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There may be a situation that it is convenient to separate a part of a main slab and specify special parameters for this part. SCIA Engineer enables the user to define various types of such a part.
A subregion is a slab defined inside the main slab. This subregion may be of different thickness, material, etc. than the main slab.
For example, a subregion may be useful to define a local thickening of the slab, to implement area load acting on a part of the slab only, etc.
Internal edge
An internal edge is a line intersecting the main slab. For example, line load may be defined along this edge.
There are other slab components available: opening, internal node, rib.
The number of subregions and opening in the main slab is not limited. Individual subregions and openings may even overlap the main region or intersect each other. The final shape is found as the intersection of all defined subregions and openings with the order of definition taken into account.
It is not possible, e.g. to insert a subregion into an opening. However, it is possible to do so if at least one edge of the subregion lies on any edge of the opening.
On the other hand, it is possible to define a main slab into an opening inserted into another main slab.