Abstract
This paper presents the results of an experimental study on the mechanical behaviors of steel‒concrete composite decks with different shear span-to-depth ratios. Herein, four composite decks categorized into two types with shear span-to-depth ratios of 2.5 and 4.6 are designed for an experimental program. The decks then undergo the four-point bending tests until failure to investigate the structural responses, such as the load, displacement, crack mechanism, and failure mode. Conventional section analysis is used to derive the flexural strength of composite decks in comparison with the test results. Additionally, the ductility of the composite decks is assessed based on the displacement indices. The analysis results demonstrate that the stiffness and capacity of the composite deck increase with the decrease in the shear span length. However, the ductility of the composite slabs increases with the shear span length. The flexural strengths predicted by section analysis overestimate the actual test results. The shear span-to-depth ratio affects the crack mechanism of the composite decks.
Highlights
Besides conventional steel-reinforced concrete (RC) structures, structures made by steel–concrete composite systems have been gained the attention of researchers and engineers
Incomposite addition, decks increased with thedecks decrease the shear span-to-depth addition, the bethe behavior of all tested wereofsimply categorized into tworatios
The maximum moments and deflections at peak loads of the series I specimens increased by 21% and 40%, respectively, compared to those produced by the series II specimens. These results indicated that the shear span-to-depth ratio influenced the post-cracking behavior of the steel-concrete composite decks
Summary
Besides conventional steel-reinforced concrete (RC) structures, structures made by steel–concrete composite systems have been gained the attention of researchers and engineers. A novel composite metal decking system with innovative technology is made from cold-formed steel [1]. This composite deck utilizes cold-formed profiled sheets identical to those used as roofing products [2], which are poured over the profiled sheets. Nowadays, this construction method has become more favorable for clients to use in their construction projects since it is faster and safer than the conventional RC slab. There are two key reasons for the use of the cold-formed profiled sheet for producing composite slab systems. The cold-formed profiled sheet can be used as formwork during the casting of concrete [3]
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