Deformations, reactions, contact stresses
Deformations, reactions and contact stresses in joints are the results of calculations, that are considered as accurate. Other values are calculated using these results as inputs.
Deformations
Joints deformations are the fundamental results of calculation. All other results like reactions, internal forces and contact stress are calculated with the help of these values.
The program displays the diagrams of deformation for members or structure. The exact values along members are displayed in positions of relative joints or in inflexion points. If the user is interested in finding the exact value of the deformation in a specific point, it is necessary to insert a relative joint into this position. Such procedure is also important on members with free or spring end conditions.
Reactions
The program calculates reactions induced by loading for all degrees of freedom in joints, that are replaced by the external support. Supports may be rigid or spring ones. Reactions can be forces (for movements fixed by an external support) and moments (for rotations fixed by an external support).
Contact stresses
Contact stress is similar to reactions in external supports. It is the pressure which is transmitted from the structure to the subsoil and it is necessary to ensure that the subsoil is able to resist these stresses.
Contact stress is calculated from the displacements perpendicular to the subsoil and from the rotation in the plane perpendicular to the contact area about the axis perpendicular to the member axis. Calculation is based on deformations at nodes. And thus the stress is calculated in nodes and linear distribution is considered between nodes. It means that the denser division of member will be used, the more accurate results will be obtained. The oation of node may cause the discontinuity of results (stresses on the left and right sides of the node aren't equal). The average value should be considered in these cases. This inaccuracy can be reduced significantly by higher density of nodes for members on subsoil.