48 Category 1: Buildings 1 Redesign of Timber Roof Construction - Berlin, Germany SE Architect Architekt Schnabel, Berlin Engineering Office Ingenieurbüro Dr. Häfner Construction Period 01/2015 - 05/2015 The project concerns the redesign of the roof framework for new rooftop flats in Berlin. It is a typical residential building of the Wilhelmina period with a 5 storey of masonry wall construction, ceiling timber beam/joists and timber roof framework with rafters and purlins. Conceptual design was created in collaboration with architect and owner/client for layout of new flats. The timber roof structural system was changed after removal of several columns and timber bracing. SCIA Engineer was used to build a 3D model of the roof construction with rafter, partially strengthened purlins, stayed columns, composite ceiling beams and new steel bracing. Structural linear/nonlinear analysis was performed with self-weight, snow and wind action according to EC1 and EC2. In the next step the program was used for the design ULS/SLS check of structural elements according to EC5 timberwork, EC3 steelwork and EC6 masonry. In the end we investigated an alternative of existing solid timber ceiling as composite beam strengthened by high strength material of laminate veneer lumber (LVL). The approach used allowed for an effective structural engineering with 3D modelling, analysis and design for cost-effective re-construction, especially for various construction states. It helped to face the challenges like FE modelling of mixed materials of timber, steel and wood composite and composite beam connections by rigid coupling. Moreover, it streamlined the planning of structural details with steel elements in collaboration with architect. Ingenieurbüro Dr-Ing Häfner Contact Lothar Dr. Häfner Address Sophie-Charlottenstr. 9-10 14059 Berlin, Germany Email [email protected] IBH-SE&L&T offer engineering and consulting services in the fields of structural engineering and civil planning as well as in other fields: • Structural engineering with 3D modelling, visualization, analysis, design with ULS /SLS check and detailing with usual and advanced technologies. • Preliminary design and construction/supervision management. • Experts in forensic investigation for feasibility studies, noise, wind action, causes of structural failures. • Providing Lecturing & Training to national and international businesses and University Institutes.
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