All Issue

2015 Vol.28, Issue 6 Preview Page
Long Term Monitoring of Prestressing Tension Force in Post-Tension UHPC Bridge using Fiber Optical FBG Sensor

FBG 광섬유센서가 내장된 7연 강연선을 이용한포스트텐션 UHPC 교량의 긴장력 장기모니터링

Kim Hyun-Woo
,
Kim Jae-Min†*
,
Choi Song-Yi
,
Park Sung-Yong
,
Lee Hwan-Woo
Long Span Bridge Management Center
Department of Marine and Civil Engineering
Department of Civil and Environmental Engineering(Graduate School)
Division of Structural Engineering Research
Department of Civil Engineering

• 본 논문에 대한 토의를 2015년 12월 31일까지 학회로 보내주시면 2016년 2월호에 토론결과를 게재하겠습니다.

*Corresponding Author : jm4kim@jnu.ac.kr
2015. pp. 699-706
PDF XML Citation
Abstract

이 연구에서는 FBG센서가 내장된 강연선을 포스트텐션 UHPC 교량(길이 11.0m, 폭 5.0m, 높이 0.6m)에 적용하고 약 1년간의 긴장력 장기모니터링 결과를 정리하였다. 그리고 초기 도입 긴장력과 차량재하시험을 통하여 콘크리트 내부 강연선의 긴장력 변화를 계측하고 계측결과에 대한 분석을 수행하였다. 연구결과, 이 연구에서 제안하는 콘크리트 내부 긴장력 측정 방법이 공영 중인 교량에서 외력으로 인한 콘크리트 내부의 작은 프리스트레스 변화를 효과적으로 측정할 수 있음을 알 수 있었다. 아울러 장기 계측결과를 이용하여 응력변화에 의한 유효변형률을 정확하게 얻기 위해서는 온도보정에 사용되는 열팽창계수의 선택이 매우 중요함을 알 수 있었다.

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.

키워드
FBG센서, PSC 거더, 프리스트레스 강연선, 긴장력 모니터링, 온도보정
FBG sensor, PSC grider, prestressing strand, tension force monitoring, temperature compensation
References
1
S., Calvert and J., Mooney, 2004. Bridge Structural Health Monitoring System using Fiber Grating Sensors: Development and Preparation for a Permanent Installation. SPIE Proc., 5391, pp.61-71.
10.1117/12.541934
2
C.S., Hong, C.Y., Ryu, B.Y., Koo, C.G., Kim and S.H. , Yun, 2000. Strain Monitoring of Smart Bridge using Fiber Bragg Grating Sensor System with Wavelength-Swept Fiber Laser. SPIE Proc., 3988, pp.371-379.
10.1117/12.383157
3
Inaudi D. 2009Overview of 40 Bridge Structural Health Monitoring ProjectsInternational Bridge ConferenceIBC 2010.
4
S.T., Kim, Y.H., Park, Y.H, Park, K.H., Cho and J.R. , Cho, 2015. A Sensor-Type PC Strand with an Embedded FBG Sensor for Monitoring Prestress Forces. Sensors, 15, pp.1060-1070.
10.3390/s15010106025580903PMC4327064
5
Kim J.M Kim H.W. Park Y.H. Kim Y.S. 2010Tension Monitoring of a Prestressing Strand for Concrete Bridge using In-Tendon FBG SensorsProc. IABMAS-2010205210
10.1201/b10430-27
6
J.M., Kim, H.W., Kim, Y.H., Park, I.H., Yang and Y.S., Kim, 2012. FBG Sensors Encapsulated into 7-Wire Steel Strand for Tension Monitoring of a Prestressing Tendon. Adv. Struct. Eng., 15, pp.907-918.
10.1260/1369-4332.15.6.907
7
K.T., Lau, 2003. Fibre-Optic Sensors and Smart Composites for Concrete Applications,. Mag. Concr. Res., 55, pp.19-34.
10.1680/macr.55.1.19.37552
8
P.M., Nellen, R., Bronnimann, A., Frank, P., Mauron and U., Sennhauser, 1999. Structurally Embedded Fiber Bragg Gratings: Civil Engineering Application. SPIE Proc., 3860, pp.44-54.
10.1117/12.372954
9
R., Maaskant, T., Alavie, R.M., Measures, G., Tadros, S-H., Rizkalla and A., Guha-Thakurta, 1997. Fiber-Optic Bragg Grating Sensors for Bridge Monitoring. Cement and Concrete Composites, 19, pp.21-33.
10.1016/S0958-9465(96)00040-6
10
Othonos A. Kalli K. 1999Fiber Bragg GratingsArtech HouseLondon
11
Ren L. Li H.N. Sun L. Li D.S. 2005Development of Tube-Packaged FBG Strain Sensor and Application in the Vibration Experiment of Submarine Pipeline ModelSPIE Proc.981032810.1117/12.597596
10.1117/12.575224
12
R.C, Tennyson, A.A., Mufti, S., Rizkalla, G., Tadros and B., Benmokrane, 2001. Structural Health Monitoring of Innovative Bridges in Canada with Fiber Optic Sensors. Smart Mater. & Struct., 10, pp.1-22.
10.1088/0964-1726/10/3/320
13
Udd E. 1996Fiber Optic Smart StructuresJohn Wiley and Sons, Inc.
14
F.Z., Xuan, H., Tang and S.T., Tu, 2009. In Situ Monitoring on Prestress Losses in the Reinforced Structure with Fiber-Optic Sensors. Measurement, 42, pp.107-111.
10.1016/j.measurement.2008.04.011
15
Zhou Z. Zhang Z. Deng N. Zhao X. Li D Wang C. OU J. 2005Applications of FRP- OFBG Sensors on Bridge CablesSPIEProc.6686772810.1117/12.599823
16
Zhou Z. OU J. 2004Development of FBG Sensors for Structural Health Monitoring in Civil InfrastructuresSensing Issues in Civil Structural Health Monitoring197207
17
Z., Zhang, Z., Zhou, C., Wang and J., Ou, 2006. Long-Term Monitoring FBG-Based Cable Load Sensor. SPIE Proc., 6167, pp.1-7.
10.1117/12.659081
Information
  • Publisher :Computational Structural Engineering Institute of Korea
  • Publisher(Ko) :한국전산구조공학회
  • Journal Title :Journal of the Computational Structural Engineering Institute of Korea
  • Journal Title(Ko) :한국전산구조공학회 논문집
  • Volume : 28
  • No :6
  • Pages :699-706
  • Received Date : 2015-10-17
  • Revised Date : 2015-11-23
  • Accepted Date : 2015-11-24
  • DOI :https://doi.org/10.7734/COSEIK.2015.28.6.699
Journal Informaiton Journal of the Computational Structural Engineering Institute of Korea Journal of the Computational Structural Engineering Institute of Korea
Online Submission
  • NRF
  • KOFST
  • crossref crossmark
  • crossref cited-by
  • crosscheck
  • orcid
  • open access
  • ccl
Journal Informaiton Journal Informaiton - close