Four-Story Timber Structure in St. Georgen, Germany

Customer Project

Investor EGT Energy GmbH, Triberg, Germany
Architect Ketterer Architects, Konigsfeld-Neuhausen, Germany
Structural Design Isenmann Ingenieur GmbH, Haslach/VS-Villingen, Germany
Timber Structure Holzbau Bendler, Nordrach

The EGT Group’s new St. Georgen location was to be future-oriented designed considering both energy efficiency and sustainability. The new four-story oval building consists mainly of timber and was constructed in just four short weeks.

A concrete core was not even used in the project for structure stability. The structure’s stiffness comes exclusively from the solid cross-laminated timber walls.

Isenmann Ingenieur GmbH located in Haslach performed the structural static and dynamic analysis of the timber building in RFEM.

Structure and Seismic Analysis

The four-story timber structure is built on an under-ground reinforced concrete floor. A total of 45 bored piles with a maximum length of 59 ft further support the foundation.

The below-ground floor area is approx. 102 ft x 82 ft while the above-ground floors are 82 ft x  69 ft. The maximum height of the timber structure is 49 ft 4 in.

The building is located in seismic zone 1. Preliminary calculations confirmed seismic forces governed for the lateral design. Therefore, a modal analysis was performed on the 3D model in RFEM. In the calculation model, the individual components’ stiffnesses were set to a realistic as possible value.

For earthquake analyses, timber construction behaves more favorably than reinforced concrete structures. The acceleration design value is lower while the decreased mass has a beneficial effect on the calculated seismic forces.

To counteract the tensile forces, welded plates were added to ground floor cross-laminated timber end walls. The walls are welded adjacently with steel anchors.

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