FOLDED PLATE AND CONE
The cone on the ends of the folded plate finishes off an otherwise angular structure with a curved façade and might have some architectural applications where a bay window effect is required. The cone can hardly be said to have enough stiffness to replace the rib that is otherwise required at the columns. This cone acts like a curved folded plate rather than as a dome.
A similar structure is a dome of revolution used on the end of a curved barrel shell to provide a circular rotunda.