I have designed a wall with a basic reinforcement (diameter 12 mm, distance 15 cm, the same inside and outside). This would result in an existing basic reinforcement of 7.54 cm²/m per side. However, the module shows only half (3.77 cm²/m) as an existing base reinforcement on the inside or outside. Why?


You have probably entered the wall as a 2D model.

Figure 01 - Dialog Box with the Model General Data and Setting of the Model Type

If you enter the wall as a 2D model, you can only enter a symmetric reinforcement on the inside and outside in RF-CONCRETE Surfaces.

In the input dialog 1.4 of RF-CONCRETE Surfaces, you will find only one reinforcement layout, in which "top" and "bottom" are summarized.

Now, if you specify a reinforcement of 7.54 cm²/m in a 2D model, you get an available basic reinforcement of 3.77 cm²/m in the result table 2.1, since RF-CONCRETE Surfaces applies a half inside or outside.

If you now want to consider a reinforcement of 7.54 cm²/m per wall side, you have to directly specify a reinforcement of 15.08 cm²/m for a 2D model.

This would result in the desired reinforcement of 7.54 cm²/m per side.

If you enter a 3D model instead of the 2D model (setting in the model's general data, see Figure 01), you can enter the settings for the top and bottom part of the surface separately in RF-CONCRETE Surfaces.


Wall Reinforcement Basic reinforcement


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RFEM Main Program
RFEM 5.xx

Main Program

Structural engineering software for finite element analysis (FEA) of planar and spatial structural systems consisting of plates, walls, shells, members (beams), solids and contact elements

Price of First License
3,540.00 USD
RFEM Concrete Structures

Add-on Module

Design of reinforced concrete members and surfaces (plates, walls, planar structures, shells)

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810.00 USD