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Open AccessArticle

A New Method for Internal Force Detection of Steel Bars Covered by Concrete Based on the Metal Magnetic Memory Effect

1
College of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China
2
Engineering Research Center of Bridge Structure and Material in the Mountainous Area of Ministry of Education and College of Materials Science and Engineering, Chongqing Jiaotong University, Chongqing 400074, China
3
Chongqing Yapai Bridge Engineering Quality Inspection Co., Ltd., Chongqing 401120, China
*
Author to whom correspondence should be addressed.
Metals 2019, 9(6), 661; https://doi.org/10.3390/met9060661
Received: 13 May 2019 / Revised: 30 May 2019 / Accepted: 4 June 2019 / Published: 6 June 2019
(This article belongs to the Special Issue Advances in Structural Steel Research)
In this paper, the specimens of steel bars covered by concrete (SBCC) are taken as research objects, and a new method for steel bar internal force detection based on the metal magnetic memory effect is proposed. The variation law of the self-magnetic flux leakage (SMFL) signals on the surfaces of SBCC specimens with loading tension and the variation of the SMFL signals along the axial positions of specimens under different tensile forces are studied. The results show that when the loading tension is about 90% of the yield tension, the tangential component of the SMFL signal has a maximum extreme point. The distribution of the SMFL signals along the axial position shows a smooth curve, where the values at both ends are small while the intermediate values are large. This paper also proposes the use of the “area ratio deviation parameter” to quantitatively calculate the internal forces of the steel bars. This parameter shows a significant linear relationship with the loading tension during the strengthening stage of the specimens. This method can supplement the existing steel bar stress detection methods and has prospective research value. View Full-Text
Keywords: metal magnetic memory; steel bar covered by concrete; stress nondestructive testing; strengthening stage metal magnetic memory; steel bar covered by concrete; stress nondestructive testing; strengthening stage
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MDPI and ACS Style

Pang, C.; Zhou, J.; Zhao, Q.; Zhao, R.; Chen, Z.; Zhou, Y. A New Method for Internal Force Detection of Steel Bars Covered by Concrete Based on the Metal Magnetic Memory Effect. Metals 2019, 9, 661.

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