Goethe Tower, Frankfurt am Main, Germany
As of July 2020, the Frankfurt City Forest once again has a lookout tower. The old Goethe Tower completely burned down due to arson in October 2017. The new Goethe Tower was designed similar to the original design from 1931. This time, however, it was built without chemical wood preservatives.
Grünflächenamt Frankfurt am Main
|Object and Structural Design||
Wirth Haker PartmbB
Holzbau Amann GmbH
The Dlubal customer Wirth Haker PartmbB from Freiburg, Germany was responsible for the object and structural design. The office used RFEM for the structural analysis of the lattice tower and the pulpit on the top.
The total height of the tower structure is 141 ft, and the width of the four columns is 24 ft on center at the base. The tower tapers towards the top, where the column spacing is 16.4 ft. The columns are oriented towards the center of the structure. They each have a 1.3 ft diameter at the bottom and 0.82 ft at the top.
In order to achieve high durability, block-glued chestnut timber was used for the support members. There is no approval for glued chestnut timber in outdoor locations. Therefore, tests were carried out at the Materials Testing Institute in Stuttgart, Germany, and approval was obtained per individual case. The stair treads and platforms are made of oak.
The joints are made of duplex coated steel. They were designed in a way (with dowels and key screws) so that individual support elements can be exchanged easily in the future. Effective solutions for wood protection were also fulfilled. For example, the tops of all horizontal beams and face sides are covered with sheets. In addition, all timber parts are connected with steel to provide a gap between the elements for air circulation.
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In this article, the adequacy of a 2x4 dimension lumber subject to combined bi-axial bending and axial compression is verified using RF-/TIMBER AWC add-on module. The beam-column properties and loading are based on example E1.8 of AWC Structural Wood Design Examples 2015/2018.
RF-/JOINTS Timber - Timber to Timber Add-on Module for RFEM/RSTAB | Design of Direct Timber Connections According to Eurocode 5
The design checks are available in a tabular form in the Timber Design add-on. The distribution of the design ratios can also be displayed graphically. There are extensive filter options available in the table as well as in the graphical output to display the desired design checks by a limit state or a design type.
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