Five-Story Timber Passive House in Friedrichshafen, Germany

Customer Project

Structural Analysis, Thermal Insulation, Energy Balancing, Acoustics Pirmin Jung Ingenieure
Sinzig, Germany
Investor, Developer, General Contractor, Planning, Production, Assembly Müllerblaustein Holzbau GmbH
Blaustein, Germany
Architect Ecorumi
Friedrichshafen, Germany

More and more cities and towns, especially in southern Germany, are open for multi‑story timber buildings. The wood construction company Müllerblaustein Holzbau GmbH has convinced the German city of Friedrichshafen on Lake Constance of this apartment building concept.

The multigenerational house with a view at Lake Constance was built as an environmentally friendly wooden structure and designed as a passive house. The Dlubal Software customer Pirmin Jung Ingenieure from Sinzig, Germany, was in charge of the structural and dynamic analysis.

Structure and Design

With a length of 147.6 ft and a width of about 75.5 ft, the five‑story timber structure provides a total space of about 23,681 ft² 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 9 27/32 in. The basement is also made of reinforced concrete and includes storage rooms, building equipment rooms, and underground parking lots. Above the concrete structure is the 52 ft high timber structure.

The building casing consists of wooden panels. The inner walls are made partly of five‑ply 3 15/16 in thick laminated timber and partly of wooden panels. The floor slabs are composed of a timber-concrete composite system. On the 4 23/32 in thick cross‑laminated timber panels, a fast‑setting concrete layer with a thickness of 5 33/64 in 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 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 was used. “Since the joint forces could be calculated exactly, it contributed to a more cost‑effective solution compared to the commonly used lateral force method,” the engineers of Pirmin Jung reported.

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