This dialog can contain padlocks 
depending on the properties of the elements you have selected. Read all about the padlocks in this article.
By default, all the surfaces (= slabs, plates, walls) are assumed to be continuous. Meaning, all internal forces can be transferred between them. The dialogue below is used to assign boundary conditions to the edges of all types of surfaces, thus slabs, plates, walls. But for simplicity we talk about “plates” and “plates edges” in this article.
To change the boundary conditions for a border of a surface:
- Select the relevant plate edges.
If you want to select more than one plate edge, keep the SHIFT-key pressed in while you select.
If you want to apply the boundary conditions to all plate edges or to walls, skip this step. - Select the plates while keeping the SHIFT-key pressed in.
- Click on
.
Bottom part (Defined by user)
The bottom part contains options that are mainly used for slabs and plates.
Depending on the selection, one of the following dialogues appears
Unselected edges to which boundary conditions have already been assigned, are drawn in blue.
Selected edges to which no boundary conditions have been assigned yet, are drawn in red.
Selected edges to which a boundary condition has already been assigned are red inside and blue outside.
Using the drop-down menu in the middle of the dialogue, you can indicate to which elements you want to apply the boundary conditions:
- to all the edges of the selected plate
- only to the selected edges of the selected plate.
- Either you select the relevant edges before opening this dialogue .
- Either you open this dialogue and you click on the edge to which you want to assign the boundary condition. The black drawing area in Options B & C (see above) is interactive.
You can select multiple edges using the SHIFT-key.
Click somewhere outside the plate perimeter to cancel the selection.
- Either you select the relevant edges before opening this dialogue
- to all horizontal edges of the selected plate
- to all vertical edges of the selected plate. This option is only relevant for vertical walls.
Click on 
to clear all settings.
Top part (‘No moment transfer along all edges’)
The top part contains options that are mainly used for (masonry) walls.
The quick buttons represent a combination of activate some the options above and below:
| no out-of-plane moment | no in-plane moment | no tension at top border | no arch effect | |
|---|---|---|---|---|
 | þ | |||
 | þ | þ | ||
 | þ | |||
 | þ | þ | ||
 | þ | þ | þ | |
 | þ | þ | þ | |
 | þ | þ | þ | |
 | þ | þ | þ | þ |
- No moment transfer along all edges
The plate will not be able to transfer bending moment out of the plane along any plate edges. - No in-plane moment
The plate will not be able to transfer bending moment in the plane of the plate along any plate edges. - At top border: no tension
This option prevents a floor resting on a wall from pulling on the wall along the top edge.
However, this option does not exclude tension from occuring in the field of wall! This option only applies to the top edge.
This option will always result in an iterative calculation and convergence is not guaranteed. - No arch effect
This makes the wall act like a one-way vertical plate.
More information on masonry behaviour in this article.
Click on to clear all settings.
