Types and Forms of Shell Structures

BARREL SHELL - DOMED ENDS

It was a little difficult to say exactly where the above type should be placed in this classification of shells. Finally it was included in this chapter on the theory that it was really a combination of types. The folded plate with tapered ends was included for the same reason.

Tapered ends have the advantage that the eave line can be kept the same all around the building. Less material is required because the stiffener is in domed ends. The amount of formwork is probably less but the forms cannot be moved lengthwise of the shell and must be lowered the full depth of the barrel.

A plane surface can be used instead of the curve at the end. The thickness would be greater because the bending moments are larger in the plate than in the domed shell. However, it would probably not be thicker than the vertical wall type stiffener often used at the ends of barrel shells.