Theory of shell structures
Shells can be defined as curved structures capable of transmitting loads in more than two directions to supports.
Shells can be defined as curved structures capable of transmitting loads in more than two directions to supports. Loads applied to shell surfaces are carried to the ground by the development of compressive, tensile, and shear stresses acting in the in-plane direction of the surface. A shell structure is a thin curved membrane or slab usually of reinforced concrete that functions both as structure and covering.
The term “shell” is used to describe the structures which possess strength and rigidity due to its thin, Natural and curved form such as the shell of an egg, a nut, human skull, and shell of a tortoise.
A concrete shell, also commonly called thin-shell concrete structure, is a structure composed of a relatively thin shell of concrete, usually with no interior columns or exterior buttresses. The shells are most commonly flat plates and domes, but may also take the form of ellipsoids or cylindrical sections, or some combination thereof. Concrete shells are always cast as a monolithic dome. Thickness of shell is too small as compared to the other two dimensions. It may be from 40 mm to 150 mm. deformations are not large as compared to thickness.
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