The bus-shelter canopy “Parapluie”, designed for serial production, consists of an extremely thin fair-face concrete shell entirely devoid of built-in steel elements with a plate depth of only 2.4cm at its edges. A tipped conical-shaped element provides support at a single point, located away from the centre of the shell. The decision was taken to employ asymmetry in combination with dynamic three-dimensional free forms, developed and optimised using a parametric computer program. The aim was to create a roof element as thin and light as possible, yet one with an excellent load-bearing capacity. By means of a parametric shape-finding process, a system was developed that allows loads to be distributed almost exclusively within the tensile surface of the membrane – like a rolled-up piece of paper in one’s hand. The clue to this was selecting the right materials: a micro-reinforced high-performance concrete with stainless steel reinforcement equally distributed over the cross-section. This material offers the greatest possible ductility and has excellent load-bearing capacity, allowing an approximate linear elastic analysis of the supporting structure. The design development work was carried out in close cooperation with the engineers Bollinger+Grohmann and DUCON Europe.
Technical details:Typology: Transport infrastructure buildings, Design/Object
Procurement documentation: Feasibility study