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Research Article

Evaluation of Fracture Elongation of Steel Reinforcement and Proposal for Gage Length Standard

철근의 파단 연신율 평가와 표점거리 표준 제안

Se-Rim Pyo1
,
Seung-Woo Lee2
,
Eun-Ho Lee3
,
Jae-Hoon Lee4*
표 세림1
,
이 승우2
,
이 은호3
,
이 재훈4*
1Engineer, Department of Bridge Engineering, COWI Korea, Seongnam 13595, Korea
2Engineer, Department of Bridge Engineering, DM Engineering, Seoul 05288, Korea
3Assistant Manager, Department of Structural Engineering, Dong Myeong Engineering Consultants, Hwaseong 02589, Korea
4Professor, Department of Civil Engineering, Yeungnam University, Gyeongsan 35841, Korea
1코비코리아 엔지니어
2디엠엔지니어링 엔지니어
3동명기술공단 대리문소속
4영남대학교 건설시스템공학과 교수
*Corresponding Author
31 December 2023. pp. 23-31
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Abstract

Tensile tests were carried out with steel reinforcing bars produced by the requirement of the ASTM standards, and test results of 23 test specimens were obtained that provided fracture elongation determined by KS, ISO, and ASTM standards. Strictness evaluation of fracture elongation was performed for each standard by analyzing a total data of 130 specimens, combining 107 specimens performed by previous researchers for reinforcing bars produced by the requirement of KS standards. The fracture elongation of general structural rebar was similarly strict in KS and ISO standards, and ASTM standards were considered less stringent. Although KS, ISO, and ASTM standards showed slightly different strictness in the fracture elongation requirement for seismic reinforcement, there was no significant difference. Since the necking length showed to be proportional to the reinforcing bar diameter, it might be reasonable to define the gauge length as a multiple of the reinforcing bar diameter. Therefore, it is believed that KS standards need to define a single multiple value of reinforcing bar diameter for the gauge length, and it may be an alternative to define the same regulations for minimum fracture elongation as ISO standards.

Keywords
steel reinforcing bar
fracture elongation
gauge length
necking distance
KS
ISO
ASTM standards

ASTM 표준에 만족하도록 생산된 철근으로 인장시험을 실시하여 KS, ISO, ASTM 표준에 따른 파단연신율을 모두 측정할 수 있게 파단 된 23개의 시험결과를 도출하였다. 이 시험결과와 선행연구자가 KS 표준에 준하여 생산된 철근을 대상으로 수행한 시험결과 107개를 합하여, 총 130개의 시험결과에 대한 분석으로 표준별 최소연신율 조건의 엄격성을 비교하였다. 일반구조용 철근의 파단연신율은 KS 표준과 ISO 표준이 유사하게 엄격하였고 ASTM 표준은 덜 엄격하다고 판단된다. 내진용 철근의 파단연신율은 KS, ISO, ASTM 표준이 엄격성에 다소 차이가 있지만 큰 차이를 보이지는 않았다. 네킹 길이는 대체적으로 철근 지름과 선형의 비례 관계가 있으므로, 파단연신율을 측정하기 위한 표점거리는 철근 지름의 배수로 규정하는 것이 합리적이라고 판단된다. 따라서 KS 표준은 표점 거리를 하나의 철근 지름 배수로 규정할 필요가 있으며, ISO 표준과 같이 철근 지름의 5배로 규정하고 이에 대한 최소 파단연신율을 규정하는 것이 대안이 될 것이다.

키워드
철근
파단연신율
표점거리
네킹 길이
KS 한국 표준
ISO 국제 표준
ASTM 미국 표준
References
1
ACI Committee 349 (2013) Code Requirements for Nuclear Safety-Related Concrete Structures (ACI 349-13) and Commentary. Farmington Hills, MI; American Concrete Institute (ACI).
2
ACI/ASME Technical Committee on Concrete Pressure Components for Nuclear Service (2007) Code for Concrete Containments (ACI 359-07), ASME Boiler and Vessel Pressure Code, Section III, division 2, Subsection CC-3900. New York, American Concrete Institute (ACI) and American Society of Mechanical Engineers (ASME).
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ASTM (2022a) Standard Specification for Deformed and Plain Carbon-Steel Bars for Concrete Reinforcement (ASTM A615/A615M), USA, American Society for Testing and Materials (ASTM)
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ASTM (2022b) Standard Specification for Low-Alloy Steel Deformed and Plain Bars for Concrete Reinforcement (ASTM A706/A706M), USA, American Society for Testing and Materials (ASTM)
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Lee, E. H., Kim, S. H., Park, M. S., and Lee, J. H. (2020) A Study on the Relationship Between Elongation of Reinforcement and Fracture of Flexural Members with Minimum Steel Ratio. Journal of the Conference of the Korea Concrete Institute, 183-184. (In Korean)
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Lee, J. H., Kim, D. H., and Choi, J. H. (2011) Evaluation of Minimum Extensibility Standard Requirements for Steel Reinforcement. Journal of the Korea Concrete Institute 23(5), 559-567. (In Korean) 10.4334/JKCI.2011.23.5.559
Information
  • Publisher :Korean Institute of Bridge and Structural Engineers
  • Publisher(Ko) :한국교량및구조공학회
  • Journal Title :Journal of Structure Research and Practice
  • Journal Title(Ko) :한국교량및구조공학회 논문집
  • Volume : 1
  • No :1
  • Pages :23-31
  • Received Date : 2023-11-30
  • Revised Date : 2023-12-01
  • Accepted Date : 2023-12-01
  • DOI :https://doi.org/10.22725/JSRP.2023.1.1.23
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