Description
Name
This is a read-only value.
Structural Usage
Analytical Model
The plane of the slab used for analysis and design.
Analytical Projection Plane
Foundation Slabs
The Foundation Slab type has three more foundation-specific values than a regular slab has. These additional
values, which are instance parameters displayed in the Element Properties dialog, are: Width, Length, and
Elevation at Bottom. Using these values, an analysis tool can distinguish between a standard slab and a
foundation slab.
Foundation Slabs may be used to model slabs on a grade, which do not require support from other structural
elements. Foundation Slabs may also be used to model complex foundation shapes that cannot be created
using Isolated or Wall Foundation tools.
Adding Foundation Slabs
1
On the Structural tab of the Design Bar, click Slab. You can also click Modelling
menu
➤
Structural
➤
Foundation
➤
Slab.
2
Sketch the foundation slab in the same manner as a regular slab: either by using lines, picking
supports, or picking walls.
3
When you finish sketching, click Finish Sketch. The foundation is placed in the project.
4
Click the foundation, and select the desired Foundation family type on the Family drop-down
list.
NOTE
Foundation slabs are added below the level in which they are drawn. Therefore, if you add a
foundation slab in Level 1, it is added below Level 1 and will not be visible in the Level 1 plan view.
To see the foundation slab in a plan view, create a new level below Level 1, for example, Foundation
Level. When you create a new level below Level 1, you will also be able to see the foundation slab as
an underlay (greyed out) in Level 1.
Foundation slab below foundation level
878 | Chapter 12 Working with Structural Components
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