School Building in Sutz-Lattrigen, Switzerland
The school building addition in Sutz-Lattrigen was built on the existing foundation floor. This foundation was not designed to withstand a second story. Therefore, the loads from the first floor and the additional second story had to be designed as concentrated loads. In order to reduce the weight but also for educational and sustainability reasons, timber was used in the construction of the new building.
Municipality of Sutz-Lattrigen, Switzerland
Bauzeit Architekten, Biel, Switzerland
Lanz Architekten, Sutz-Lattrigen, Switzerland
Indermühle Bauingenieure, Thun, Switzerland
|Civil Engineering of Reinforced Concrete||
Emch + Berger AG, Bern, Switzerland
|Timber Construction Company||
Wenger Holzbau AG, Steffisburg, Switzerland
Model Data of Primary Two-Story Structure
Indermühle Bauingenieure from the Swiss town of Thun was responsible for the timber engineering during the project phase, from the preliminary project to the supervision of the final design. The firm also completed the 3D project planning on behalf of the timber construction company. RFEM was utilized for the structural analysis.
The additional floor consists of floor-to-ceiling trusses in the longitudinal and transverse directions. The truss diagonals are glued laminated timber, while the chords are steel. The chords are integrated in the timber-concrete composite floors.
The diagonals are connected with dowels and internal steel plates. The second floor cantilevers are 10 ft in the longitudinal direction and 13 ft in the transverse direction over the first floor.
The visible timber structure, as well as the glazed exterior and interior walls, create an intimate, open atmosphere.
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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 model of the mountain station (top) and the valley station (bottom) (© Indermühle Bauingenieure)
Mountain station of the 3S cableway Klein Matterhorn during installation and the existing mountain station on the left (© Aircam Zermatt)
Floor-to-ceiling trusses with steel diagonals integrated in timber-concrete composite floors (© Indermühle Bauingenieure)
Cantilevered new upper floor on the renovated ground floor of the school building in Sutz-Lattrigen (© Indermühle Bauingenieure)
RFEM/RSTAB add-on module RF-/JOINTS Timber-Timber to Timber | Design of direct timber connections according to Eurocode 5
RF-/DYNAM Pro - Natural Vibrations Add-on Module for RFEM/RSTAB | Determination of natural frequencies and mode shapes
The cross-section resistance design analyzes tension and compression along the grain, bending, bending and tension/compression as well as the strength in shear due to shear force.
The design of structural components at risk of buckling or lateral-torsional buckling is performed according to the Equivalent Member Method and considers the systematic axial compression, bending with and without compressive force as well as bending and tension. Deflection of inner spans and cantilevers is compared to the maximal allowable deflection.
Separate design cases allow for a flexible and stability analysis of members, sets of members, and loads.
Design-relevant parameters such as the stability analysis type, member slendernesses, and limit deflections can be freely adjusted.
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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
Design of steel members according to the Swiss standard SIA 263
Fatigue design of members and sets of members according to EN 1993-1-9
Timber design according to Eurocode 5, SIA 265 and/or DIN 1052