Verification of External Magnetization based EM Technique for Diagnosing Residual Tensile Stress in Aged PSC Structures

Soon-Jeon Park; Sehwan Park; Jaehoon Choi; Kyo-Young Jeon; Junkyeong Kim

doi:10.7734/COSEIK.2023.36.4.251

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2023 Vol.36, Issue 4 Preview Page Next Page

Research Paper

Verification of External Magnetization based EM Technique for Diagnosing Residual Tensile Stress in Aged PSC Structures 노후 PSC 구조물의 잔여 긴장 응력 진단을 위한 외부 자화 EM 기법 검증

31 August 2023. pp. 251-257

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Abstract

This study entailed an investigation of a tensile stress measurement method for prestressed concrete (PSC) tendons by utilizing external magnetization. The target of this study are PS structures that have been constructed and in use. An optimal external magnetization based elasto-magnetic (EM) sensor was designed using finite element analysis considering various factors, such as coil arrangement and size, that could influence the PS tendons inside the PSC girder. The residual tensile stress resulting from the external magnetization of the girder was then determined. Further, theoretical verification was performed using the numerical and material data used in the finite element analysis for sensor design. The calculated values of strength of magnetization at the target location were matched with the finite element analysis results. Thus, the designed sensor and the feasibility of magnetizing the tendons inside the PSC I-girder using an EM sensor were validated.

Keywords

PSC

EM sensor

element analysis

external magnetization

tendon

본 연구는 현재 가설되어 가용 중인 프리스트레스트 구조물에 대해서 긴장 응력을 계측하는 방법에 관한 연구를 위해 외부 자화를 이용한 PSC 텐던의 긴장 응력 계측에 관한 연구를 진행하였다. 이에 유한요소해석을 이용하여 PSC 거더에 외부 자화 시 잔존 긴장 응력을 검출하기 위해 PSC 거더 내부의 PS 텐던까지 영향을 줄 수 있는 코일 배치 및 크기 등을 고려하여 최적의 센서를 설계하였다. 또한, 유한요소해석을 이용하여 설계한 센서와 동일한 수치 및 재질 데이터를 이용해 이론적 검증을 진행하였으며 타겟 위치에서 자화의 세기를 계산하였을 때, 유한요소해석 결과와 동일한 결과를 얻어낼 수 있었다. 이를 통해 설계한 센서의 검증 및 비 접촉 외부 자화 EM 센서를 활용하여 PSC I형 거더 내부 텐던의 자화가 가능함을 확인하였다.

키워드

PSC

EM 센서

유한요소해석

외부자화

텐던

References

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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 : 36
No :4
Pages :251-257
Received Date : 2023-06-19
Revised Date : 2023-07-18
Accepted Date : 2023-07-18
DOI :https://doi.org/10.7734/COSEIK.2023.36.4.251

Journal of the Computational Structural Engineering Institute of Korea ISSN:1229-3059(Print) 2287-2302(Online) 한국전산구조공학회 논문집

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