Longitudinal shear behaviour in composite slab with profiled steel decking

Composite slabs with profiled sheeting are broadly used in steel framed structures throughout the world. Its shear behaviour is a complex phenomenon to be explored, and hence, experimental and theoretical studies are carried out to investigate its shear strength under imposed flexural loading to evaluate using m-k method, Partial Interaction method and Force Equilibrium method. In this project, in-depth analysis of longitudinal behaviour in composite slab and verification of the conservativeness of m-k method and Partial Interaction method will be shown. A full-scaled experimental study has been carried out for the investigation and analysis. A total of eight composite slab specimens were cast using C25 grade concrete – four of which were longer specimens (4x1x0.11m) and the remaining four were shorter specimens (2.6x1x0.11m). Test setups and evaluation methods were in accordance to Eurocode 4. In the lead of applying increasing loads on the composite slab specimens, slippage and deflection of specimen were observed in the experiment. The causes of failure of the composite slabs were by longitudinal shear and loss of interlocking at the contact surface of the metal steel decking and concrete. For both failure, the cause was by shear bond, which will be further analysed in relation to the calculated empricical parameters of ‘m’ and ‘k’ values in m-k method. Upon going through the static, cyclic and subsequent tests for the composite slab specimens, experimental values of end slip, deflection and failure loads were recorded for further evaluation. In concurrence with past research, the design shear resistance V1,Rd of m-k method is of a lower value that the experimental shear force value Vtest,ave, while Vut,ave of Partial Interaction method is of a higher value than Vtest,ave. Therefore, the analysis states that m-k method is a more conservative method that Partial Interaction method.Bachelor of Engineering (Civil