Design and check punching shear

Overview of the Design Punching Shear command

The Design Punching Shear command calculates an applied load on the slab, accounting for the difference in column/wall axial load and bending. In addition, the command checks the slab shear stresses, accounting for the reinforcement present (background and column/general patches).

Provided that you are using the Eurocode or ACI head code, you can also design the punching reinforcement as an orthogonal or circular arrangement of stud rails at the following locations:

In flat slabs:

Concrete columns supporting a flat slab without drops
Concrete columns supported by a flat slab
Concrete columns through a flat slab without drops
Point loads at either face of a flat slab

In foundation mats:

Concrete columns supported by a foundation mat
Point loads on a foundation mat

Column head drops and the presence of openings within a certain distance of the punching shear boundary are taken into account in the punching shear calculations.

Where punching checks are closely spaced and the perimeters overlap the checks are beyond scope.

Note:

Since the checks are dependent on using the correct levels of slab reinforcement (typically provided by patch reinforcement), do not check punching before designing the patches.
View punching checks applied to walls with caution. Their applicability to long walls is particularly questionable, as the check does not consider the potential for stress concentrations at the ends of the wall.

Check punching shear for an individual punching check item

Do one of the following:

To	Do this
Check an individual punching check item from a 2D or 3D view	Hover the mouse pointer over the punching check. If a different entity is highlighted, press the <down arrow> cursor key until the correct reference is shown in the Select Entity tooltip. Right-click, and from the context menu that appears, select Check Punching Shear.
Check an individual punching check item from the Structure Tree	In the Project Workspace, click Structure tab. In the Slabs> Punching Checks branch, locate the check reference. Right click and select Check Punching Shear.

Check all punching check items

In the Project Workspace, click Structure tab
Right click the Structure branch and select Check Punching Shear

Check all punching shear check items on a floor

In the Project Workspace, click Structure tab.
In the Levels branch, right click the required Level and select Check Punching Shear.

Design all punching check items

Do one of the following:

To	Do this
Design all punching check items from the ribbon	On the Design tab, click Design Punching Shear.
Design all punching check items from the Structure Tree	In the Project Workspace, click Structure tab. Right click the Structure branch and select Design Punching Shear.

Tekla Structural Designer performs punching shear checks for all punching check items in the model based on their individual auto-design setting. If the punching check item does not connect to a flat slab, punching shear is flagged as beyond scope.

Design all punching shear check items on a floor

In the Project Workspace, click Structure tab.
In the Levels branch, right click the required Level and select Design Punching Shear.

Design an individual punching check item

Do one of the following:

To	Do this
Design an individual punching check item from a 2D or 3D view	Hover the mouse pointer over the punching check. If a different entity is highlighted, press the <down arrow> cursor key until the correct reference is shown in the Select Entity tooltip. Right-click, and from the context menu that appears, select Design Punching Shear.
Design an individual punching check item from the Structure Tree	In the Project Workspace, click Structure tab. In the Slabs> Punching Checks branch, locate the check reference. Right click and select Design Punching Shear.

Tekla Structural Designer displays the results of the design in a new dialog box.

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