Case Study: Maison a Bordeaux

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MAISON A BORDEAUX

Bordeaux, France

Architect: OMA, Rem Koolhaas Location: Bordeaux, France Client: Family (husband, wife, 3 children) Year of Completion: 1998 Engineer/Consultants: Ove Arup A wealth French family wanted a new house, but their simple dream was disrupted when the father got into a car accident, which landed him in a wheelchair. The house now had to accommodate his physical limitations and provide a stimulating environment that would “define his world.� Koolhaas proposed a design of three vertically stacked houses connected by a lift, functioning as an office, for the father. This movable room connects with each floor to complete the space and leaves a void in its wake. The bottom house, carved into the hillside, contains private family living space and opens towards the courtyard. The top house, a concrete mass, is punctured to provide pre-picked views from the bedrooms. The middle house is sandwiched between the two masses and creates an infinite space by connecting with the seroundings through minimized structural obstructions.

East - West Section

Photo(s)

West Facade: Driveway and main entrance. Note structural beam and tension cable.

Structural Diagram

South - North Section

Top house

Description of Structural System In order to achieve this open middle house beneath the closed and massive top house, Koolhaas, together with Arup and Partners, devised a cantilevered system which minimized the number of structural components. This minimalist support system consists of four main elements: an aluminum cylinder, a large I-beam, a thin cable, and a U-shaped steel member. Middle house

The cylinder, which contains the staircase, supports the west end of the building. It is offset to the north, creating a need for a structural counterpart to balance the cantilever. The designers choose not to add a fourth compressive leg, but instead to counter act the weight of the cantilevered structure through the use of a cord in tension on the same side as the compressing cylinder. Through an I-beam, attached to the cylinder, the weight of the cantilever is channelled to the tensile cord, which then pulls on a concrete block sunken into the earth. The U-shaped steel member supports the east end of the structure. This is composed of two columns attached to a beam through moment connections.

Bottom house Page 1

This structural system has three legs which act in compression, pushing on the earth. These three legs would work as a tripod, but due to the placement of the cylinder, the legs do not balance the weight of the building. The introduction of the cable pulls the entire building into balance, making this smallest member the keystone of the structure. Christine Hoff & Karen Costello ARCH 150 | Case Study


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Case Study: Maison a Bordeaux by Karen Costello - Issuu