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http://dx.doi.org/10.12989/sem.2004.17.3_4.467

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)
Publication Information
Structural Engineering and Mechanics / v.17, no.3_4, 2004 , pp. 467-482 More about this Journal
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
damage identification; structural safety; prestressed concrete bridge; prestress-loss; modal test; natural frequency;
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