on the design, fabrication and construction of steel structures, it is important to understand how the structural steel components that make up a building’s frame are created. A paper by Autodesk on “BIM and Digital Fabrication” describes the steel fabrication process: First a steel mill uses a hot-rolling manufacturing process to create stock structural steel members. This stock material is purchased by steel fabricators who cut and prepare the stock structural beams and columns for building construction based on shop drawings – instructions that describe exactly how to fabricate each individual piece of a structure. Once they are fabricated, the steel members are shipped to the building site and put in place by steel erectors. The role of the structural engineer is to design, analyze and certify a building’s structural frame and then create construction drawings that document the structural design
was selected. As only 60 % of the design was ready at the time, construction works commenced in the autumn of 2008 in parallel with detailed design. Completion was expected in September 2010. The contracting model used was Design-Bid-Build (DBB), which was a little surprising given that only 60 % of the design documentation was complete. However, the rationale was to allow selection of fabricators early, so that they could influence the final stages of design development. The steel fabricator, Rautaruukki Corporation, for example, was involved in completing the design due to their extensive knowledge and experience of steel detailing. This paid off in the long run, as no problems related to the dimensions or quality of steel elements and structures occurred during construction. 9.8.1 THE CRUSELL BRIDGE PROJECT AS A LEARNING EXPERIENCE
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