The shell emerged as a major long span concrete structure after world war ii.
Shell roof construction details.
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Columns beams walls etc.
Multi barrel shells often contain arrangements of different sized arches and are often used in public works buildings.
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Shell construction began in the 1920s.
They are usually constructed of concrete reinforced with steel mesh see shotcrete.
Shell roofs are built with several materials such as in situ reinforced concrete timber steel sheets ceramics glass plastics hard board lattice and composite structure etc.
Shell roofs can be flat but are typically curved assuming a cylindrical domed paraboloid or ellipsoid shape.
The single barrel shell multi barrel shell and the continuous barrel.
There are three main types of shell roof.
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A single barrel shell looks like a long arch and is used in long rectangular structures such as airplane hangars.
The curvature of shell structures benefits from the same structural efficiency as arches which are pure compression forms with no tensile stresses.
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Moreover shell roof is three dimensional structures consisting of thin membrane slabs curved in one or more directions which transfer the loads on points of support i e.
Continuous barrel roofs are used on large structures such as airports that require multiple shells to cover the floor space.
Shell roof is basically the modification of a pitched roof and covers large areas of the building.
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