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In this tutorial we use isoparametric quad4 elements to model the sheet pile. Isoparametric elements primarily calculate stresses, so that forces and moments are not directly available. To get the forces and moments in the sheet pile, a post calculation is needed. The following post_calcul commands perform this calculation:
post_calcul -groundflow_pressure -total_pressure -materi_stress -force
post_calcul_materi_stress_force_element_group sheet_pile_group
post_calcul_materi_stress_force_reference_point 100 4.
The post_calcul -materi_stress -force tells Tochnog that is should calculate forces and moments from initially calculated stresses. The group for which this should be done is specified by post_calcul_materi_stress_force_element_group sheet_pile_group. Finally, it is needed to specify a reference point for drawing plots in GID, so that positive and negative vectors for forces and moments are drawn in a unique manner.