Knies Magician's Hat in Rapperswil, Switzerland

Structures Analysed with Dlubal Software

  • Customer Project

Customer Project

The Knies Magician's Hat is the 2021 highlight of the reopened "Knies Kinderzoo" (personal petting zoo experience for children) in Rapperswil on Lake Zurich, Switzerland. The impressive shell structure was built using timber elements and rises to a height of 85 ft.

Owner
Gebrüder Knie Schweizer National Circus AG
8640 Rapperswil
Switzerland
Architecture Carlos Martinez Architekten
www.carlosmartinez.ch
General Contractor Ghisleni Partner AG
www.ghisleni.ch
Structural Engineering, Building Physics, and Fire Design PIRMIN JUNG Schweiz AG
www.pirminjung.ch
Timber Structures Blumer-Lehmann AG
www.lehmann-gruppe.ch

Model Parameters

Model

The new building in the children's zoo of the Knie Circus in Rapperswil brings a breath of fresh air to the site. The former sea lion arena has become obsolete, creating space for an event hall for concerts, banquets, events, and circus performances. The new building is impressive due to its unique architecture.

Dlubal customer PIRMIN JUNG was responsible for the structural design, structural design checks, and fire protection. They utilized RSTAB for the structural analysis and design.

Structure

The folded timber structure, designed by PIRMIN JUNG structural engineers, is held together by timber compression rings at heights of 36 and 59 ft and a concrete ring at the bottom. The compression rings give the roof structure a high degree of stability. Under the roof is the circus arena with a diameter of 104 ft, with a free span.

The structure is rotationally symmetrical and consists of twelve equal and twelve mirrored timber elements, each curved twice. Two of each element make a pair that forms one of the twelve V-shaped roof elements. They rest on the concrete tension ring at the low points of the collar roof. The "hat" forms the upper end of the roof structure.

The ribs and transverse ribs are made of glued-laminated timber. On top of this lies a double diagonal formwork made of local spruce, which is 0.94 inches thick and bent and nailed manually. The roof elements, including the roof sheathing and shingles, were prefabricated from galvanized sheet metal at the factory. As a result, they weighed up to four tons; the "hat" itself weighed almost 20 tons. Due to the high level of prefabrication, the assembly time on the construction site could be kept short. Thus, the noise pollution to residents and the animals in the Knies children's zoo was reduced to a minimum.


Project Location

Knies Children's Zoo
Oberseestrasse 36
8640 Rapperswil-Jona
Switzerland

Keywords

Timber folded plate structure Shell structure Timber Glued-laminated timber

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  • Updated 8 April 2022

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