The elements of a folded plate structure are similar to those of a barrel shell except that all elements are planar, and the moments in the slab elements are affected by the differential movement of the joints.
For the structure shown, the end supports and the side supports are both complete walls
The elements of a barrel shell are:
(1) The cylinder,
(2) The frame or ties at the ends, including the columns, and
(3) The side elements, which may be a cylindrical element, a folded plate element, columns, or all combined.
For the shell shown in the sketch, the end frame is solid and the side element is a vertical beam.
A barrel shell carries load longitudinally as a beam and transversally as an arch. The arch, however, is supported by internal shears, and so may be calculated.
The elements of a folded plate structure are similar to those of a barrel shell except that all elements are planar, and the moments in the slab elements are affected by the differential movement of the joints.
For the structure shown, the end supports and the side supports are both complete walls