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Proceedings Paper

Vibration-based method to detect prestress loss in beam-type bridges
Author(s): Jeong-Tae Kim; Yeon-Sun Ryu; Chung-Bang Yun
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Paper Abstract

The loss of the prestress force is an uncertain parameter that may jeopardize the safety of PSC bridges. The prestress force is used to control crack formation in concrete, to reduce deflections, and to add strength to prestressed members; therefore, a substantial prestress-loss can lead to severe problems in the serviceability and safety of the PSC structures. A vibration-based method to detect prestress-loss in beam-type PSC bridges by monitoring changes in a few natural frequencies is presented. A SID (system identification) 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 identify the prestress-loss in the PSC bridges by using the changes in natural frequencies. The feasibility of the approach is evaluated using PSC beams for which a few natural frequencies are available for a set of prestress-loss cases.

Paper Details

Date Published: 18 August 2003
PDF: 10 pages
Proc. SPIE 5057, Smart Structures and Materials 2003: Smart Systems and Nondestructive Evaluation for Civil Infrastructures, (18 August 2003); doi: 10.1117/12.484638
Show Author Affiliations
Jeong-Tae Kim, Pukyong National Univ. (South Korea)
Yeon-Sun Ryu, Pukyong National Univ. (South Korea)
Chung-Bang Yun, Korea Advanced Institute of Science and Technology (South Korea)


Published in SPIE Proceedings Vol. 5057:
Smart Structures and Materials 2003: Smart Systems and Nondestructive Evaluation for Civil Infrastructures
Shih-Chi Liu, Editor(s)

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