Create punching checks in a flat slab

To create punching checks in a flat slab, do the following:

On the ribbon, go to the Design tab.
Select Punching Check.
In the Properties window, adjust the check properties according to your needs.

Note: The tension reinforcement defaults to the slab Top surface when the check is created from the Design tab. (If created from the Foundations tab the only difference is that it defaults to the Bottom surface.)
To create checks in either a 2D or 3D scene view, do one of the following:
- Hover the mouse pointer over the desired column node, wall node, or point load. When the Pick Punching Check Location tooltip appears, click to add the punching check at the selected node.
- Hold down the left mouse button and drag a box to add punching checks to all potential check locations within the box.

Create punching checks in a foundation mat

To create punching checks in a foundation mat, do the following:

On the ribbon, go to the Foundations tab.
Select Punching Check.
In the Properties window, adjust the check properties according to your needs.

Note: The tension reinforcement defaults to the mat Bottom surface when the check is created from the Foundations tab. (If created from the Design tab the only difference is that it defaults to the Top surface.)
To create checks in either a 2D or 3D scene view, do one of the following:
- Hover the mouse pointer over the desired column node, wall node, or point load. When the Pick Punching Check Location tooltip appears, click to add the punching check at the selected node.
- Hold down the left mouse button and drag a box to add punching checks to all potential check locations within the box.

Specify the axis orientation for punching checks applied to point loads

When you apply a punching check to a point load, by default the check Y and Z axes are automatically orientated to align with global X and Y.

If this is not appropriate you can manually define the punching check Z axis orientation as follows:

In the Properties window, select User loaded area.
Specify the Loaded Area Orientation angle in relation to the global Y axis.

Note:

The above doesn't apply for checks to columns because in that case the check Y and Z axes are automatically orientated to align with the column major and minor axes. The two axis systems are locked together, so if the column is rotated, the punching check axes also rotate. For more information, see: Punching shear check axis system

Override the punching check loaded area

When you apply a punching check to a point load, the default loaded area is taken as 4in x 4in (US Customary units), or 100mm x 100mm (metric units).

When you apply a punching check to a column, the loaded area is based on the column section - the default being the section boundary box.

There can be certain situations where the above defaults may not be appropriate, (for example when the check is applied to the bottom of a column attached to a base plate or pedestal).

In such situations, you can override the default and specify a User loaded area as follows:

In the Properties window, select User loaded area.
Specify the Loaded Area Breadth and Loaded Area Depth.

Confirm punching check positions

When you apply a punching check, the program automatically detects whether a slab is present in each of punching check axis directions. In the Properties window, Slab in y positive/negative and Slab in z positive/negative are set accordingly. Based on these, the punching check is assumed to be at an Internal, Edge Y, Edge Z or Corner position.

It is very easy to graphically review and modify the check position from a Review View as shown in the image below.

Alternatively, you could manually adjust the position from the Properties window as follows:

Select Slab Override
Change Slab in y positive/negative and Slab in z positive/negative as required.

Specify stud rail reinforcement

Restriction:

Stud rail reinforcement is only available for Eurocode and ACI head codes.

To specify the reinforcement:

Create a punching check item as instructed above.
Right-click the punching check item.
In the context menu, select Edit Reinforcement.
The Punching shear reinforcement properties dialog box is displayed.
Select the Use reinforcement option.
Select whether you want to autodesign the reinforcement, and, if auto-designing, select the required reinforcement starting from parameter.
Select the reinforcement parameters according to your needs.
Adjust the stud rail parameters according to your needs.

Note: For more information about rail layout arrangements, see: Reinforcement layout.
Provided the analysis has been performed, you can run the punching shear calculations for the specified layout by selecting Check... on the right hand side of the dialog box.
When the layout is acceptable, click OK
The reinforcement data is saved to the punching check item Properties window.