Data part, post processing and printing

post_point 0 3.0 6.75
post_node 0 -node_rhside -sum -beam_point
post_calcul -groundflow_pressure -total_pressure
print_gid_contact_spring2 1

To obtain exactly at point A information about the solved solutions fields (displacements, stresses, etc), we specify post_point 0 at 3.0 6.75. Tochnog will then automatically find out where in the FE mesh this post point is located, and calculates there the solution field by interpolating results from the specific element in which the post point is located. These results will be placed in the record post_point_dof, which in turn is available in the database after the calculation, or can be printed with control_print or control_print_data_versus_data during the calculation.

The post_node 0 record sums the node_rhside record on all nodes present in the geometry beam_point, so in this case we directly get the node_rhside record at the node located at point A. The node_rhside contains for nodes with prescribed velocity (or displacement) the external reaction force on the prescribed node (for the positions in the node_rhside record that matches the velocity unknowns, so position 0 and 1 in this calculation, see dof_label in the database after the calculation). The result for post_node 0 will be placed in the record post_node_result 0, which again can be viewed in the database after the calculation or printed during the calculation.

Similar to the dam calculation in tutorial 2 we need a post_calcul -groundflow_pressure -total_pressure.

Finally, with print_gid_contact_spring2 1 we require that Gid plots the contact springs as one-node elements, even if they are in the calculation really two-node elements; this is done because Gid draws two-node elements with their length, and since the length of the contact springs is 0 the contact springs would become invisible when drawn with two nodes.