Tree Tower Lipno, Czech Republic
Structural Analysis of Tower
Office for Structural Engineering
Ing.-Büro Wolf GmbH
Architect Josef Stöger
Stezka korunami stromu s.r.o.
Lipno nad Vltavou, Czech Republic
In summer 2012, the first Czech tree-top walk was opened in Lipno in the presence of Václav Klaus who is President of the Czech Republic. A path with a length of 675 m leads to the major tourist attraction: the tree tower.
On the top platform at a height of 40 m, visitors can enjoy the wonderful view from the wooden look-out construction over the Šumava National Park and the Lipno Dam on the Vltava River. In its center, the tower includes a playground slide of 52 m length representing the longest closed slide in the Czech Republic.
The tower construction consists of an external circular ring based on nine glued‑laminated timber columns which have been arranged in rotational symmetry and set up with an angle difference of 40° each, thus forming a polygonal, spatial structure.
Inside the tower, a steel pylon made of a round pipe has been built. Steel spiral stairs with steel grids and a tunnel slide are attached to the pylon which is connected to the tower at two height levels: at 24 m and 40.175 m.
Visitors have access to the tower by either coming along the tree‑top walk ending at 24 m above ground or climbing the spiral stairway. Then, they can reach the viewing platform by climbing a spiral timber construction which is attached to the timber columns by means of cantilevered steel beams.
The construction has been stiffened by a close mesh of diagonal steel members anchored in the timber columns. Furthermore, four horizontal ring constructions consisting of steel pipes have additionally been arranged in the lower part of the tower.
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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
Stability analysis according to the eigenvalue method
Dynamic analysis of natural frequencies and mode shapes of member models
Dynamic and seismic analysis including time history analysis and multi-modal response spectrum analysis
Seismic and static load analysis using the multi-modal response spectrum analysis