Abstract
In conventional composite construction involving hot-rolled steel section, the composite action is usually achieved by using conventional headed shear studs connectors. However, use of headed studs is not practical for cold-formed steel (CFS) section due to its very thin form that is difficult to weld. A suitable bolt and nut type shear connector was proposed; experimental tests were carried out to evaluate its performance. This study also investigated the use of Self-Compacting Concrete (SCC) integrated with CFS by means of bolted shear connectors to develop composite action. Therefore, the objective of this paper was to investigate the performance of bolted shear connectors in SCC integrated with CFS section as composite beam system. Eighteen push-out test specimens comprising of M12, M14 and M16 sized bolted shear connector of grade 8.8 with longitudinal spacings of 150 mm, 250 mm and 300 mm centers were fabricated, cast and tested until failure. The experimental results showed that all bolted shear connectors possessed a good shear resistance capacity. Not much difference in strength capacity of specimens with M14 and M16 bolted shear connectors was found, perhaps due to CFS failure. Varying the size and longitudinal spacing of the bolted shear connectors revealed that the connectors' strength capacity changed slightly between M14 and M16 bolts specimens but, significantly for M12 bolt specimens.
Highlights
Steel-concrete composite beam has been in use as a structural member in buildings and bridges for decades (Pavlovic et al, 2014)
The cold-formed steel (CFS) used was of 990 mm2 gross cross-sectional area, the bolted shear connectors consisted of M12, M14 and M16 with cross-sectional areas of 113.1 mm2, 153.9 mm2 and 201.1 mm2 respectively
Push-out test for specimens with M12, M14 and M16 bolts of grade 8.8 used as shear connectors were conducted
Summary
Steel-concrete composite beam has been in use as a structural member in buildings and bridges for decades (Pavlovic et al, 2014). The shear connection between steel and concrete. 732 M.M. Lawan et al / Bolted Shear Connectors Performance in Self-Compacting Concrete Integrated with Cold-Formed Steel Section slab is inherently significant, because it resists separation between the two components and it enhances longitudinal shear transmission (Kim et al, 2011). The most common form of shear connection in composite beams system is the use of mechanical devices referred as shear connectors (Parakash et al, 2012). The stud connectors are welded to a steel flange and encased in concrete to provide the composite action (Pallares and Hajjar, 2010). The strength and ductility of shear connectors can be examined through push-out test, in which two concrete composite slabs are connected to both flanges of the steel beam
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