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http://dx.doi.org/10.7781/kjoss.2017.29.3.217

Flexural Testing of Asymmetric Hybrid Composite Beams Fabricated from High-strength Steels  

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)
Publication Information
Journal of Korean Society of Steel Construction / v.29, no.3, 2017 , pp. 217-228 More about this Journal
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.
Keywords
Asymmetric hybrid composite beam; High-strength steel; Plastic neutral axis; Longitudinal shear force; Plastic stress distribution method; Shear friction;
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Times Cited By KSCI : 3  (Citation Analysis)
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