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Smart Structures and Systems
  Volume 17, Number 3, March 2016, pages 391-411
DOI: https://doi.org/10.12989/sss.2016.17.3.391
 


Mode identifiability of a multi-span cable-stayed bridge utilizing stabilization diagram and singular values
Y. Goi and C.W. Kim

 
Abstract
    This study investigates the mode identifiability of a multi-span cable-stayed bridge in terms of a benchmark study using stabilization diagrams of a system model identified using stochastic subspace identification (SSI). Cumulative contribution ratios (CCRs) estimated from singular values of system models under different wind conditions were also considered. Observations revealed that wind speed might influence the mode identifiability of a specific mode of a cable-stayed bridge. Moreover the cumulative contribution ratio showed that the time histories monitored during strong winds, such as those of a typhoon, can be modeled with less system order than under weak winds. The blind data Acc 1 and Acc 2 were categorized as data obtained under a typhoon. Blind data Acc 3 and Acc 4 were categorized as data obtained under wind conditions of critical wind speeds around 7.5 m/s. Finally, blind data Acc 5 and Acc 6 were categorized as data measured under weak wind conditions.
 
Key Words
    benchmark study; cable-stayed bridge; cumulative contribution ratio; operational modal identification
 
Address
Y. Goi and C.W. Kim:Department of Civil and Earth Resources Engineering, Kyoto University, Kyoto 615-8540, Japan
 

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