Detailed punching shear check

Function Punching > Punching check in service Concrete Advanced offers the action button named [Single check]. This button opens a dialogue for detailed punching shear check.

The dialogue is divided into several tabs:

In addition, the results can be previewed in the Preview window or exported to the Document.

Geometry of punching

The data on this tab are mainly used to determine the critical perimeter.

Column type group

Column data

The dimensions of the column can be defined in these fields. In the case of a support, these dimensions are also stored.

The axes in the picture are the local axes of the column.

Hole data

Check the ’Hole’ box, if you want to define a hole.

In this group, the dimensions of the hole have to be defined.

Column position group

The following column positions are available:

The axes in the picture are the axes of the plate

Parallel to the x-side

Column distance y

Distance in the y-direction between the edge of the slab and the nearest face of the column.

Parallel to the y-side

Analogous to parallel to the x-side

Corner column

Column distance x

Distance in the x-direction between the edge of the slab and the nearest face of the column.

Column distance y

Distance in the y-direction between the edge of the slab and the nearest face of the column.

Angle of edge with x-axis

 

Angle of the edge of the slab with the x-axis.

Angle of edge with y-axis

Angle of the edge of the slab with the y-axis.

Central column

No position definition is needed

Hole position

If you check "Hole" in the Column type group, the following positions have to be defined.

Hole distance x

Distance in the x-direction between the hole and the centre of the column.

Hole distance y

Distance in the y-direction between the hole and the centre of the column.

Section groups

Plate data

Thickness of plate

Thickness of the plate at the critical perimeter.

Default value: the thickness of the plate.

Concrete

If possible, the material may be changed here.

Column head data

Column head

 

Check this box to define a column head.

Type of depth

Select the type of the column head. Prismatic and

Pyramidal are for rectangular columns, cylindrical and conical are for circular columns.

Depth of the head

Width of the head

Lx of the head

Lyof the head

Depending on the column head type the depth and width of the column head can be defined using the appropriate fields.

Loads

This tab shows either (i) the load imported from the model of the analysed structure, or (ii) the manually defined load in the assessed point. This is controlled by the item User loads in the Punching shear data.

If the load from the model is used, this tab shows all available load cases or combinations defined in the project.

If user load is used, the table contains the user-defined loads. Two buttons below the table makes it possible to add a new combination or to delete the existing one.

qd

Distributed load (2D) on the slab of the appropriate load case/combination.

It is used to correct Vd › punching force VSdpunch.

VSd

Concentrated load causing the punching force.

For a support this is the reaction force.

For a column it is its normal force that works on the slab.

mSdx

Minimum bending moment per unit length in the x-direction in the slab corresponding to the appropriate load case/combination.

mSdy

Minimum bending moment per unit length in the y-direction in the slab corresponding to the appropriate load case/combination.

The sign convention can be read from the attached picture.

Main reinforcement

Note: This tab is not available for CSN/STN.

This tab shows the amount of longitudinal reinforcement in the plate near the node that is investigated.

Profile, Angle and Distance groups

The values are determined in the following way:

Maximum value of reinforcement amount is used.

Area group

This group contains the calculated values of necessary reinforcement per unit of length in the appropriate layer.

Design of reinforcement

The contents of this tab may be different for different standards.

Loads group

The required load case / combination can be selected in the list of defined load cases / combinations. Results of punching shear check are displayed on the screen.

Critical section group

Detailed explanation of individual parameters is given in appropriate standards and in the theoretical manual.

The button [Calculation] performs the re-calculation for the current load case / combination.

Reinforcement for punching

Note: This tab is available only for CSN/STN.

This dialogue enables you to define shear reinforcement for punching shear. It is possible to input bent-up bars and links (stirrups). Bent-up bars are defined by their number, links by the number of rows.

Reinforcement group

Steel

 

Definition of the type of reinforcement steel.

Number of rows

Defines the total number of rows of shear reinforcement.

For links it is the number of rows of links bordering the critical sections.

For bent-up bars it is the number of their various types. These may differ in profile and steel and also position and number.

Type of reinforcement

The required type of reinforcement can be selected here.

Angle of bent-up bars

(accessible for bent-up only, links are assumed perpendicular to the middle plane)

The angle between the bent-up and the plate surface.

End of stirrups

(accessible for links only)

The standard distinguishes between welded links and links with anchor hooks.

Load group

The required load case / combination may be selected here. The selected load case / combination is used for the design of punching shear reinforcement.

Reinforcement row group

One tab opens for each row of reinforcement.

Bars diameter

 

Defines the diameter of the reinforcement bars.

Distance between bars

Distance between bars.

Note: The distance of bars is measured from centre-to-centre of the bar.

Concrete cover top

Concrete cover at the top surface. It influences whether the row is considered in the calculation.

Concrete cover bottom

 

Analogous to the item above.

As required

The reinforcement area that is necessary to transfer the relative shear force.

Reinforcement areas

The reinforcement area calculated from the input parameters.

Position of reinforcement from column face

Defines the distance of the reinforcement bars from the column surface.

For bent-up bars it is the distance of bent-up foot from the column face.

For links it is the distance between the link axis and the column face.

Set optimal position

Opens a dialogue that calculates an optimal position of the reinforcement.

The position is calculated in accordance with the provision defined in art. 5.5.6.14 of the standard.

Check

Note: This tab is available only for CSN/STN.

This tab can be used to assess punching shear including the reinforcement.

Load group

The required load case / combination may be selected here. The selected load case / combination is used for the design of punching shear reinforcement.

Total design tab

This tab contains the overall evaluation. The worst critical section is automatically found and checked. Maximal punching shear force qd max and the ultimate punching shear force qu are listed including the critical section where these values were found.

Critical section tabs

Detailed results can be scrutinised in the tabs for individual sections.

hs

 

Plate thickness.

Mcdx, Mcdy

 

Moments recalculated to the centroid of the critical section.

ucrx, urcy

 

Length of the critical section.

ucr

 

Total length of the critical section.

qqd

 

Shear forces effects.

qxmd, qymd

 

Moment effects.

qbu

 

Shear force transferred by concrete.

qsu

 

Shear force transferred by the reinforcement.

[List qsu]

 

Lists the effectiveness of reinforcement for individual sections in accordance with the standard. The list specifies the distance where the reinforcement can be placed in order to be effective.

Document setup

This tab defines the contents of the document tables.