Look-Out Tower in Bad Wildbad, Germany

Customer Project

Planning, Structural Engineering, Construction WIEHAG GmbH
Altheim, Austria
www.wiehag.com
Structural Analysis of Foundations Ing.-Büro Wolf GmbH
Passau, Germany
Architect Architectural office Josef Stöger
Schönberg, Germany
www.architekt-stoeger.de
Investor Erlebnis Akademie AG
Bad Kötzting, Germany
www.eak-ag.de

Length: ~ 40.5 m | Width: ~ 40.5 m | Height: ~ 40.0 m | Weight: ~ 292 t
Number of Nodes: 1,078 | Members: 1,751 | Materials: 4 | Cross‑Sections: 45

The look-out tower with a height of 40 m is the highlight of the tree-top trail on the Sommerberg hill in Bad Wildbad, Germany. The viewing platform on the top of the tower offers a remarkable view over the densely wooded Central/North Black Forest Nature Park.

WIEHAG GmbH from Altheim, Austria, a customer of Dlubal Software, was responsible for the planning, structural analysis and design, fabrication, and assembly of the tower. Structural calculations were performed in RSTAB.

Structure

The shape of the look‑out tower resembles a beaker. The structure consists of an outer ring made of 12 double inclined glued‑laminated timber beams, which are rotationally symmetrically arranged at the same distance from each other.

12 main supports are inclined about 7.7° from the center point and tilted about 9.4° anticlockwise. Thus, the tower looks like a slightly inclined and twisted beaker.

The tower can be accessed at the height of 5 m from the tree‑top trail, which winds through the tree tops with a total length of approximately 1,250 m at a height of up to 20 m.

You can climb up to the viewing platform on a helix structure made of wood, which is attached to the timber supports by steel cantilever beams. Between the individual cantilever beams, there are timber stringers covered with a wooden plank floor.

On the top of the tower, there is a viewing platform made of steel. The platform consists of steel cantilever beams, protruding to the outside and connected to the timber columns. On the cantilever beams, there are again timber stringers covered with the wooden planks.

The structure is stiffened by a circumferential web made of steel diagonals and ring structures.

Programs Used for Structural Analysis

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