In its static functionality the resulting system is equivalent to a two-hinged arch.

The static scheme of the double-skin arch shows a system of two concentrically situated traverses with radial bars as spacers.

The horizontal forces emerging from surcharge must be compensated by tie rods. Normally they are arranged along the longitudinal profile of the supports, with a spacing of 2-3m. Together with the longitudinal profile of the support and the tie rods the arch forms a closed system that does not produce external horizontal forces in case of vertical surcharge.

The horizontal loads emerging from suction loads may be taken by pressure profiles or by the substructure.