# Soil rectangular loads
Normally in a raft analysis the load on the soil is from the structure, but additional soil loads can be specified. These act in addition to the raft loading.
# Definition
Name
This is just used to make it easier to identify a soil load
**Loading plane orientation **
The orientation of the loading plane. A load in the vertical plane and no rotation angle is in the XZ plane.
Angle of local x from global X
Define the rotation angle of the load about the global z axis.
Centre of loaded area
The coordinates of the centre of the rectangular loading area (x, y, & z in global axis).
Width x
The width of the area in local x.
Length y
The length of the area in local y.
Load values in normal and tangent directions
- Normal load in local z direction.
- Tangent load in local x direction
- Tangent load in local y direction
Note that the soil loads follow the PDisp convention:
| Loading plane orientation | Angle of local x from global x | Global direction of local z load (normal) | Global direction of local x load (tangential) | Global direction of local y load (tangential) |
|---|---|---|---|---|
| Horizontal plane | 0 | -Z | X | Y |
| Vertical plane | 0 | -Y | X | -Z |
| Vertical plane | 90 | X | Y | -Z |