Five-Story Timber Passive House in Friedrichshafen, Germany
More and more cities and towns, especially in southern Germany, are open for multi-story timber buildings. Also the German city of Friedrichshafen on Lake Constance got convinced of the apartment building concept by the wood construction company Müllerblaustein Holzbau GmbH.
|Structural Analysis, Thermal Insulation, Energy Balancing, Acoustics||
Pirmin Jung Ingenieure
|Investor, Developer, General Contractor, Planning, Production, Assembly||
Müllerblaustein Holzbau GmbH
The multigenerational house with a lakeside view was built as an environmentally friendly timber structure and designed as a passive house. The engineering office Pirmin Jung Deutschland GmbH, a customer of Dlubal Software, was in charge of structural analysis, among other things.
Structure and Design
With a length of 45 m and a width of about 23 m, the five-storey timber structure provides a total space of 2,200 m² for 19 apartments. The glazed entrance area in the central part connects two asymmetrical residential parts of the building.
The foundation consists of a reinforced concrete floor slab with a thickness of 25 cm. The basement is also made of reinforced concrete and includes storage rooms, and building equipment rooms, and underground parking lots. Above the concrete structure is the 15.8 m high timber structure.
The building envelope consists of wooden panels, the inner walls are partly made of 10 cm thick laminated timber with five layers and partly of wooden panels. The floor slabs are composed of a timber-concrete composite system. On the 12 cm thick cross-laminated timber panels, a fast-setting concrete layer with a thickness of 14 cm was poured on site. The building reinforcement comprises exclusively the timber structure, that is, partition walls between the apartments and the timber-concrete composite slabs.
Since the Lake Constance region is located in the earthquake zone 2, the engineering office Pirmin Jung also had to analyze the earthquake load case on the 3D model in RFEM. For this, the response spectrum method in RF-DYNAM Pro has been used. 'Since the joint forces could be calculated exactly, it contributed to a more cost-effective solution compared to the commonly used resultant force method,' say the engineers of Pirmin Jung.
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The effects due to snow load are described in the American standard ASCE/SEI 7-16 and in Eurocode 1, Parts 1 through 3. These standards are implemented in the new RFEM 6 program and the Snow Load Wizard, which serves to facilitate the application of snow loads. In addition to this, the most recent generation of the program allows the construction site to be specified on a digital map, thus allowing the snow load zone to be imported automatically. These data are, in turn, used by the Load Wizard to simulate the effects due to the snow load.
Timber Supporting Structure in RFEM: 3D Model (Top) and Mode Shape Calculated in RF-DYNAM (Bottom) (© Dr. Ing. Berger, Dr. Ing. Gadner Merano)
Compared to the RF‑/TIMBER Pro add-on module (RFEM 5 / RSTAB 8), the following new features have been added to the Timber Design add-on for RFEM 6 / RSTAB 9:
- In addition to Eurocode 5, other international standards are integrated (SIA 265, ANSI/AWC NDS, CSA 086, GB 50005)
- Design of compression perpendicular to grain (support pressure)
- Implementation of eigenvalue solver for determining the critical moment for lateral-torsional buckling (EC 5 only)
- Definition of different effective lengths for design at normal temperature and fire resistance design
- Evaluation of stresses via unit stresses (FEA)
- Optimized stability analyses for tapered members
- Unification of the materials for all national annexes (only one "EN" standard is now available in the material library for a better overview)
- Display of cross-section weakenings directly in the rendering
- Output of the used design check formulas (including a reference to the used equation from the standard)
- How do I perform stability analysis to determine the critical load factor in RFEM 6?
- Where can I find the materials for the corresponding National Annexes in RFEM 6 and RSTAB 9?
- How does the "Orthotropic Plastic" material model work in RFEM?
- What is the meaning of the superposition according to the CQC rule in a dynamic analysis??
- Can I use RFEM to calculate a log house three-dimensionally?
- How do I display some results of all load cases in the printout report, but other results of the selected load cases only?
- I would like to carry out the flexural buckling design for timber components with imperfections and internal forces according to the second-order analysis. Is it sufficient to activate this in Details of the RF‑/TIMBER Pro add-on module or is it necessary to make additional settings?
- Can I design laminated veneer lumber with RFEM/RSTAB?
- How can I calculate a timber-concrete composite floor with cross-laminated timber?
- How do I create a frame joint with taper in JOINTS Steel - Rigid?
Programs Used for Structural Analysis
Structural engineering software for finite element analysis (FEA) of planar and spatial structural systems consisting of plates, walls, shells, members (beams), solids, and contact elements
Dynamic analysis of natural frequencies and mode shapes of member, surface, and solid models
Dynamic and seismic analysis including time history analysis and multi-modal response spectrum analysis
Seismic and static load analysis using multi-modal response spectrum analysis