green BUNKER.

This article discusses the transformation of a large concrete bunker in Hamburg into a new urban garden and public space. The bunker, which was not being fully utilized, will now include a hotel, gymnasium, and cultural venues. The design incorporates terraced spaces with greenery, including full-sized trees, and includes irrigation and drainage systems. The project was a collaboration between residents, architects, and a real estate firm, and there are plans for various memorials to document the bunker's history. The design team had to carefully consider the structural load assumptions and minimize disruptions to the interior spaces. The article also discusses the structural design and construction of a vertical extension to the bunker. The team aimed to avoid reinforcing the existing top slab by directing additional forces from the new levels to the bunker's solid columns and walls. They initially considered a girder grillage concept but ultimately developed an alternative concept using stacked concrete walls to allow for public circulation and emergency escape routes. The design also included a new concrete lift shaft and new columns for horizontal stability. The structural analysis was conducted using a 3D finite-element model, and it was determined that the bunker's foundation slab could withstand the additional loads. The project also involved the installation of outdoor elevators and the creation of a city garden on the rooftops. Overall, the design team used innovative engineering solutions to successfully complete this complex urban development project. [Extracted from the article]