This technology is a composite beam that creates a closed section by attaching a bent steel inverted U-shaped cover to an open-top steel beam, and provides shear connection with slab concrete through steel anchors formed at each side-perforation aligned along the cover's sidewalls.
Composite beams made by filling concrete into channel-type open-section steel previously required separate shear connectors like stud bolts, steel plates, or rebar to resist shear forces between the steel and concrete. Open-section steel assembly composite beams had lower flexural rigidity than closed sections, while bent steel plate composite beams had limited concrete space, requiring reinforcement with tendons. Furthermore, long rebar or dowel bar shear connectors often interfered with deck plates, making installation difficult.
This technology features steel anchors designed with a narrow anchor neck protruding toward the center of the side-perforation and a wide anchor head at the end to ensure sufficient bearing projection area. There are two configurations: one where the perforation is made in a recessed part of the sidewall and the anchor is tilted outward, and another where it is made in a protruding part and the anchor is tilted inward. The cover can be installed at the same length as the steel beam or in shorter, spaced segments. Applicable to composite beam floors in offices and logistics facilities using deck plates, semiconductor and electronics factories with cleanrooms, and remodeling projects requiring lower floor heights, this system achieves both cross-sectional rigidity and shear connection through cover forming alone, eliminating the need for stud welding or long connectors that conflict with deck plates.
This invention was developed with support from the Ministry of Education for the development of parking lot construction methods using studless concrete-filled composite beams.
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