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A Methodology for Monitoring Prestressed Force of Bridges Using OFS-embedded Stand  

Kim, Jae-Min (전남대학교 건설.환경공학부)
Kim, Hyun-Woo (전남대학교 건설.환경공학과)
Kim, Young-Sang (전남대학교 건설.환경공학부)
Kim, Jin-Won (전남대학교 건설.환경공학과)
Yun, Chung-Bang (KAIST 건설 및 환경공학과)
Publication Information
Journal of the Computational Structural Engineering Institute of Korea / v.21, no.3, 2008 , pp. 287-294 More about this Journal
Abstract
This study proposes a novel method for in service evaluation of tension force of a prestressed 7-wire strand which is frequently employed for retrofitting bridge superstructure. The smart strand is made by replacing the straight king wire of the strand with an instrumented steel tube in which the FBG sensor is embedded. Since the strain of the smart strand can easily be measured using the sensor, it is possible to monitor tension force of the strand during the service. For the sake of demonstrating effectiveness of the proposed strand, we came up with a 7.0m long prototype with 2 FBG sensors, and it is applied as an external tendon to a 6.4m long and 0.6 high RC T-shaped beam. A loading-unloading test has been carried out, and estimated tension forces using the smart strand are compared with measured forces by load cell. The comparison showed that the proposed smart tendon is useful and accurate for monitering tension force of the prestressed tendon.
Keywords
FEG sensor; smart strand; rc girder; in-service evaluation;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
연도 인용수 순위
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