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Smart Structures and Systems
  Volume 6, Number 5, July-August 2010, pages 461-480
DOI: http://dx.doi.org/10.12989/sss.2010.6.5_6.461
 


Structural health monitoring of a cable-stayed bridge using wireless smart sensor technology: data analyses
Soojin Cho, Hongki Jo, Shinae Jang, Jongwoong Park, Hyung-Jo Jung, Chung-Bang Yun, Billie F. Spencer, Jr. and Ju-Won Seo

 
Abstract
    This paper analyses the data collected from the 2nd Jindo Bridge, a cable-stayed bridge in Korea that is a structural health monitoring (SHM) international test bed for advanced wireless smart sensors network (WSSN) technology. The SHM system consists of a total of 70 wireless smart sensor nodes deployed underneath of the deck, on the pylons, and on the cables to capture the vibration of the bridge excited by traffic and environmental loadings. Analysis of the data is performed in both the time and frequency domains. Modal properties of the bridge are identified using the frequency domain decomposition and the stochastic subspace identification methods based on the output-only measurements, and the results are compared with those obtained from a detailed finite element model. Tension forces for the 10 instrumented stay cables are also estimated from the ambient acceleration data and compared both with those from the initial design and with those obtained during two previous regular inspections. The results of the data analyses demonstrate that the WSSN-based SHM system performs effectively for this cable-stayed bridge, giving direct access to the physical status of the bridge.
 
Key Words
    wireless smart sensor network; cable-stayed bridge; structural health monitoring; modal identification; cable tension estimation.
 
Address
Soojin Cho; Department of Civil and Environmental Engineering, KAIST, 373-1 Guseong-dong, Yuseong-gu, Daejeon 305-701, South Korea
Hongki Jo and Shinae Jang; Department of Civil and Environmental Engineering, University of Illinois at Urbana-Champaign, 205 North Mathews Avenue, Urbana, IL 61801, USA
Jongwoong Park, Hyung-Jo Jung and Chung-Bang Yun; Department of Civil and Environmental Engineering, KAIST, 373-1 Guseong-dong, Yuseong-gu, Daejeon 305-701, South Korea
Billie F. Spencer, Jr.; Department of Civil and Environmental Engineering, University of Illinois at Urbana-Champaign, 205 North Mathews Avenue, Urbana, IL 61801, USA
Ju-Won Seo; Long Span Bridge Research Team, Hyundai Instititue of Construction Technology, 102-4 Mabook-dong, Giheung-gu, Yongin, Gyounggi-do 449-716, South Korea
 

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