This paper is concerned with the ultimate behaviour of isolated flat slab members at the connection to interior
columns. An experimental programme that focuses on the response of two-way members with various material and
geometric configurations is presented. A full account of the results of ten scale tests comprising members with and
without transverse reinforcement as double-headed shear studs is given. After describing the experimental
arrangement and specimen details, the results and observations obtained from tests are provided and discussed.
Particular attention is given to the influence of a number of key parameters that characterise the behaviour at the
ultimate state such as slab thickness, layout and amount of the flexural and transverse reinforcement. The test
results enable direct assessment of the governing factors that affect the behaviour and failure mode of flat slab
members at the connection to interior columns. Finally, experimental results and observations are used to assess the
adequacy of strength predictions obtained from analytical models currently adopted in design.