structural design. The structural drawings contain only general requirements for steel fabrication – instructions for typical steel connections. A steel detailer then takes those construction drawings and applies those general connection instructions to the specific structural components and the specific geometry of the building as represented in the construction drawings – creating shop drawings that instruct the steel fabricator exactly 7 how to fabricate each piece of steel in the building. Shop drawings include detailed information pertaining to material specifications, sizes, dimensions, welding, bolting, surface preparation, painting requirements, etc. (BIM and Digital Fabrication, 2008). 1.1. Last Decade in Steel Construction According to Reifschneider and Santamont, less than 10 years ago, most engineering
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 The Crusell Bridge project became a BIM learning process for everybody involved, even for those who had previous
annaabi.ee 
