Paper Title
Behaviour of Composite Beams with Narrow and Wide Parallel Ribbed Steel Decking

Abstract
This research involved modelling 146 push-off tests using ABAQUS/Explicit package to study the behaviour of composite beams with both narrow and wide parallel ribbed deck. The most significant finding of this research indicated a non-direct relationship of the rib deck ratio with the shear connector resistance, contrary to it was believed in the past. FE results showed that a bigger amount of rib deck ratio could result in a decline of the shear connector resistance and vice versa. A better explanation for this discrepancy was then attributed to the area of the effective cross-section of concrete. Specimens with a large effective cross-section area of concrete revealed more shear connector resistance than those with a small effective cross-section area of concrete irrespective of the rib deck ratio. As the rib deck ratio is reflected as a direct relationship with the load capacity in many formulae predicting the shear strength of stud in aparallel metal deck, such finding here will put the reliability of those formulae under question. Keywords - Composite beams, Headed stud, Narrow ribbed steel decking, Rib deck ratio, FE analysis