A folded plate structure is formed when several flat plates are
joined at the edges and are supported by end dlaphrams. This, of course,
is the simplest case because it Is possible to have intermediate dlaphrams
and have continuous spans. In the development of the Primary Theory the
following plate configuration was used by Winter and Pel: The basic theory assumes that since an individual plate is long and
thin it is capable of only two modes of structural participation which
are designated as slab action and plate action e.g.
It