How does Floor Pro determine effective depth for two-way slabs in each direction?
When a support line is tagged as “Two-way Slab” the program determines the CGS as follows:
For Top and Bottom bars at outer layer: Cover (as defined in Criteria) + 1/2* outer bar diameter
For Top and Bottom bars at inner layer: Cover (as defined in Criteria) + outer bar diameter + 1/2 inner bar diameter bar
If you double-click on any support line and go to the “Design” tab you have the option (for two-way slab designated support lines) to define the design based on outer layer or inner layer for top and bottom bars. By default all support lines in the X and Y directions are designated as “outer layer” for top and bottom. Our recommendation is to define X direction as “outer layer” and change Y direction to “inner layer” to account for the different depths in analysis.
Note: Inner and outer bar diameters are the same for top or bottom