# Introduction
GSA provides a design postprocessor RC Slab for reinforced concrete
two-dimensional elements of uniform thickness subject to any combination
of in-plane axial or shear force and out-of-plane bending moment and
torsion. The calculations can be made following the principles of most
of the codes used within Arup. It is unable to allow for
out-of-plane shear and through-thickness forces.
The input to the postprocessor comprises applied forces and moments,
section depth, reinforcement positions, and material properties. The
reinforcement orientations can be in general directions, referred to as