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004846
Clemens Gutmann
2024-03-28

FAQ 005472 | In the table of the objects to be designed in the Concrete Design add-on, punching nodes are...

FAQ 005472

Question:
In the table of the objects to be designed in the Concrete Design add-on, punching nodes are listed in the not valid/deactivated column, although I have defined them as punching nodes. How can I fix this?

Answer:
There can be several reasons for this error.

► Image | Not Valid / Deactivated Punching Nodes https://www.dlubal.com/en/img/048363

Missing Surface Reinforcement

In the surface with the punching nodes is no reinforcement available.

► Image | Missing Surface Reinforcement https://www.dlubal.com/en/img/048364

You can find out how to create surface reinforcement here: Surface Reinforcement

Missing Dimensions

In RFEM 6, the geometry of punching nodes is usually determined using the cross-section of the connected structural component (wall, column). If a slab or a plate is designed separately within a 2D positional analysis and thus no walls or columns in the form of surfaces or members exist in the model, RFEM cannot automatically determine the structural component dimensions. Instead, you have to specify the dimensions manually:

Not Supported Nodes

In the case of punching nodes that are not supported by a nodal nor linear support, the dimensions of the connected components can be defined via the ultimate configurations.

► Image | Missing Dimensions – Not Supported Nodes https://www.dlubal.com/en/img/048365

More information can be found here: Ultimate Configurations (Punching)

Supported Nodes

In the case of punching nodes that are supported by a nodal nor linear support, which represent a connected component, you can specify the dimensions in the support settings.

► Image | Missing Dimensions – Supported Nodes (Nodal Supports) https://www.dlubal.com/en/img/048366
► Image | Missing Dimensions – Supported Nodes (Line Supports) https://www.dlubal.com/en-US/img/048367

More information can be found here:
Fictitious Columns (Nodal Supports) | Fictitious Wall (Line Supports)

Not Valid Nodes

In the punching nodes are located in the middle of a line load or a line support, no punching shear occurs. Therefore, these nodes are indicated as not valid.

► Image | Not Valid Nodes https://www.dlubal.com/en-US/img/048368

Tip

After calculating the results for the Concrete Design add-on, the error messages for invalid punching nodes are displayed in the table.

► Image | Error Messages Overview https://www.dlubal.com/en/img/048369

Events
2024-04-30
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Models to Download
Model 004852 | Pedestrian and Cyclist Bridge in Eichstätt, Germany
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Model 004788 | Bleachers
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Knowledge Base Articles
Steel Fiber-Reinforced Concrete Slab
Using an example of a steel fiber-reinforced concrete slab, this article describes how the use of different integration methods and of a different number of integration points affects the calculation result.
Spans Based on Figure 5.2 from [1]
In order to correctly design a downstand beam or a T-beam in RFEM 6 using the Concrete Design add-on, it is essential to determine the flange widths for the rib members. This article describes the input options for a two-span beam and the calculation of the flange dimensions according to EN 1992-1-1.
KB 001825 | WebService & API for Analysis of Construction Stages
When calculating regular structures, data input is often not complicated but time-consuming. Input automation can save valuable time. The task described in the present article is to consider the stories of a house as single construction stages. Data is entered using a C# program so that the user does not have to enter the elements of the individual floors manually.
KB 001838 | Design of Ribs, Folded Plate Structures, and Surfaces Using Result Members
If you want to use a pure surface model, for example, when determining the internal forces and moments, but the structural component is still designed on the member model, you can take advantage of a result beam.
Screenshots
Model 004864 | Steel Structure Connection | AISC 360-22
Model 004864 | Steel Structure Connection | AISC 360-22
RFEM Model of Palazzo Meridia Office and Retail Building in Nice, France
RFEM Model of Palazzo Meridia Office and Retail Building in Nice, France | © Architecture-Studio
Model of Markas Headquarters, Italy
Model of Markas Headquarters, Italy | © ATP/Bause
RFEM Model of Pedestrian and Cyclist Bridge in Eichstätt, Germany | © Bergmeister Ingenieure
RFEM Model of Pedestrian and Cyclist Bridge in Eichstätt, Germany | © Bergmeister Ingenieure
RFEM Model of Pedestrian and Cyclist Bridge in Eichstätt, Germany | © Bergmeister Ingenieure
RFEM Model of Pedestrian and Cyclist Bridge in Eichstätt, Germany | © Bergmeister Ingenieure
Model 004386 | Multistory Reinforced Concrete Building | CSA A23.3:19
Model 004386 | Multistory Reinforced Concrete Building | CSA A23.3:19
Design Level 2 – Design Setting
Design Level 2 – Design Setting
Design Level 1 – Design Setting
Design Level 1 – Design Setting
The Concrete Bridge in RFEM 6
The Concrete Bridge in RFEM 6 | Webservice and API
Product Features
Feature 002670 | Fatigue Design According to EN 1992-1-1, Chapter 6.8

With the Concrete Design add-on, you can perform the fatigue design of members and surfaces according to EN 1992‑1‑1, Chapter 6.8.

For the fatigue design, you can optionally select two methods or design levels in the design configurations:

  • Design Level 1: Simplified design according to 6.8.6 and 6.8.7(2): The simplified design is performed for frequent action combinations according to EN 1992‑1‑1, Chapter 6.8.6 (2), and EN 1990, Eq. (6.15b) with the traffic loads relevant in the serviceability state. A maximum stress range according to 6.8.6 is designed for the reinforcing steel. The concrete compressive stress is determined by means of the upper and lower allowable stress according to 6.8.7(2).
  • Design Level 2: Design of damage equivalent stress acc. to 6.8.5 and 6.8.7(1) (simplified fatigue design): The design using damage equivalent stress ranges is performed for the fatigue combination according to EN 1992‑1‑1, Chapter 6.8.3, Eq. (6.69) with the specifically defined cyclic action Qfat.
Feature 002671 | Seismic Design of Reinforced Concrete Members According to EC 8

The Concrete Design add-on allows you to perform the seismic design of reinforced concrete members according to EC 8. This includes, among other things, the following functionalities:

  • Seismic design configurations
  • Differentiation of the ductility classes DCL, DCM, DCH
  • Option to transfer the behavior factor from a dynamic analysis
  • Check of the limit value for the behavior factor
  • Capacity design checks of "Strong column - weak beam"
  • Detailing and particular rules for curvature ductility factor
  • Detailing and particular rules for local ductility
Feature 002654 | Design of Fiber-Reinforced Concrete

The Concrete Design add-on allows you to design fiber-reinforced concrete components according to the guideline "DAfStb Steel Fiber-Reinforced Concrete".

You can use this option for the design according to EN 1992‑1‑1. The design according to the DAfStb guideline is carried out once the concrete of the "Fiber Concrete" type has been assigned to the reinforced structural component.

Go to Explanatory Video
Feature 002652 | "Crosstie" Reinforcement Option for Design According to EN 1992-1-1

In the "Shear Reinforcement" tab, you can select the option "Cross-ties over free rebars with active selection in graphic". It allows you to arrange additional cross-ties on free rebars of the longitudinal reinforcement.

You can activate or deactivate the position of the cross-ties in the Info Graphic. The cross-ties are applied for the ultimate limit state design and the structural design checks. They are available for the design according to EN 1992‑1‑1.

Go to Explanatory Video
Frequently Asked Questions (FAQ)
Which products do you recommend for the structural analysis and design of reinforced concrete structures?
In the table of the objects to be designed in the Concrete Design add-on, punching nodes are listed in the not valid/deactivated column, although I have defined them as punching nodes. How can I fix this?
How can I generate an area load on members via cells in RFEM 6 or RSTAB 9?
How can I use graphic templates for multi printing of a reinforcement?
How can I activate the design with steel fiber-reinforced concrete in the "Concrete Design" add-on for RFEM 6?
How can I set user-defined points for result values on surfaces in RFEM 6?
Customer Projects
Reinforced Concrete Elevator Shaft at Montluçon Station, France (© E.T.L Structures)
Reinforced Concrete Elevator Shaft at Montluçon Station, France
Deformations of Airedale Swing Bridge in RFEM
Airedale Swing Bridge in Rodley, United Kingdom
Exterior View of Pastry Production and Storage Unit | © GH HERVOUET
Creation of a production and storage facility for pastries in Montbert, France
Pedestrian and Cyclist Bridge "Herzogsteg" in Eichstätt, Germany | © Bruno Klomfar
Pedestrian and Cyclist Bridge "Herzogsteg" in Eichstätt, Germany
Front View of Office Building with V-Shaped Steel Composite Columns | © Die Tragwerker GmbH
Office Building with Integrated Visitor Center and Parking Garage in Geiselbulach, Germany
Office Building of Stadtwerke Kirchheim unter Teck, Germany (Rendering) | © MEDIA 4D GmbH
Office Building of Stadtwerke Kirchheim unter Teck, Germany
Quai M, the New Concert Hall in La Roche-sur-Yon, France (© LCA Construction Bois)
New Concert Hall in La Roche-sur-Yon, France
Residential Buildings in Trieste, Italy
Residential Buildings in Trieste, Italy
Deformations in RFEM | © Baumruck + Oswald
AQUAtherm Indoor/Outdoor Swimming Pool in Straubing, Germany
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