Define whether two-way slabs are meshed for 3D building analysis and grillage chasedown analysis
To ensure the quickest solution time, two-way1 spanning slabs are by default not meshed for 3D building analysis or grillage chasedown analysis. In this case, the diaphragm option (none, semi-rigid, or rigid) in the slab properties determines their axial rigidity and a 3D pre-analysis process is used to decompose loads from the slabs on to supporting members. For more information about load decomposition, see: One-way and two-way load decomposition.
If you prefer, you can instead choose to mesh the slabs, either at all, or selected construction levels.
Note: Two-way spanning
slabs1 are always meshed in the FE chasedown analysis that
occurs as part of the static design process.
Use meshed two-way slabs in at all construction levels
- Go to the Project Workspace.
-
In the Structure tree, select
Levels.
- In the Properties window, select the Mesh slabs in 3D analysis option.
Use FE decomposed slab loads at all construction levels
- Go to the Project Workspace.
-
In the Structure tree, select Levels.
- In the Properties window, clear the Mesh slabs in 3D analysis option.
Use meshed two-way slabs at selected construction levels
-
In the Structure tree, expand the Levels branch.
- Click one of the desired construction levels.
- According to your needs, either select or clear the Mesh slabs in 3D analysis option.
- Repeat step 3 for all the desired construction levels.
Footnotes
1 One-way spanning slabs are also treated as two-way spanning if
Analyze slab is selected in slab item properties