This course covers contemporary structural design with an extremely popular material —­ tubular steel. An overview of international specifications and design guides is given and "state-of-the-art" limit states design procedures are presented, discussed, and illustrated with worked examples. Offshore structures are given some treatment but the course concentrates on onshore structures made from manufactured tubing or Hollow Structural Sections (HSS). Specific topics deal with: materials, testing and properties; columns and poles; concrete filling; fire protection; fabrication, including bolting, welding and nailing; plastic analysis of connections; welded tube-to-tube connections; braced frames and bracing design; bolted connections; finite element analysis of tubular structures; truss design for 2D triangulated or Vierendeel trusses; 3D space frames; moment-resisting frames and connections; and fatigue of connections.