Look-Out Tower at Treetop Path Steigerwald
|Investor||Bayerische Staatsforsten AöR
|Architect||Architectural office Josef Stöger
|Planning, Structural Engineering, Construction||WIEHAG GmbH
|Structural Analysis of Foundations||Ing.-Büro Wolf GmbH
Length: ~ 38.0 m | Width: ~ 38.0 m | Height: ~ 41.0 m | Weight: ~ 274 t
Number of Nodes: 1245 | Members: 1957 | Materials: 4 | Cross-Sections: 45
The look-out tower with a height of over 40 m is located in Ebrach (Upper Franconia), in the heart of the Steigerwald. The Steigerwald is after the Spessart the second largest deciduous forest area in Bavaria. 300-year-old beeches, amongst the oldest in Germany, soar into the sky with more than 40 metres.
After walking along the 500 m long treetop path, the visitors can use the spiral ramp to climb up the tower. Once at the top, the visitors can enjoy a unique view over the world cultural heritage Steigerwald.
The look-out tower has the shape of a truncated cone that opens out upwards. At the tower base, the outside diameter amounts to about 20 m and at the top to about 32 m. The main supporting elements form 12 curved glulam timber trusses which are rotationally symmetric arranged in an angular difference of 30°.
The outer spiral structure made of timber is fixed by steel cantilever beams to the timber supports. At a height of about 12 m is a half-pace which is supported on diagonal braces made of steel.
The viewing platform at the top consists of steel cantilver beams, protruding to the inside and longitudinal glulam timber stringers lying in between with planking.
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