Journal of Korean Society of Steel Construction (한국강구조학회 논문집)

Korean Society of Steel Construction (한국강구조학회)
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Flexural Testing of Asymmetric Hybrid Composite Beams Fabricated from High-strength Steels

고강도강재를 적용한 비대칭 하이브리드 합성보의 휨거동 실험

  • Jun, Su Chan (Dept. of Architecture & Architectural Engineering, Seoul National University) ;
  • Han, Kyu Hong (Dept. of Architecture & Architectural Engineering, Seoul National University) ;
  • Lee, Cheol Ho (Dept. of Architecture & Architectural Engineering, Seoul National University) ;
  • Kim, Jin Won (POSCO Steel Solution Marketing Department)
  • Received : 2017.03.20
  • Accepted : 2017.05.08
  • Published : 2017.06.27
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Abstract

Full-scale flexural testing of asymmetric H-shape hybrid composite beams was conducted in this study. In fabricating hybrid H-shape sections, high strength steels were utilized for the bottom flange while ordinary strength steels were used for the top flange and web. With adding a fully composite floor slab, a total of 8 hybrid composite beam specimens were tested. The primary objective was to develop the asymmetric hybrid H-shape composite beams with maximized flexural efficiency and investigate their flexural behavior. Not all the hybrid composite specimens tested in this study exhibited the plastic moment and reasonable deformability. In the specimens with high-strength bottom flange, the longitudinal shear crack of the slab along the beam axis often preceded the development of beam plastic moment, although the slab was designed as fully composite. The mechanical reason for this unexpected behavior is discussed. It is emphasized that the longitudinal shear strength of composite slab should be checked in designing hybrid composite beams utilizing high strength steels like in this study.

본 연구에서는 고강도강재를 적용한 비대칭 하이브리드 합성보의 휨성능을 실물대 실험을 통하여 평가하였다. 합성보의 웨브와 상부플랜지에는 일반강재(SM400, SM490)를 적용하고 하부플랜지는 상부플랜지에 비해 상대적으로 크게 제작하여 비대칭 단면으로 적용한 후 일반강재(SM520) 및 고강도강재(SM570, HSA800)를 각각 적용하였다. 본 연구의 주요 목적은 비대칭 하이브리드 합성보의 휨성능 평가 및 설계지침의 개발이다. 실험결과 하부플랜지에 일반강재를 적용한 실험체의 경우 $Dp/Dt{\leq}0.15$를 만족시킬 시 우수한 휨강도와 연성능력을 발현하는 것을 확인하였다. 반면 하부플랜지에 고강도강재가 적용된 실험체의 경우 휨내력의 증가로 인한 슬래브의 수평전단력 증가가 예상치 못한 슬래브 종방향 전단파괴를 발생시켜 소성강도에 도달하지 못하였다. 따라서 고강도강재를 적용한 비대칭 하이브리드 합성보의 경우 설계단계에서 슬래브 수평전단강도 확보가 필수적이다.

Keywords

References

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  3. 하이브리드 조립형 보강 기법을 적용한 철근콘크리트 보의 휨 성능 평가에 관한 실험적 연구 vol.20, pp.4, 2017, https://doi.org/10.9712/kass.2020.20.4.131