A structure which has a curved surface that resists loads through tension compression, and
shear in the plane of the structure only. Theoretically, there are no bending or moment
stresses in this structure. The material is practically always reinforced concrete from about 75
mm. to 150 rrim. The forms can be domes, parabolas, barrel vaults that span from 12 M. to
over 60 meters and the complexed shape of the saddle-shaped hyperbolic paiaboloid that
spans from 9 M. to 48 meters.