In the planning process it is helpful that rectangular glass panels under uniform loading can be designed very fast. Furthermore it is important to check the results of a FE calculation.

A calculation of many different discretely supported glass panels under an uniform load with the value q=1,0 kN/m² with the help of the FE method results in values of stresses and deformations. The insertion of these values in a 3D-diagramm, results in a surface of results of stresses or deformations. For a pre-design this paraboloidal shell is exact enough. A linear interpolation in this surface is very easy.

With a short number of input data, such as the distance in direction length, the distance in direction across or the thickness of the glass panel, it is possible to interpolate the results of stress in this shape. The interpolation results must be calibrated with other influences for example with the diameter of the the hole and the distance of the hole to the edges and with the shore hardness of the rubber at the support.