34 Category 1: Buildings 1 Roofstructure Dental Office - Tienen, Belgium SE Contact Dirk Jaspaert Address Leopold Ruelensstraat 27 3010 Leuven, Belgium Website www.basbvba.be BAS bvba is primarily known for giving advice on architectural structural engineering. From the architect’s first conceptual idea onwards, interplay between spatial form and structural concept will be sought to obtain maximum coherence. In close collaboration with the architects and other advising team members, a number of design-cycles are organized to confront ideas which gradually result in a global concept of coherence wherein structure is (be it hidden) fully present. Owner Private Architect 51N4E General Contractor Memibo bvba Engineering Office BAS bvba Construction Period 01/2011 - 01/2013 The site for the building was challenging, being triangular with a three storey high wall on two of the sides. The third side offers a beautiful view of the garden. It would be a shame to block this view with structure, and therefore we needed to cover 9 m in a single span, preferably by a stiffened shell as thin as possible. The architect’s concept idea was to fold a DIN-sized piece of paper into a shell. This folded plane doesn’t follow the catenary arch, moments were introduced into the shell and stiffening structure. SCIA Engineer helped to model the wooden shell and curved beams. The variable wind loads and uneven snow loads made it difficult to derive a single direction of displacements. We placed a cutting edge at the glass window to investigate the displacements in each direction along this line. With this data, we could develop a connection detail with enough freedom between roof and glass. The shear forces between the thin-layer shell and the wooden beams where also calculated to evaluate the screw and glue connection. BAS bvba
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