Tower in Reuss River Delta near Seedorf, Switzerland
Customer Project
The bird-watching tower in the Reuss River delta is an exceptional lookout construction in the Urner Alps. Its striking primary framework consists of 48 log wood columns standing in an inclined position. From four viewing platforms, people seeking relaxation enjoy the wonderful view over the river delta, and ornithologists can watch nesting birds.
| Structural Engineering |
Timber Structural Analysis Pirmin Jung Ingenieure für Holzbau AG Rain, Switzerland www.pirminjung.ch Civil Engineer Projekta AG Altdorf, Switzerland |
| Construction |
Holzbauer Gebrüder Bissig Holzbau GmbH Altdorf, Switzerland |
| Architect |
Gion A. Caminada Arch. BSA/SA Cons Vrin, Switzerland |
| Investor |
Canton Uri Committee for the Reuss River Delta Altdorf, Switzerland |
Model
The tower with a height of 37.7 ft was designed by the Swiss architect Gion A. Caminada. The structural analysis was performed by Pirmin Jung Engineers, a customer of Dlubal Software.
Structural Analysis and Construction
The round columns consisting of silver fir timber were chopped down, treated, and prepared in the immediate surroundings of the construction site.
At the base, they have a diameter of approximately 9.4 inches and are tapered towards the roof, which they bear as much as the viewing platform. The platform consists of planks that are 3.1 inches thick, cantilevering where the four lookout baskets are installed. It is directly attached to the log wood columns by means of brackets. The roof rafters are supported by the center post and the external columns.
Moreover, a steel ring hangs down the roof structure upon which the internal side of the platform floor lies and from which the spiral stairway is suspended.
All connections are built in such a way that they can be easily replaced after the service life has expired and without any influence on the total structure.
Stiffening
In addition to wind loads, the tower must be able to absorb vibrations from live load. As additional bracings or similar stiffening elements for horizontal structural stabilization did not come into consideration due to architectural reasons, the columns received a partial restraint to the steel ring in the roof. In this way, a kind of spatially effective frame was formed.
Keywords
Tower Lookout tower Timber structures Timber structure Timber Roof Structural design
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Saving Models as Blocks in RFEM 6
In RFEM 6 it is possible to save selected objects, as well as whole structures, as blocks and reuse them in other models. Three types of blocks can be distinguished: non-parameterized, parameterized, and dynamic blocks (via JavaScript). This article will focus on the first block type (non-parameterized).
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Timber Design | Strength and Stability | Input
The structural system is entered and the internal forces are calculated in the programs RFEM and RSTAB. The program provides access to the extensive material and cross-section libraries.
Timber Design is completely integrated into the main programs and automatically takes into account the structure and the available calculation results. Further entries for the timber design, such as effective lengths, cross-section reductions, or design parameters, are assigned to the objects to be designed. It is possible to select the elements graphically by using the [Select] function.
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Programs Used for Structural Analysis
Main Program
Structural engineering software for designing frame, beam, and truss structures, as well as performing linear and nonlinear calculations of internal forces, deformations, and support reactions
2,550.00 USD
Add-on Module
Timber design according to Eurocode 5, SIA 265 and/or DIN 1052
1,120.00 USD
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