Tekla Structures
Tekla Structures



Concrete Detailing

Nominal diameter is the diameter used for calculating the cross section area of the reinforcing bar. Actual diameter takes into account the ribs, and tells the smallest hole diameter where the bar fits.

Values used for nominal and actual diameter are defined in rebar_database.inp, which is located in the environment folders in \<environment>\profil.

Set the advanced option to TRUE to use nominal diameter. To use the actual diameter set this advanced option to FALSE. The default value is FALSE.

When the advanced option is set to FALSE, and you open a model created earlier than Tekla Structures version 18, the center line of the reinforcing bars stays in place and the concrete cover is reduced. All bending dimensions of the reinforcing bar increase. To solve this problem, either set the advanced option to TRUE or modify the concrete covers of all reinforcing bars to the correct value.

When reinforcing bars are exported to Unitechnik, you can select to export either nominal or actual diameters. For other exports (for example, BVBS), the nominal diameter is always used in the exported definitions regardless of this advanced option.


Do not change this option during a project.

Changing the advanced option also changes the modeled reinforcing bars. This means that if the actual diameter will be used, the reinforcing bar looks thicker in the model. To accommodate for the thicker reinforcing bar, Tekla Structures will automatically change also concrete cover thickness. When you change the option, Tekla Structures changes the concrete cover values after next restart.

This advanced option is role specific. When the type SYSTEM(ROLE) is in use, the default value is used. When the type MODEL(ROLE) or DRAWING(ROLE) is in use, you can change the value, which is then the same for all users in the current model.

Was this helpful?