Alphen aan de Rijn Length: 107 m Width: 63 m Height: 20 m Why is this project important? The importance of this project lies in its function of town hall, which should be embodied by the building. With the town hall the local authority indicates the intended quality and ambition of the future development of the town heart. The building must be open and inviting and it should be functional and kind to its customers. Also of great importance is the internal design of the public area, which should be in harmony with both the new and the old city centre. Why is this project so special? This project is made special by the shape of the different parts of Pallet, SCO-roof and sloping back of the building. Flowing rooflines and slim connecting structures create structural shapes that are only to be made visible by spatial computer models. The complex geometry of the building has been imported into AutoCAD, from the computer programme Mechanical Desktop used by the architect. After some adaptations and additions, this geometry has been read into the calculating package ESA-Prima Win, that is used by ABT. This link was ideal. For this project, the possibility of importing a DXF-file was a very powerful feature. Without this, it would have been almost impossible to put the very complex structure (with nearly no repetition!) into ESA-Prima Win, without doing months of dull work. The geometry appeared complex to such an extent that it was agreed upon to take the main dimensioning of the architect as a starting point. These complex shapes make it necessary to fix this model at the start with the specifications completed. This then asks for a higher level of detailing by the designing parties. It is clear that this design produces complex calculations. All eccentricities and complex geometry's create complex calculations both for main as for detailed computation. Use of ESA-Prima Win Modules used: 3D Frame 3D Shell Steel code check Description of the technical questions to be solved with ESA-Prima Win: The complexity of the structure made it virtually impossible to calculate it in 2D. All of the columns in the facades have different (and differentiating, due to the BLOB-architecture!) angels, thus introducing all different kinds of horizontal forces on the structure. The influence of these forces, plus the important structural behaviour of the whole building together, made it necessary to use ESA-Prima Win. ut the model has also been used for studying possibilities. For example, the deformations of the large cantilever with the two large steel trusses had to be reduced, due to the glass facade. Furthermore the influence of the atrium being absent during constructionphase was something that had to be studied. A description of your experience with ESA-Prima Win when realising the project: As said above, ESA Prima Win was a necessary design- and study-tool for this project. With it's user-friendly interface, and shear endless possibilities, it proofed to be a worthy, powerful and indispensable (for this project) FEMapplication. Birds view of structure. Frontal view, atrium-roof Side view, with clear look on cantilever and trusses Side view of Pallet, with on the left side adjacent the SCO-roof, taken from the start of the car-parking entrance. Rear-view, construction of 1st floor Rendered picture from architectural design, side view, complete building (left pallet, middle SCO-Roof) Rendered picture from architectural design, front view, with view on atrium and cantilever. 51 SCIA User Contest Catalog
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