To verify the mathematical model of ELPLA for analyzing grid foundations, the results of grid foundation on elastic springs obtained by Szilard (1986) (Example 4.4.5, page 350) are compared with those obtained by ELPLA.

The geometry and the loads of foundation are the same as those of Szilard (1986) as shown in Figure 21. The grid has rectangular cross section of 2.5 [m] width and 0.5 [m] depth, yields Moment of Inertia I = 0.026 [m⁴] and Torsion modulus J = 0.091 [m⁴]. The parameters of grid material are Young's modulus E_b = 3 * 10 [kN/m ] and Shear modulus G_b = 1 * 10 [kN/m ]. Modulus of subgrade reaction of the soil is k_s = 40 000 [kN/m ].