Journal of the Earthquake Engineering Society of Korea (한국지진공학회논문집)

Earthquake Engineering Society of Korea (한국지진공학회)
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A Feasibility Study for Estimating Prestressed Stress on a Steel Wire Using Permeability of Magnetic Flux

자속투과율을 이용한 부착식 PSC 강선의 긴장응력 추정 타당성 연구

  • 김병화 (경남대학교 토목공학과) ;
  • 조창빈 (한국건설기술연구원) ;
  • 이도형 (배재대학교 건설환경철도공학과)
  • Received : 2013.06.10
  • Accepted : 2013.07.24
  • Published : 2013.09.02
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Abstract

This work examines the feasibility for estimating existing tensile stress on a stressed wire using the permeability of magnetic flux. A closed magnetic circuit has been constructed to induce magnetic flux inside a steel wire. With different tension stress levels on a wire, the permeability of magnetic flux on the wire has been measured. Two different experimental case studies have been conducted for the examination of sensitivity of permeability of magnetic flux on the stressed wire. One is a varying-length stress test, and the other is a fixed-length stress test. The results show that the permeability of magnetic flux in the varying-length stress test is inversely proportional to the applied stress, while the permeability in the fixed-length stress test is linearly proportional to the applied stress on the stressed wire. It is thus expected that the permeability of magnetic flux on a wire can be a promising indicator for the inspection of its tensile stress.

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References

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