In 30 St Mary Axe, every floor is different. The span and orientation of the floors and the angle at which they meet the walls vary throughout the building. This makes it an exciting building to experience, but created some unusual design challenges.
To simplify construction, Arup designed 360° steel nodes to connect the complex diagrid together. The nodes consist of three steel plates, welded together at different angles. The connections helped to make the diagrid straightforward and cost-effective to build.
The diagrid itself consists of intersecting tubular steel sections that follow the curvature of the building and provide vertical support to the floor, giving the additional benefit of column-free office space. As well as structural support, the diagrid provides the building with resistance to buffeting from the wind.
Arup used extensive 3D computer modelling to determine the sizes of the steel frame. A 3D model of the structure helped the architect to co-ordinate the overall design. It also enabled the steel contractor to generate the information needed to produce the 10,000 tonnes of steel in the buildings, 2,500 tonnes of which make up the diagrid structure. This helped to make the process of going from drawing board to fabrication as simple as possible.
In 30 St Mary Axe, every floor is different. The span and orientation of the floors and the angle at which they meet the walls vary throughout the building. This makes it an exciting building to experience, but created some unusual design challenges.
To simplify construction, Arup designed 360° steel nodes to connect the complex diagrid together. The nodes consist of three steel plates, welded together at different angles. The connections helped to make the diagrid straightforward and cost-effective to build.
The diagrid itself consists of intersecting tubular steel sections that follow the curvature of the building and provide vertical support to the floor, giving the additional benefit of column-free office space. As well as structural support, the diagrid provides the building with resistance to buffeting from the wind.
Arup used extensive 3D computer modelling to determine the sizes of the steel frame. A 3D model of the structure helped the architect to co-ordinate the overall design. It also enabled the steel contractor to generate the information needed to produce the 10,000 tonnes of steel in the buildings, 2,500 tonnes of which make up the diagrid structure. This helped to make the process of going from drawing board to fabrication as simple as possible.
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