Nemetschek Engineering User Contest 2009 • Category 5: CAE Special Projects 217 5 New Airport Terminal in Bratislava only partial decks for technics and machine rooms. The bearing structure is designed as a combined skeleton, with basic modulus span of 18m in the longitudinal direction and irregular spanning of 12+9+18+9 m in the transverse direction. The foundation slab and underground walls are made of cast-in-place concrete, with cast-in-place flat slab on the ground level. The main overground floor slab on the third level is designed mainly in concrete, with prestressed primary beams and prestressed secondary beams, partly as a composite structure. On the 2-nd level an intermediate deck is designed, which has to be suspended from the main deck according to spatial requirements. The primary beams are thus designed as truss girders spanning 18m, with composite secondary beams. The technological decks on the 4-th and 5-th level are designed as composite structures with primary steel and secondary beams with a concrete slab. The roof structure is designed as a continuous wavy truss girder with a total length of 84,5m, spanning 39+27 m with cantilevers on both ends. Each truss girder is a spatial structure in both longitudinal and transverse direction, supported with three columns, which branch out in four legs to support the truss. Besides the main steel structure of the roof, an auxiliary truss steel structure is designed to support the facade. CAD design According to the complicated structural layout (every floor has different dimensions) it was decided to make a complete 3D-model of the structure, while in architecture only 2D-design was carried out. The aim of the 3D-model was to check all of the complicated spatial details of edges and intersections, as well as to generate plan and elevation drawings without mistakes. The 3D-CAD design was carried out in Allplan, whereas a subsequent transfer to a structural model in Scia Engineer was planned. Furthermore the 3D-model should be later used in as a base for form- and reinforcement drawings. Structural analysis The comprehensive 3D structural model was carried out in Scia Engineer, with partial automatic transfer from Allplan. Although much handwork has to be added to develop the structural model, the use of the architectural model from Allplan was successful. The structural model was then completed with geotechnical subsoil - thanks to Scia Engineer’s Soilin module - and used for the global structural analysis. Besides of static calculations also a dynamic analysis of seismic loading was carried out. In the next step of the design process, it was considered to make the model even more complete with respect to construction phases as well as other detailed solutions. Project evaluation The challenging structure of the new airport terminal was successfully designed in the phase of building permit as well as tender documents. The combination of the 3D architectural and structural models of Allplan and Scia Engineer was very useful and saved a great amount of time and routine work. The next phase of execution detailing started in autumn 2008. The structure is now under construction and the execution detailing is carried out by another consulting company using casual designing techniques.
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