The standard penalty method is recommended for modeling of a contact between plates. If penetration of a node into an opposite contact surface is detected, penalty stiffness is added between the node and the opposite plate. The penalty stiffness is controlled by a heuristic algorithm during the nonlinear iteration to get a better convergence. The solver automatically detects the point of penetration and solves the distribution of contact force between the penetrated node and nodes on the opposite plate. It allows creating contact between different meshes as shown. The advantage of the penalty method is the automatic assembly of the model. The contact between the plates has a major impact on the redistribution of forces in connection.
An example of separation of plates in contact between the web and flanges of two overlapped Z sections purlins
It is possible to add contact between
- two surfaces,
- two edges,
- edge and surface.
An example of edge to edge contact between the seat and the end plate
An example of edge to surface contact between the lower flange of the beam and the column flange
The stresses in contacts may be visualized and the values are shown in the check table of plates. However, the contact stresses are only informative and are not used in any check. Also, the through-thickness stress of shell elements is not considered.