Look-Out Tower in Bad Wildbad, Germany
|Planning, Structural Engineering, Construction||
|Structural Analysis of Foundations||
Ing.-Büro Wolf GmbH
Architectural office Josef Stöger
Erlebnis Akademie AG
Bad Kötzting, Germany
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.
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.
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Programs Used for Structural Analysis
The structural engineering software for design of frame, beam and truss structures, performing linear and nonlinear calculations of internal forces, deformations, and support reactions
Timber design according to Eurocode 5, SIA 265 and/or DIN 1052
Stress analysis of steel members
Design of steel members according to Eurocode 3
Dynamic analysis of natural frequencies and mode shapes of member models
Stability analysis according to the eigenvalue method