- Non-destructive method to investigate the hardness - plastic strain relationship in cyclically deformed structural steel elements
- H. Nashid ; W.G. Ferguson ; G.C. Clifton ; M. Hodgson ; M- Battley ; C. Seal ; J.H. Choi
- Book Title / Journal: New Zealand Society for Earthquake Engineering (NZSEE) Annual Technical Conference
- Year: 2014 , Volume: , Series:
- Structure types ; Steel structures ; Non Destructive Testing
- Keywords: steel elements ; non-destructive method
- Description
- A non-destructive hardness testing method is being developed to determine plastic strain in steel elements that have been subjected to inelastic seismic loading. The focus of this study is on the active links of eccentrically braced frames (EBFs). The 2010/2011 Christchurch earthquake series, especially the very intense February 22 shaking, was the first earthquake worldwide to push complete EBF systems into their inelastic state, generating a moderate to high level of plastic strain in EBF active links for a range of buildings from 3 to 23 storeys in height. Plastic deformation was confined to the active links. This raised two important questions: 1) what was the extent of plastic deformation; and 2) what effect does that have on post-earthquake steel properties? To answer these questions a range of actions are being taken. A non-destructive hardness test method is being developed to determine a relationship between hardness and plastic strain in active link beams. Active links from the earthquake affected, 23-storey Pacific Tower building in Christchurch has been hardness and material property tested to determine the changes in the steel, and cyclic testing of active links to defined levels of inelastic demand is underway. Test results to date show clear evidence that the hardness based method is able to give a good relationship between hardness measurements and plastic strain. This paper presents recent significant findings from this project. Principal of these is the discovery that hot rolled steel tested beams, all carry manufacturing induced plastic strains, in regions of the webs, of up to 5%. It is the intention of the overall research project, to establish a robust relationship between measured hardness and plastic strain demand in cyclically deformed steel elements and a comprehensive guideline to assess commonly used seismic-resisting systems will be adopted.
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- Evaluation of two novel NDT techniques: microdrilling of clay bricks and ground penetrating radar in masonry.
- Francisco Manuel Carvalho Pinto Fernandes
- Ph.D Thesis, Department of Civil Engineering, University of Minho.)
- Book Title / Journal:
- Year: 2006 , Volume: , Series:
- Non Destructive Testing
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- Non-destructive Testing for Plant Life Assessment
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- Training Course Series No. 26. International Atomic Energy Agency (IAEA), Vienna
- Book Title / Journal:
- Year: 2005 , Volume: , Series:
- Non Destructive Testing
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- Ultrasonic Examination of Concrete Structures
- A. Kovalev ; P. Shaw ; S. Hubbard
- Proceedings of the 8th ECNDT, European Conference on Nondestructive Testing Barcelona, Spain
- Book Title / Journal:
- Year: 2002 , Volume: , Series:
- Non Destructive Testing
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- Improper filled ducts detected by ultrasound reflection
- R. Jansohn ; J. Scherzer
- Proceedings of the 8th ECNDT, European Conference on Nondestructive Testing Barcelona, Spain
- Book Title / Journal:
- Year: 2002 , Volume: , Series:
- Non Destructive Testing
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- Statistical evaluation of ultrasound images of concrete structures
- O. Kroggel ; M. Schickert ; J. Schnapp
- Proceedings of the 8th ECNDT, European Conference on Nondestructive Testing Barcelona, Spain
- Book Title / Journal:
- Year: 2002 , Volume: , Series:
- Non Destructive Testing
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- Guidebook on non-destructive testing of concrete structures
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- Training Course Series No. 17. International Atomic Energy Agency (IAEA), Vienna
- Book Title / Journal:
- Year: 2002 , Volume: , Series:
- Non Destructive Testing
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- Guidebook for the Fabrication of Non-Destructive Testing (NDT) Test Specimens
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- Training Course Series No. 13. International Atomic Energy Agency (IAEA), Vienna
- Book Title / Journal:
- Year: 2001 , Volume: , Series:
- Non Destructive Testing
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- Objective Interpretation of Ultrasonic Concrete Images
- R. Jansohn ; M. Schickert
- Proceedings of the 7th ECNDT, European Conference on Nondestructive Testing Copenhagen
- Book Title / Journal:
- Year: 1998 , Volume: , Series:
- Non Destructive Testing
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