Mechanical properties of steel. Mechanical behaviour of steel beams and columns. Behaviour of connections. Methods of global analysis. Seismic design and codes. Ductility, behaviour factor and damage. Capacity seismic design. Typology of steel structures. Effect of global instability. Effects of diaphragms, semi-rigid connections and axial forces. Examples of seismic design of steel structures. Introduction to the performance-based seismic design. Displacement-based design. Hybrid force and displacement-based design. Damage controlled design. Use of advanced methods of analysis in seismic design.