By Nazanin Rezaei, Anahita Moslehian, Hanieh Gholami, Amirhossein Teymourtash & Sepideh Garivani
Tehran, with more than 12 million people is one of the most densely populated cities in the world that is increasingly occupied by immigrants. In last three decades, several residential complexes have been constructed to solve this problem. But there is still disorganized housing problem in the edges of the city.
We have strategically selected the "Ekbatan Town", a high rise community in the west of Tehran as our scenario location due to its high urban density of buildings. Since its first construction, in 1975, two more phases have been spawned. Today, the self-contained neighborhood is home to more than 45000 people with two metro stations, two markets, and three mosques. It has its own schools, a hospital and a host of other amenities. The building structure, geometry and urban infrastructures make this town extensible in order to place additional population in near future.
Our proposal for extending residential units atop current buildings consists of a hanging wooden (Kerto® LVL) structure with a network of cables that hold lightweight wooden cubes suspended. Given that the earthquake risk in Tehran, our project proposes a self-static structure that works independent of existing building. The empty spaces between wooden colonies (that consists of numbers of residential units) have been considered to allow structure shake freely in the event of earthquake.
The main vierendeel structure has been made of wooden timbers and metal plates. 25x25x50 m3 three dimensional structure provides the efficient space for hanging the residential colonies those are made of Metsa Wood products (The dimensions selected due to the Metsa wood timbers maximum length of 25m).
We considered the 8x8x9 m3 spatial module and wooden cubes have been placed in 1.5, 2 and 3 modules. The maximum length of floors and roofs are not more than 18 m according to Kerto-Ripa roofs and floors technical information. Each of colonies have 3 floors and are tightened by cables to hang from vierendeel structure and place atop the existing building.
The selected site has a large area of lost spaces including roofs and lawns. Therefore, we aim to redefine the roof platforms to the green terraces that shared with the existing and new residential units as the semi-private garden. As such, we plan to implement a tree farm instead of large area of useless lawn that will extract toxins from the soil as well as carbon dioxide from Tehran’s air. It can reduce carbon footprint of the renovation over the years and provide raw material for future extensions.