In addition to our technical support (e.g. via chat), you’ll find resources on our website that may help you with your design using Dlubal Software.
Frequently Asked Questions (FAQ)
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In RF‑PUNCH Pro, a primary and secondary load is determined when introducing a compression and tensile force at a point of punching shear (for example, a column). For example, this may be the case when calculating a result combination (RC) that results from a previous dynamic analysis with RF‑/DYNAM Pro.
In this case, the tensile and compressive forces may occur at the connection of a column to a slab. The add-on module analyzes both "punching directions" individually and displays them as "primary load" and "secondary load."
Yes, it is possible to also perform punching shear designs for vertical walls.
Please note, however, that this feature was not available in the first versions of RF‑PUNCH Pro. For this, you will need RFEM 5.08 or later.
Yes, it is possible in Window "1.5 Punching Nodes."
For example, this can be used if the determination of the punching load by using the smoothed or unsmoothed distribution of shear forces in the control perimeter is negatively affected by singularities.
Yes, it is possible. For this, open Window 1.5.
If there are too few nodes selected for design, so that the program cannot determine the dimensions lx or ly automatically according to DIN EN 1992‑1‑1, 6.4.5 (NA6), Figure NA 6.22.1, a message appears, saying that the conditions for determining the minimum bending moments are not fulfilled.
The program requires at least 4 nodes to determine the span lengths in the x- and y‑direction.
In this case, you can define the minimum bending moments manually.
In RF‑PUNCH Pro, you can select for design the nodes where the concentrated load is applied as a "nodal load."
- Free concentrated loads cannot be applied here as the location of the free concentrated loads is not defined by a node, but by their coordinates.
- The nodes subjected to a nodal load can only be picked once a load has been selected for design.
When determining the punching load from shear forces in the critical perimeter, a continuous perimeter is applied.
If an intermittent perimeter was to be used when determining the punching load, the load component (along the intermittent length) might not be considered. This would be the case, for example, if you have only defined the opening in RF‑PUNCH Pro, but not in the RFEM model. In the RFEM model, the shear force would be generated by using the continuous cross-section. If the component were neglected, there would be too small punching load determined.
Therefore, the intermittent control perimeter is always applied in RF‑PUNCH Pro when determining the punching load from the shear forces within the critical perimeter.
During the design (on the resistance side), the opening is considered again and the perimeter section is reduced accordingly.
AnswerYes, it is.You can edit the concrete cover in the first line for the direction d1 and d2, and then switch to the cell in the second line and copy the value from the cell above it using the [F8] key.In this way, you can quickly edit the values for all connected surfaces.You can also use the button to filter the used surfaces in order to reduce the number of the lines displayed. For this, see the link below.
Yes, it is possible. In Window "1.4 Longitudinal Reinforcement" includes a filter function.If you click this button, the surfaces connected to the punching points are only displayed.
AnswerFor the punching shear design on a column, RF‑PUNCH Pro requires a node at which the axial force of the column can be determined for the design.If you have displayed the column as a solid (for example, with a rectangular cross-section) and directly connect this solid to the ceiling, you cannot use this situation for the design in RF‑PUNCH Pro. The member internal force is missing as there is only one solid used.However, you can enter a short coupling member (for example, a rigid member) to the end of the solid. Then, the rigid member can be connected to the ceiling at an end node, and the axial force in the coupling member can be used for the punching shear design.Please note that it is not necessary to define the dimensions of the coupling member or rigid member in the RFEM model. Therefore, RF‑PUNCH Pro applies the standard dimensions for the column cross-section.
RF-PUNCH Pro tries to automatically detect the correct geometry of the node of punching shear from the model input and to specify it correctly.Figure 01 - Wall Corner from Downstand BeamsDepending on the entered data, it may be necessary to adjust the preset geometry. For example, because a column is recognized on a wall corner instead of punching shear design. You can change this in Window 1.5, so that the correct punching geometry can be selected, if necessary.
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Wind Simulation & Wind Load Generation
With the stand-alone program RWIND Simulation, wind flows around simple or complex structures can be simulated by means of a digital wind tunnel.
The generated wind loads acting on these objects can be imported to RFEM or RSTAB.
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