# Frequently Asked Questions (FAQ)

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• ### After entering the bearing widths in the RF-CONCRETE Members module and starting the calculation, the error message "Too much bearing width!" Appears. What can I do?

#### Answer

One of the bars adjacent to a bearing is shorter or exactly as long as the input bearing width. Please change the boundary conditions so that the rod is longer than the bearing width.
• ### I measured a wall with RF-BETON surfaces. On the outside and inside I get the same amount of reinforcement [cm² / m]. Do I have to insert A s, top + A s, below ? Or just one value (either above or below)?

#### Answer

In RF-CONCRETE Surfaces, the "top" or "bottom" position is controlled by the orientation of the area's local coordinate system.

See also the FAQ000740

This means for a wall that As, below or As, above can either be the reinforcement on the outside or inside depending on the orientation of the local z-axis.

Both values must be taken into account for the reinforcement planning.
So the sum of A s, below + A s, above .
• ### Is the offset already taken into account for the provided reinforcement, or is the length of the anchorage anchored to the longitudinal reinforcement?

#### Answer

In RF-CONCRETE Members (RFEM) or CONCRETE (RSTAB), the offset is considered by default when determining the provided reinforcement.

The difference between required reinforcement with and without offset is displayed when you open the Results navigator window:
- A s, -z (top)
- A s, + z (bottom)
- A s, -z (top), comp.
- A s, + z (bottom), comp.
display results.

In A s, -z (top), comp. and A s, + z (bottom), comp. the offset is included.
See Figure 1.

For the provided reinforcement in RF-CONCRETE Members or CONCRETE, the program considers the anchorage length for "straight" iron by default. The input can be found in the input window 1.6. See Figure 2.

The anchoring length becomes from A s, -z (top), comp. and A s, + z (bottom), comp. determines. Thus, the offset is also included here.
• ### In the program RF-CONCRETE Surfaces, there are problems with the graphical representation of the required reinforcement. This is represented unrealistically with partially higher values. The course does not match the moment course. What can I do in this case?

#### Answer

Please check the settings in screen 1.4 "Longitudinal Reinforcement" tab. If the longitudinal reinforcement for the lateral force proof is the option "Approach of the highest value from required and existing longitudinal reinforcement (basic and additional reinforcement) per reinforcement direction." set and additionally defines an existing base reinforcement, it may come in the results to a locally increased required reinforcement. The reason for this can be explained as follows: If lateral force reinforcement can be avoided by using the basic reinforcement, then the basic reinforcement is set as "required", since the results of the shear force verification result only on the assumption that the basic reinforcement is actually designed.

• ### How can I enter concrete covers of individual reinforcement layouts independently when designing reinforced concrete surfaces?

#### Answer

It is only possible to enter concrete covers of individual reinforcement layouts independently if no serviceability limit state design is performed.

As soon as you have selected a load for the serviceability limit state design in Table 1.1 in RF-CONCRETE Surfaces, the reinforcement layouts will be coupled together.

• ### Although I have defined average regions, they are not considered in the design.

#### Answer

In order to consider average regions in designs, you have to activate this option in detailed settings of add-on modules.

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#### First Steps

We provide hints and tips to help you get started with the main programs RFEM and RSTAB.

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