring system. The program employs the Complex Modal Indication Function (CMIF) algorithm to identify modal properties from continuous ambient vibration measurements in an on-line manner. By using the LabVIEW graphical programming language, the software realizes the algorithm in Virtual Instrument (VI) style. The applicability and implementation issues of the developed software are demonstrated by using one-year measurement data acquired from 67 channels of accelerometers deployed on the cablestayed Ting Kau Bridge. With the continuously identified results, normal variability of modal vectors caused by varying environmental and operational conditions is observed. Such observation is very helpful for selection of appropriate measured modal vectors for structural health monitoring applications.

Impact and interest:

3 citations in Scopus
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4 citations in Web of Science®

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ID Code: 12784
Item Type: Conference Paper
Keywords: automatic modal identification, complex modal indication function, modal vector, environmental variability
DOI: 10.1117/12.482379
Subjects: Australian and New Zealand Standard Research Classification > TECHNOLOGY (100000)
Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > CIVIL ENGINEERING (090500)
Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > CIVIL ENGINEERING (090500) > Structural Engineering (090506)
Divisions: Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering
Past > Schools > School of Urban Development
Copyright Owner: Copyright 2003 International Society for Optical Engineering (SPIE)
Copyright Statement: Reproduced in accordance with the copyright policy of the publisher.
Deposited On: 04 Mar 2008
Last Modified: 29 Feb 2012 23:53

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