KSCE Journal of Civil and Environmental Engineering Research (대한토목학회논문집)

Korean Society of Civil Engeneers (대한토목학회)
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Permeability of Magnetic Flux of PS Steel for Variation of Stress and Temperature

긴장재의 응력 및 온도변화에 따른 자속투과율

  • 박진수 (경남대학교 사회기반시스템공학과) ;
  • 김병화 (경남대학교 건설시스템공학과)
  • Received : 2021.11.19
  • Accepted : 2022.02.07
  • Published : 2022.06.01
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Abstract

An experimental study was conducted to investigate the effect of applied tensile force and temperature on the permeability of magnetic flux in prestressing steel. The permeability of magnetic flux is the ratio at which the magnetic flux between two points passes. The prestressing steel used in these experiments included a 7-mm PS wire mainly used for cable-stayed bridges and a 12.7-mm PS strand for prestressed concrete bridges. The experiments to extract the permeability of the magnetic flux of steel wire and strand were conducted under various tensile levels and temperature conditions. From the experimental results, it was observed that the permeability of magnetic flux of the PS tension material was linearly proportional to the applied tensile stress level, and inversely proportional to the temperature. If the experimental relationship among the magnetic permeability, temperature, and prestressing ratio of a PS tension material is known in advance, the current tension stress level on PS members can be evaluated by measuring solely the magnetic permeability and temperature.

PS 긴장재의 긴장률, 온도 그리고 자속투과율의 상호관계가 실험적으로 조사되었다. 자속투과율은 두 지점 사이의 자속이 통과하는 비율이다. 실험에 사용된 긴장재는 케이블 교량에 주로 사용되는 ϕ7 mm 고강도 강선과 PSC 긴장재로 사용되는 ϕ12.7 mm 강연선이다. 다양한 도입 긴장률과 온도 조건하에서 강선과 강연선의 자속투과율 실험이 수행되었다. 실험결과로부터, PS 긴장재의 자속투과율은 도입 긴장률에 선형 비례하고, 온도에 선형 반비례함을 알 수 있다. PS 긴장재의 자속투과율-온도-긴장률 사의의 실험적 관계를 미리 알게 되면, 현장에서 PS 강재의 자속투과율과 온도만을 계측함으로써, PS 긴장재의 현재 긴장응력 수준을 변형률 계측 없이 직접 평가할 수 있다.

Keywords

Acknowledgement

이 연구는 한국연구재단(NRF-2018R1D1A1B07043521)의 지원을 받았습니다. 본 논문은 2021 CONVENTION 논문을 수정·보완하여 작성되었습니다

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