8 Punching check
Punching check is another check which must be fulfilled for 2D members (Concrete Advanced > Punching). As first the punching data are required to be defined in the node where columns are defined.
Punching check
8.1 Punching data
The punching data are required to be able to perform the punching check. The four types of punching data are used in this example for different types of column support.
Punching data – general shape
The settings of punching data for each type of column are the displayed in the table:
Column head definition in punching data
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Corner |
Internal |
Parallel x |
Parallel y |
|---|---|---|---|
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With respect to the column head the values related to the column head should be defined also for punching check in punching data. The thickness of the slab has to be adapted manually in punching data because we defined real column heads in the slab (see figure "Column head definition in punching data").
8.2 Punching check
The punching check is performed for selected nodes. The difference between punching check for nonprestressed and prestressed concrete is only in calculation of σcp where the effect of the prestressing normal force should be taken into account. It is recommended to verify the settings in the concrete setup for punching, especially whether the effect of the prestressing (normal force) is taken into account or not. For concrete setup see Concrete > ULS > Punching.
Concrete setup for punching
Punching check for node N88
The detailed output for the node N88 is displayed in the following table.
When punching check is satisfied (the maximal shear capacity of concrete strut is not exceeded) then the required area of additional shear reinforcement for punching can be designed (value Asw/u). This reinforcement can be converted to the user reinforcement.
Action button Convert to user reinforcement
You can see the model without column heads where additional shear reinforcement for punching is necessary. The real shear reinforcement for punching used in this example can be like the one for node N86.
Converted shear reinforcement for punching to user reinforcement
