Structural Engineering and Mechanics

Techno-Press (테크노프레스)
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Identification of prestress-loss in PSC beams using modal information

  • Kim, Jeong-Tae (Smart Structure Engineering Laboratory, Department of Ocean Engineering, Pukyong National University) ;
  • Yun, Chung-Bang (Department of Civil and Environmental Engineering, KAIST) ;
  • Ryu, Yeon-Sun (Department of Ocean Engineering, Pukyong National University) ;
  • Cho, Hyun-Man (Department of Ocean Engineering, Pukyong National University)
  • Received : 2003.02.04
  • Accepted : 2003.11.06
  • Published : 2004.03.25
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Abstract

One of the uncertain damage parameters to jeopardize the safety of existing PSC bridges is the loss of the prestress force. A substantial prestress-loss can lead to severe problems in the serviceability and safety of the PSC bridges. In this paper, a nondestructive method to detect prestress-loss in beam-type PSC bridges using a few natural frequencies is presented. An analytical model is formulated to estimate changes in natural frequencies of the PSC bridges under various prestress forces. Also, an inverse-solution algorithm is proposed to detect the prestress-loss by measuring the changes in natural frequencies. The feasibility of the proposed approach is evaluated using PSC beams for which a few natural frequencies were experimentally measured for a set of prestress-loss cases. Numerical models of two-span continuous PSC beams are also examined to verify that the proposed algorithm works on more complicated cases.

Keywords

References

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