Techno Press

Smart Structures and Systems   Volume 5, Number 1, January 2009, pages 81-94
Vibration and impedance monitoring for prestress-loss prediction in PSC girder bridges
Jeong-Tae Kim, Jae-Hyung Park, Dong-Soo Hong, Hyun-Man Cho, Won-Bae Na and Jin-Hak Yi

Abstract     [Full Text]
    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.
Key Words
    structural health monitoring; prestress-loss; vibration-based damage detection; PSC girder; vibration; electro-mechanical impedance; modal parameters.
Jeong-Tae Kim, Jae-Hyung Park, Dong-Soo Hong, Hyun-Man Cho and Won-Bae Na; Department of Ocean Engineering, Pukyong National University, Busan, Korea
Jin-Hak Yi; Korea Ocean Research & Development Institute, Ansan, Korea

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