FOLDED PLATE AND SLA
It is intended in this structure to have a center row of columns so that the greatest depth is at the point of maximum moment and the shear and bending moment at the outside edges are low. A stiffener will be required at the center row of columns. However, the slab acts as its own stiffener. The slab thickness might be somewhat thicker than the shell but as soon as the total depth of the shell became sufficient to resist the stresses, the thickness could be reduced.