Manual Arrangement of Surface Reinforcement

Technical Article

As an alternative to the conventional automatic arrangement of surface reinforcement in RF‑CONCRETE Surfaces, it is also possible to set it according to the individual requirements. For example, this can be useful when creating reinforcement drawings as the reinforcement areas are clearly defined and also include dimensions.

Activating Manual Definition of Reinforcement Areas

You can switch to manual definition of reinforcement areas by clicking the [Details...] button in the RF‑CONCRETE Surfaces add‑on module. In the ‘Reinforcement’ tab, select the option ‘Manual definition of the reinforcement areas’.

Subsequently the ‘Provided Reinforcement” section appears instead of ‘Additional Reinforcement for Serviceability State Design’ in Window 1.4 Reinforcement.

Figure 01 - Activating Manual Definition of Reinforcement Areas

Entering Reinforcement

The reinforcement definition is described in the example of rectangular reinforcement. The other reinforcement types can be created in the same way. The surface reinforcement always refers to the total area, while the rectangular, polygonal and circular reinforcement usually applies to partial surfaces.

After activating the rectangular reinforcement by selecting the corresponding option, you can click the [Apply free rectangular reinforcement] button to open the ‘New Rectangular Reinforcement’ dialog box.

Figure 02 - Dialog Box ‘New Rectangular Reinforcement’

In this dialog box, the reinforcement properties and layouts are defined. Among others, you can also define on which surfaces the reinforcement should apply. If the ‘All in RG’ option is selected, the reinforcement is applied to all surfaces. This option is especially useful when there are several slabs with the same geometry and loading.

In the ‘Type of Reinforcement’ section, you can select whether mesh or rebar reinforcement should be created.

The ‘Layout of Reinforcement’ section includes the options for specifying the slab side as well as the direction of surface reinforcement. You can optionally select a concrete cover. In this case, the data are imported from the ‘Reinforcement Layout’ tab.

When defining the ‘Reinforcement Position’ by using the coordinates, you should make sure that the position corresponds with the FE mesh. Once the rectangle surrounds the centre point of the element, the reinforcement is created for the entire element.

The values of the reinforcement surfaces lying next to each other will be added to the relevant element. As soon as the reinforcement is defined, you can open the corresponding table by clicking the [Edit...] button. This table provides an overview of the defined reinforcement surfaces which can be further edited.

Figure 03 - [Edit] Button

The table includes the copying and filtering functions to easily and clearly manage the already entered reinforcement. You can always check the specific entries by simultaneous synchronization which only displays the selected reinforcement.

Figure 04 - ‘Rectangular Reinforcement’ Table with Synchronization

Checking Reinforcement Covering

After the reinforcement has been entered successfully, you can check the covering of the required reinforcement in the Results navigator. On the other hand, you can use the ‘Not Covered Reinforcement’ option to quickly check in which areas the reinforcement is still insufficient.

Figure 05 - As,req / As,prov

The dark red areas in Figure 05 are not reinforced sufficiently yet.

Dimensioning Free Reinforcement

Free reinforcement can be easily dimensioned by using the ‘Linear Dimension’ function. In the corresponding dialog box, it is necessary to select the ‘Generate help node’ option. Otherwise, the free reinforcement cannot be captured. Now, you can create nodes on the relevant points, which will then be dimensioned.

Figure 06 - Dimensioning

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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

RFEM Concrete Structures
RF-CONCRETE 5.xx

Add-on Module

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