1 Kyvelou, P., Hui, C., Gardner, L. and Nethercot, D. A. (2018) Moment Redistribution in Cold-Formed Steel Sleeved and Overlapped Two-Span Purlin Systems. Advances in Structural Engineering. Moment redistribution in cold-formed steel sleeved and overlapped two- span purlin systems Pinelopi Kyvelou 1 , Chi Hui 2 , Leroy Gardner 3 , David A. Nethercot 4 1 Department of Civil & Environmental Engineering, Imperial College London, SW7 2AZ, UK. E-mail: pinelopi.kyvelou11@imperial.ac.uk. (Corresponding author) 2 Department of Civil & Environmental Engineering, Imperial College London, SW7 2AZ, UK. E-mail: chi.hui@imperial.ac.uk. 3 Department of Civil & Environmental Engineering, Imperial College London, SW7 2AZ, UK. E-mail: leroy.gardner@imperial.ac.uk 4 Department of Civil & Environmental Engineering, Imperial College London, SW7 2AZ, UK. E-mail: d.nethercot@imperial.ac.uk Abstract Cold-formed steel purlin systems with overlapped or sleeved connections are alternatives to continuous two- span systems and exhibit different degrees of continuity. Both connection types are highly favourable in practice since they are both strategically placed over an interior support to provide additional moment resistance and rotational capacity where the corresponding demands are at their largest, thus improving the overall structural efficiency. Until recently, full scale testing has been the most common way of investigating the structural behaviour of such systems. In the present study, numerical modelling, capable of capturing the complex contact interactions and instability phenomena, is employed. The developed finite element models