18 August 2003 Automatic modal identification of cable-supported bridges instrumented with a long-term monitoring system
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Abstract
An automatic modal identification program is developed for continuous extraction of modal parameters of three cable-supported 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 cable-stayed 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.
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Y. Q. Ni, Y. Q. Ni, K. Q. Fan, K. Q. Fan, G. Zheng, G. Zheng, T. H. T. Chan, T. H. T. Chan, J. M. Ko, J. M. Ko, } "Automatic modal identification of cable-supported bridges instrumented with a long-term monitoring system", Proc. SPIE 5057, Smart Structures and Materials 2003: Smart Systems and Nondestructive Evaluation for Civil Infrastructures, (18 August 2003); doi: 10.1117/12.482379; https://doi.org/10.1117/12.482379
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