Identification of prestress-loss in PSC beams using modal information

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.
Publisher
TECHNO-PRESS
Issue Date
2004-03
Language
ENG
Keywords

DAMAGE IDENTIFICATION

Citation

STRUCTURAL ENGINEERING AND MECHANICS, v.17, pp.467 - 482

ISSN
1225-4568
URI
http://hdl.handle.net/10203/13832
Appears in Collection
NE-Journal Papers(저널논문)
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