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Smart Structures and Systems
  Volume 6, Number 5, July-August 2010, pages 505-524
DOI: http://dx.doi.org/10.12989/sss.2010.6.5_6.505
 


Rapid-to-deploy reconfigurable wireless structural monitoring systems using extended-range wireless sensors
Junhee Kim, R. Andrew Swartz, Jerome P. Lynch, Jong-Jae Lee and Chang-Geun Lee

 
Abstract
    Wireless structural monitoring systems consist of networks of wireless sensors installed to record the loading environment and corresponding response of large-scale civil structures. Wireless monitoring systems are desirable because they eliminate the need for costly and labor intensive installation of coaxial wiring in a structure. However, another advantageous characteristic of wireless sensors is their installation modularity. For example, wireless sensors can be easily and rapidly removed and reinstalled in new locations on a structure if the need arises. In this study, the reconfiguration of a rapid-to-deploy wireless structural monitoring system is proposed for monitoring short- and medium-span highway bridges. Narada wireless sensor nodes using power amplified radios are adopted to achieve long communication ranges. A network of twenty Narada wireless sensors is installed on the Yeondae Bridge (Korea) to measure the global response of the bridge to controlled truck loadings. To attain acceleration measurements in a large number of locations on the bridge, the wireless monitoring system is installed three times, with each installation concentrating sensors in one localized area of the bridge. Analysis of measurement data after installation of the three monitoring system configurations leads to reliable estimation of the bridge modal properties, including mode shapes.
 
Key Words
    structural monitoring; wireless sensors; modal analysis; smart structures.
 
Address
Junhee Kim; Department of Civil and Environmental Engineering, University of Michigan, 2350 Hayward Street, 2380 G. G. Brown Building, Ann Arbor, MI 48109-2125, USA
Andrew Swartz; Department of Civil and Environmental Engineering, Michigan Technological University, Houghton, MI 49931, USA
Jerome P. Lynch; Department of Civil and Environmental Engineering, University of Michigan, 2350 Hayward Street, 2380 G. G. Brown Building, Ann Arbor, MI 48109-2125, USA
Jong-Jae Lee; Department of Civil and Environmental Engineering, Sejong University, 98 Gunja-dong, Gwangjin-gu, Seoul 143-747, Korea
Chang-Geun Lee; Structural Research Team, Expressway and Transportation Research Institute, Korea Expressway Corporation, 50-5 Sencheok-ri, Dongtan-myeon, Hwaseong-si, Gyenggi-do 445-812, Korea
 

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