DOI QR코드

DOI QR Code

Initial Imperfection and Axial Strength of Struts with Octagonal Hollow Section fabricated from HR Plate

열연강판 팔각강관 버팀보의 초기편심과 축방향 압축강도

  • 조재병 (경기대학교, 토목공학과)
  • Received : 2014.02.17
  • Accepted : 2014.09.30
  • Published : 2015.02.27

Abstract

Developed in this study were Octagonal-hollow-section(OHS) struts, whose compressive strengths against flexural and local buckling is higher than H-shape or rectangular-hollow-section(RHS) struts with the same unit weight. OHS members are also advantageous in handling and storing compared to circular hollow sections(CHS). OHS members were fabricated from HR Plates by cold forming and fillet welding. 5 numbers of 20m long OHS struts were assembled, each of which consist of two 9.6m long OHS member and two end connection elements made of cast iron. The compressive strength of the OHS strut was evaluated by comparing the test results, design codes and FEM analysis each other. Test results show that all of the struts have almost same or larger compressive strength than Korean Road Bridge Design Code(KRBDC) (2012). The initial imperfections can be estimated by using measured strains and are turned out to be less than L/450 for all the struts tested. The results of FEM analysis show that the variation of initial imperfection has less effects on the compressive strength for struts with vertical surcharge than for those with self-weight only, while the strength decreases as the initial imperfection increases. As the result of this study, the allowable initial imperfection for 20m long OHS struts is recommended to be less than L/350 on job sites.

References

  1. 김영학(2012) 팔각형강관을 사용한 장경간 버팀보의 역학적 거동과 강도, 석사학위논문, 경기대학교. Kim, Y.H. (2012) Mechanical Behavior and Strength of Long Span Strut with Octagonal Hollow Section, M.S. Thesis, Kyonggi University, Korea (in Korean).
  2. 국토교통과학기술진흥원(2013) 강관버팀보의 좌굴성능개선 및 실용화 연구, 건설교통 R&D 정책인프라사업 최종보고서. R&D / 11TRPI-C057350-01 (2013) Study on the improvements of buckling strength and practical application of steel tube struts (in Korean).
  3. 조재병, 정경섭, 이성행(2005) HR Plate의 교량 적용 가이드 개발, 최종보고서, 연구보고서, 한국강구조학회. Jo, J.B., Jung, K.S., and Lee, S.H. (2005) Developement of Guideline for the application of HR Plate to Steel Bridges: The Final Report, Research Report, KSSC, Korea (in Korean).
  4. 유정한, 김주우, 양재근, 강주원, 이동우(2013) 국부좌굴을 고려한 건축구조용 고성능강(HSA800) 조립각형강관 압축재의 적용성 평가, 한국강구조학회논문집, 한국강구조학회, 제25권, 제3호, pp.223-231. Yoo, J.H., Kim, J.W., Yang, J.G., Kang, J.W., and Lee, D.W. (2013) Evaluation on Applicability of Built-up Square Tubular Compression Members Fabricated with HSA800 High Performance Steel Considering Local Bucklings, Journal of Korean Society of Steel Construction, KSSC, Vol.25, No.3, pp.223-231 (in Korean).
  5. 박재우, 최선규, 유정한(2013) 탄소섬유쉬트(CFRP Sheets)로 보강된 장주 각형강관기둥의 중심축하중거동, 한국강구조학회논문집, 한국강구조학회, 제25권, 제3호, pp.299-305. Park, J.W., Choi, S.K., and Yoo, J.H. (2013) Behavior of Long Square Hollow Section Columns Retrofitted using Carbon Fiber Reinforced Polymer Sheets(CFRP Sheets) Subjected to Concentrated Axial Loading, Journal of Korean Society of Steel Construction, KSSC, Vol.25, No.3, pp.299-305 (in Korean).
  6. 이철호, 강기용, 김성용, 구철회(2013) 각형 콘크리트충전 강관기둥 부재의 구조설계기준 비교연구, 한국강구조학회논문집, 한국강구조학회, 제25권, 제4호, pp.389-398. Lee, C.H., Kang, K.Y., Kim, S.Y., and Koo, C.H. (2013) Review of Structural Design Provisions of Rectangular Concrete Filled Tubular Columns, Journal of Korean Society of Steel Construction, KSSC, Vol.25, No.4, pp.389-398 (in Korean).
  7. 한국지반공학회(2009) 구조물 기초 설계기준 해설. KGS(2009) Design Standard and Commentary of Structure Foundations, Korean Geotechnical Society, Korea (in Korean).
  8. 도로교설계기준(2010) 한국도로교통협회. KRBDC(2010) Korean Road Bridge Design Code, Korea Road & Transportation Association, Korea (in Korean).
  9. EN1993-1-1(2005) Eurocode No.3: Design of Steel Structures - Part 1.1: General rules and rules for buildings, European Committee for Standardization, Brussels.
  10. EN1993-1-5(2006) Eurocode No.3: Design of Steel Structures - Part 1.5: Plated structural elements, European Committee for Standardization, Brussels.
  11. 도로교설계기준(한계상태설계법)(2012) 한국도로교통협회. KRBDC (2012) Korean Road Bridge Design Code (LRFD), Korea Road & Transportation Association, Korea (in Korean).
  12. 한국강구조학회(2009) 하중저항계수설계법에 의한 강구조설계기준. KSSC (2009) Korean Steel Structure Design Code - Load and Resistance Factored Design, KSSC, Korea (in Korean).
  13. AISC (2010) Specification for Structural Steel Buildings, American Institute of Steel Construction, USA.
  14. AASHTO (2007) AASHTO LRFD Bridge Design Specifications, American Association of State Highway and Transportation Officials, USA.