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Frequently Asked Questions (FAQ)
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A collapse or shear reinforcement according to DIN EN 1992-1-1, 9.4.1 (3) is not output separately in RF-PUNCH Pro and must be additionally taken into account by the designer.
AnswerThe minimum shear reinforcement A sw, min is determined in RF-PUNCH Pro by means of Equation 9.11DE from DIN EN 1992-1-1, 9.4.3.The input values used for determining A sw, min are shown in result table "2.2 Required Punching Shear Reinforcement" in the section "Minimum NB" so that the calculated value can be retraced.Please note that the calculated value A sw, min according to the standard refers to the "cross-section of a stirrup arm (or equivalent)". In RF-PUNCH Pro, this value is then multiplied by the tangential number of the individual stirrup rows, which means that the absolute value of the minimum reinforcement [cm²] in the individual perimeters can increase outwards with increasing round perimeter length or increasing number of stirrup legs.
In the module, there are the options for reinforcement, which has to be taken into account for the shear resistance analysis. The shear force resistance VRd,c is affected by the applied longitudinal reinforcement. By using the options, you can specify which longitudinal reinforcement should be used to perform the check of shear resistance. The check of shear resistance can be performed by applying the following reinforcement:
- Calculated required reinforcement
- Maximum value from required or provided reinforcement
- Automatic increment of the longitudinal reinforcement so that the shear reinforcement is avoided
For example, if you select the second option and avoid the shear reinforcement with the basic reinforcement, then the basic reinforcement is selected and resulted as the required reinforcement.
Please check the design internal forces of the affected elements.
If the cross-section of an element is completely cracked, it is not possible to carry out a shear resistance analysis on this element in the RF‑CONCRETE Surface add‑on module. Result windows of the module will also display a message No. 13 saying that the cross-section is completely cracked at these locations and the shear capacity is not designable.
Further information about the determination of shear capacity can be found in the manual of RF‑CONCRETE Surfaces in Section 22.214.171.124 Shear force resistance without shear reinforcement, which you can download from our homepage.
Check if the design software Punching Shear Reinforcement HDB from HALFEN has been successfully installed and also registered. The best way to test it is to start the design software HDB without using RF-PUNCH Pro, either from the Windows start menu or from the desktop shortcut.
If starting the program has been successful, you can use the interface of RF-PUNCH Pro to HDB for further processing.
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