Journal of Korean Society of Steel Construction (한국강구조학회 논문집)

Korean Society of Steel Construction (한국강구조학회)
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Experimental Study of High-strength Steel CHS X-joints Under Axial Compression

지관 압축을 받는 고강도강 X형 원형강관접합부의 구조적 성능에 대한 실험적 연구

  • Lee, Cheol Ho (Dept. of Architecture & Architectural Engineering, Seoul National University) ;
  • Kim, Seon Hu (Dept. of Architecture & Architectural Engineering, Seoul National University) ;
  • Chung, Dong Hyun (Dongyang Structural Engineers Group) ;
  • Kim, Dae Kyung (Dept. of Architecture & Architectural Engineering, Seoul National University) ;
  • Kim, Jin Won (POSCO Steel Solution Marketing Department)
  • Received : 2017.03.21
  • Accepted : 2017.07.19
  • Published : 2017.08.27
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Abstract

Most of current representative design standards worldwide forbid or impose restrictions on the use of high-strength steels for hollow tubular structures. The mechanical background of these limitations appears unclear and unduly conservative, and their validity needs to be re-evaluated. In this study, a total of 9 CHS(Circular Hollow Section) X-joints were tested under axial compression and analyzed to examine if the high-strength steel restrictions specified by current design standards could be relaxed. All the high-strength steel CHS X-joints tested showed satisfactory performance compared to ordinary steel joints in terms of serviceability, ultimate strength, and ductility, although the yield strength of steel was even as high as 800MPa.

고강도강 강관부재의 사용은 설계에서 시공에 이르기까지 다양한 이점을 제공할 수 있다. 그러나 현행의 국내외 대표적인 구조설계 기준에서는 강관구조에 고강도 강재를 적용하는 것을 금지하거나 제한하고 있다. 이러한 제한사항은 그 역학적 근거가 불분명하며 과도하게 보수적일 가능성이 있다. 본 연구에서는 일반강 및 고강도강 X형 원형강관접합부 압축 실험을 통하여 고강도강에 부과된 제한사항이 완화될 수 있는지에 대하여 다각도로 검토하였다. 실험 결과 고강도강 X형 강관접합부는 재료의 측정항복강도가 800MPa에 이름에도 불구하고 한계강도, 사용성, 연성의 관점에서 모두 일반강에 비견될 만한 성능을 보였으며, 이는 현행의 고강도강 제한사항은 완화되어야 함을 시사한다.

Keywords

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