1 Design of biaxially loaded external slab column connections Deema Abu-Salma PhD candidate, Department of Civil and Environmental Engineering, Imperial College London, London, United Kingdom Robert L Vollum* Professor of Structural Concrete, Department of Civil and Environmental Engineering, Imperial College London, London, United Kingdom Lorenzo Macorini Reader in Structural Engineering, Department of Civil and Environmental Engineering, Imperial College London, London, United Kingdom *Corresponding author email: [email protected]