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Long Term Monitoring of Prestressing Tension Force in Post-Tension UHPC Bridge using Fiber Optical FBG Sensor

FBG 광섬유센서가 내장된 7연 강연선을 이용한 포스트텐션 UHPC 교량의 긴장력 장기모니터링

  • Received : 2015.10.17
  • Accepted : 2015.11.24
  • Published : 2015.12.29

Abstract

This paper presents results of one-year monitoring on prestressing force of a 7-wire steel post-tensioning strand which is installed in a UHPC(ultra high performance concrete) bridge with 11.0 m long, 5.0 m wide, and 0.6 m high by using a FBG-encapsulated 7-wire steel strand. The initial prestressing forces and the prestress changes during a vehicle load test were measured using the FBG-encapsulated strand. The results show that the FBG-encapsulated 7-wire strand is very effective for monitoring the prestress forces even the change in the tension force is very small. Additionally, it was indicated that selection of the thermal expansion coefficient which is used for the temperature correction shall be carefully carried out.

Keywords

FBG sensor;PSC grider;prestressing strand;tension force monitoring;temperature compensation

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Cited by

  1. Fundamental Experiment to Verify the Resolution of Hetero-core Fiber Optic Sensor for the Prestress Measurement vol.31, pp.5, 2018, https://doi.org/10.7734/COSEIK.2018.31.5.259

Acknowledgement

Supported by : 국토교통과학기술진흥원, 한국건설기술연구원