STAAD.Pro Help

D. EC2 2004 Slab Design Brief dialog

The EC2 2004 Slab Design Brief has the following tabs for setting out the design parameters:

General tab

Minimum Cover These set the cover to the top and bottom of the slab.
Aggregate Size Aggregate size sets the maximum size of aggregate.
Concrete Grade

Either select a standard grade from the pull-down list or enter the concrete cube strength into the user value.

Available concrete grades include: C30, C35, C40, C45, and C50


The slabs will be designed to the forces from the envelope selected from the pull-down list.  Load Envelopes are added using the Define Envelope dialog.

Note: Top and bottom of slabs are defined by the local axis of the constituent elements.

It may or may not relate to the physical top or bottom of the slab. In order to eliminate any mismatch or confusion, please ensure that all local axes of constituent elements point in the positive y direction of the global coordinate axis.

This ensures consistency of element orientation and alignment of top and bottom of slabs with local axes.

Main Reinforcement tab


There are two ways to carryout slab design. You may set fixed bar spacing and let the program calculate acceptable bar sizes to suite or, fix the bar size and calculate acceptable bar spacing.

Main Bar Type

Specify the strength of steel to be used for the main bars either from the available steel grades (S500 or S400) or by specifying the steel yield strength to be used (in N/mm2).  If a user strength is defined, then the appropriate bar bending dimensions need to be specified.

Select the reinforcement Class as either A, B, or C. Reinforcement class is based on Table C.1 of EN 1992-1-1:2004

Top/ Bottom Bar Criteria.  

Set the outer bar direction for reinforcement to follow the ‘X’ or ‘Y’ axis of the slab.

Set the Bar Size for ‘X’ and ‘Y’ directions.

Set bar Spacing in the ‘X’ and ‘Y’ direction if design is based on fixed bar size.

National Annex tab

Used to select a Eurocode 2 National Annex, if necessary, and open a dialog for editing National Annex parameters.

Country Sets the country for which you want to use the National Annex. Select EC2 without Annex to use the EC2 code with no national annex changes or additions or to specify custom national annex values.
Edit button

Opens a dialog for editing national annex values. The dialog opened is dependant on the selected Country option.

  • UK National Annex - Opens the dialog box, which is used editing EC2 values as directed by the UK National Annex.
  • EC2 without Annex - Opens the dialog box, which is used to specify general National Annex values.