Four-Story Timber Structure in St. Georgen, Germany
The EGT Group’s new St. Georgen location was to have a future-oriented design, taking into consideration both energy efficiency and sustainability. The new four-story oval building consists mainly of timber and was constructed in just four short weeks.
EGT Energy GmbH, Triberg, Germany
Ketterer Architects, Konigsfeld-Neuhausen, Germany
Isenmann Ingenieur GmbH, Haslach/VS-Villingen, Germany
Holzbau Bendler, Nordrach
No concrete core was even used in the project, for structural stability. The structure’s stiffness comes exclusively from its 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 underground reinforced concrete floor. A total of 45 bored piles with a maximum length of 59 ft further support the foundation.
The underground floor area is approximately 102 ft x 82 ft while the aboveground 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 the most realistic 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 the ground-floor cross-laminated timber end walls. The walls are welded adjacently with steel anchors.
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In this article, the adequacy of a 2x4 dimension lumber subject to combined bi-axial bending and axial compression is verified using RF-/TIMBER AWC add-on module. The beam-column properties and loading are based on example E1.8 of AWC Structural Wood Design Examples 2015/2018.
RFEM/RSTAB add-on module RF-/TIMBER CSA | Design of members made of timber according to CSA 086 (Canadian standard)
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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
Seismic and static load analysis using the multi-modal response spectrum analysis
Design of steel members according to Eurocode 3