"Crocodile" Building in the Lokstadt Area Development in Winterthur, Switzerland

Lokstadt, a new urban district, is under construction in the city of Winterthur, Switzerland. The first building to be completed is called "Crocodile". This residential building, which was BIM planned right from the start, is one of the largest timber structures in Switzerland.

Dlubal customer Timbatec Timber Construction Engineers Switzerland Ltd. was responsible for the structural analysis of the timber structure and decided to use RSTAB.

The name "Lokstadt" was chosen because locomotives and other machines were once built on the site. From 1850 to 2010 Lokstadt was the most important production site for new locomotives and trains in Switzerland. The first electric Gotthard locomotive, the "Crocodile", started production here in 1919. The name of the first building to be completed pays homage to this legendary locomotive.


The "Crocodile" building is a six- to eight-story timber structure. It has a ring-like shape surrounding a courtyard and external dimensions of 348 ft in length, 213 ft in width, and 82 ft in height. The new building, with about 322,917 ft² of net internal area, houses 248 cooperative, rented, and owner-occupied apartments, as well as commercial space on the main floor.

The structure is a mixture of reinforced concrete and timber framing. The basement, part of the main floor, and the stairwells were made of reinforced concrete. The structural system of the rest of the building consists of glued-laminated timber columns and beams as well as large cross-laminated timber panels serving as floor slabs or hollow box elements for the roof. The CLT slabs have a length of up to 62 ft and a weight of up to 5.512 tons. The outer walls consist of prefabricated timber frame elements, including factory-installed windows.

This timber structure is a major contributor in preventing climate change. The timber used in the "Crocodile" building removes 7,070 tons of CO2 from the environment and stores it on a long-term basis.

Source: Konstruktiver Ingenieurbau 04/2022, pp. 23-30

Location Zürcherstrasse 41
8400 Winterthur

Implenia AG Switzerland

Anlagestiftung Adimora

Gaiwo Genossenschaft für Alters- und Invalidenwohnungen

Gesewo Genossenschaft für selbstverwaltetes Wohnen

General contractor Implenia Schweiz AG

ARGE Baumberger & Stegmeier AG

KilgaPopp Architekten AG

Structural engineering (timber) and fire protection Timbatec Holzbauingenieure Schweiz AG
Structural engineering (concrete) Dr. J. Grob & Partner AG

Project Specifications

Model Data

Number of Nodes 7260
Number of Members 10816
Number of Load Cases 14
Number of Load Combinations 2
Number of Result Combinations 3
Total Weight 1570.863 tons
Dimensions 101.71 x 167.44 x 81.53 feet
Program Version 8.26.02

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