Researchers from eth zurich have built a prototype of an ultra thin curved concrete roof using innovative digital design and fabrication methods.
Concrete shell roof structure.
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The first concrete shell dates back to the 2nd century.
Queen post roof truss.
The structure is a reinforced concrete shell so it will have some minor imperfections from the original construction weak spots from existing penetrations loads already added degradation of material strengths over time and various considerations.
Of course a concrete roof requires more support than a typical wooden roof.
In order to assure that the concrete shell structure will develop its full capability to resist the imposed destructive forces it is essential that the roof structure provide a competent structural diaphragm incorporating a cast in place reinforced concrete slab or well connected precast concrete planks in order to develop the full potential of a concrete shell.
Thus they are widely used in roofs of large spans.
These have to be factored into the analysis in order accurately to reflect its true state.
The innovation of thin shell concrete roofing at jena was made possible by the use of a geodesic structure of precisely cut iron rods that reduced the weight of the roof on load bearing walls as.
A shell structure is a thin curved membrane or slab usually made up of reinforced concrete which can function both as a roof covering and structure.
Interior support beams can help but the construction works best when concrete walls floor and roof form a solid shell.
Concrete weighs a lot and the outside walls have to be capable of supporting the giant slab.
Shell roofs typically composed of concrete panels curved cylindrically or spherically to achieve greater strength.
The shells are most commonly flat plates and domes but may also take the form of ellipsoids or cylindrical sections or some combination thereof.
The shells arise from the association between concrete and steel and are structures whose continuous curved surfaces have a minimal thickness.