Tree Tower in Bavarian Forest, Germany

Structures Analysed with Dlubal Software

  • Customer project

Customer Project

The path leading through forest treetops has a total length of 4,265 ft and is the longest treetop walk worldwide. It was built in 2009 in the Bavarian Forest National Park in Germany. The walk's principal tourist magnet is the walkable tree tower with a height of 144.3 m. It consists of a spiral structure with a length of 1,706 ft, directly connected to the 2,559-foot-long treetop walk.

Structural Engineering Project, Structural Analysis and Construction
WIEHAG GmbH
Altheim, Austria
www.wiehag.com
Architect Josef Stöger, Schoenberg, Germany
stoeger-koelbl.de
Investor Erlebnis Akademie AG, Bad Kötzting, Germany
www.eak-ag.de/eakag

Model

Architecture and Structural Analysis

The egg-shaped tree tower was built around three trees with a height of up to 124.6 ft, growing on a rock formation.

In this way, visitors are able to follow the trees' individual steps of growth. Reaching the two-story steel platform at the tower top, they can enjoy the view across the national park.

The tower's principal supporting structure, built mainly of timber, consists of 16 larch glulam beams, which are curved and arranged in rotational symmetry. The upper part of the tower was stiffened by a close mesh of diagonal steel members. The lower part was stiffened by four compression-resistant and tension-proof crosses consisting of steel hollow sections anchored with the timber arches.

The spiral timber structure is attached to the timber arches by steel suspensions and secondary steel beams. The structural system was calculated according to the second-order analysis.

The calculation resulted in a compression force of 260,778 lbs within the timber arches and a maximum horizontal tower deformation of 61.8 in.

“The egg shape of the structure required the use of a program that is able to calculate spatial frameworks. We decided to work with the Dlubal program RSTAB, which is best suited for such a challenge,” says Ralf Kolm, the engineer at the WIEHAG company who was responsible for the structural analysis.

Project Location

Baumwipfelpfad Bayerischer Wald
Böhmstraße 43, 94556 Neuschönau,Germany

Keywords

Tree tower

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  • Updated 21 June 2021

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