Smart Structures and Systems

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Vibration and impedance monitoring for prestress-loss prediction in PSC girder bridges

  • Kim, Jeong-Tae (Department of Ocean Engineering, Pukyong National University) ;
  • Park, Jae-Hyung (Department of Ocean Engineering, Pukyong National University) ;
  • Hong, Dong-Soo (Department of Ocean Engineering, Pukyong National University) ;
  • Cho, Hyun-Man (Department of Ocean Engineering, Pukyong National University) ;
  • Na, Won-Bae (Department of Ocean Engineering, Pukyong National University) ;
  • Yi, Jin-Hak (Korea Ocean Research & Development Institute)
  • Received : 2007.11.07
  • Accepted : 2008.07.30
  • Published : 2009.01.25
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Abstract

A vibration-impedance-based monitoring method is proposed to predict the loss of prestress forces in prestressed concrete (PSC) girder bridges. Firstly, a global damage alarming algorithm using the change in frequency responses is formulated to detect the occurrence of damage in PSC girders. Secondly, a local damage detection algorithm using the change in electro-mechanical impedance features is selected to identify the prestress-loss in tendon and anchoring members. Thirdly, a prestress-loss prediction algorithm using the change in natural frequencies is selected to estimate the extent of prestress-loss in PSC girders. Finally, the feasibility of the proposed method is experimentally evaluated on a scaled PSC girder model for which acceleration responses and electro-mechanical impedances were measured for several damage scenarios of prestress-loss.

Keywords

References

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