Seating cap (37)

Tekla Structures
2021
Tekla Structures

Seating cap (37)

Seating cap (37) connects a beam to a column head with an end plate welded to the column head and bolted to the lower flange of the secondary beam. The connection also creates stiffeners to the secondary part web, and optionally rectangular washer plates.

Objects created

  • End plates

  • Stiffeners

  • Washer plates

  • Bolts

  • Welds

Use for

Option Description

Square beam connected to a column with a bolted end plate.

Sloped beam connected to a column with a bolted end plate.

Selection order

  1. Select the main part (column).

  2. Select the secondary part (beam).

    The connection is created automatically when the secondary part is selected.

Part identification key

1

End plate

2

Stiffener

Picture tab

Use the Picture tab to define the geometry of the connection.

End plate positions

Description Default

1

End plate edge distance to the main part flange.

2

End plate edge distance from the secondary part flange.

You can control the column end plate size in the secondary part axis direction. Positive values move the end plate edge towards the centre.

-10 mm

3

End plate edge distance to the main part flange.

4

Distance between the end plate and the secondary part.

Stiffener positions

Description Default

1

Distance between the stiffener plate and the secondary beam flange.

0

Parts tab

Use the Parts tab to define the part properties.

Plates

Option Description Default

Prim end plate

Thickness of the main part end plate.

Half of the screw diameter

The width is defined by the bolt group horizontal edge distances.

The height is defined by the plate edge distances from the left and right edge of the column.

Sec stiffeners

Thickness, width and height of the stiffeners.

The default value for the stiffener thickness is 1.5*secondary beam web thickness rounded upwards to: 8, 10, 12, 16, 20, 25, 30, 35, 40, 45, and so on.

If you do not define the width, stiffener width is based on the flange width.

The height is equal to the distance between the secondary beam flanges.

Sec end plate

Thickness of the secondary part end plate.

The size of the plate is based on the dimensions of the secondary part. You can control the dimensions on the Picture tab.

1.5* secondary beam web thickness rounded upwards to: 8, 10, 12, 16, 20, 25, 30, 35, 40, 45, and so on.

Washer plates

Thickness, width and height of the washer plates.

Washer plates are small rectangular plates used as washers between the bolt head and secondary beam flange.

If you do not enter a value for the thickness, the plates are not created.

Option

Description

Default

Pos_No

Prefix and start number for the part position number.

Some components have a second row of fields where you can enter the assembly position number.

The default part start number is defined in the Components settings in File menu > Settings > Options.

Material

Material grade.

The default material is defined in the Part material box in the Components settings in File menu > Settings > Options.

Name

Name that is shown in drawings and reports.

Parameters tab

Use the Parameters tab to define the chamfer dimensions and stiffener position.

Stiffener position

Description

1

Define the stiffener offset from the secondary part web.

2

Define the stiffener offset from the main part flange.

By default, stiffeners are placed to the same plane as the column flange. Positive offset values move stiffeners to the right and negative to the left.

Stiffener angle

Option Description

Default

Stiffeners are created parallel to the column flange.

AutoDefaults can change this option.

Stiffeners are created parallel to the column flange.

Stiffeners are created perpendicular to the secondary beam flange.

Gap size

Define the limit value for the gap between the end plate and the secondary beam. Use this when the beam is slightly curved or sloped to decide if the end angle is so small that the beam end can be straight.

If the actual gap is smaller than this value, the end of the beam is left straight.

If the actual gap is larger than this value, the end of the beam is fitted to the end plate.

Option Description

Horizontal gap dimension

Vertical gap dimension

Chamfer size

Description

1

Horizontal chamfer dimension

2

Vertical chamfer dimension

Chamfer type

Option

Description

Default.

Line chamfer

AutoDefaults can change this option.

No chamfer

Line chamfer

Convex arc chamfer

Concave arc chamfer

Bolts tab

Use the Bolts tab to define the bolt group dimensions and bolt properties.

Bolt group dimensions

Description

1

Dimension for vertical bolt group position.

2

Select how to measure the dimensions for vertical bolt group position.

  • Top: From the upper edge of the secondary part to the uppermost bolt.

  • Middle: From the center line of the bolts to the center line of the secondary part.

  • Below: From the lower edge of the secondary part to the lowest bolt.

3

Bolt edge distance.

Edge distance is the distance from the center of a bolt to the edge of the part.

4

Number of bolts.

5

Bolt spacing.

Use a space to separate bolt spacing values. Enter a value for each space between bolts. For example, if there are 3 bolts, enter 2 values.

6

Dimension for horizontal bolt group position.

7

Select how to measure the dimensions for horizontal bolt group position.

  • Left: From the left edge of the secondary part to the leftmost bolt.

  • Middle: From the center line of the secondary part to the center line of the bolts.

  • Right: From the right edge of the secondary part to the rightmost bolt.

Bolt basic properties

Option

Description

Default

Bolt size

Bolt diameter.

Available sizes are defined in the bolt assembly catalog.

Bolt standard

Bolt standard to be used inside the component.

Available standards are defined in the bolt assembly catalog.

Tolerance

Gap between the bolt and the hole.

Thread in mat

Defines whether the thread may be within the bolted parts when bolts are used with a shaft.

This has no effect when full-threaded bolts are used.

Yes

Site/Workshop

Location where the bolts should be attached.

Site

Slotted holes

You can define slotted, oversized, or tapped holes.

Option

Description

Default

1

Vertical dimension of slotted hole.

0, which results in a round hole.

2

Horizontal dimension of slotted hole, or allowance for oversized holes.

0, which results in a round hole.

Hole type

Slotted creates slotted holes.

Oversized creates oversized or tapped holes.

No hole does not create holes.

Rotate Slots

When the hole type is Slotted, this option rotates the slotted holes.

Slots in

Part(s) in which slotted holes are created. The options depend on the component in question.

Bolt assembly

The selected check boxes define which component objects (bolt, washers, and nuts) are used in the bolt assembly.

If you want to create a hole only, clear all the check boxes.

To modify the bolt assembly in an existing component, select the Effect in modify check box and click Modify.

Bolt length increase

Define how much the bolt length is increased. Use this option when, for example, painting requires the bolt length to be increased.

Staggering of bolts

Option

Description

Default

Not staggered

AutoDefaults can change this option.

Not staggered

Staggered type 1

Staggered type 2

Staggered type 3

Staggered type 4

Holes tab

Use the Holes tab to define the holes created in the end plates.

Option Description

Bolt standard

Select the bolt standard.

Bolt type

Select the bolt type to define the location where the bolts should be attached.

Read data from

You can select to use the sinkholes.dat definition file to specify the default values for horizontal and vertical offsets, and the diameters for upper and lower holes.

The file is searched in the following order: Environment common system steel folder (..\Environments\common\system\Steel), model folder, XS_FIRM, XS_PROJECT and XS_SYSTEM folder.

You can also select to define the holes in the component dialog box.

Number of holes

Option Description

Default

No holes

AutoDefaults can change this option.

No holes

1 hole

2 holes

4 holes

Hole positions

Description

1

Horizontal distance between the end plate center and the upper hole.

2

Horizontal distance between the end plate center and the lower hole.

3

Vertical distance between the end plate center and the upper hole.

4

Vertical distance between the end plate center and the lower hole.

5

Diameter of the lower hole.

6

Diameter of the upper hole.

General tab

Click the link below to find out more:

General tab

Design tab

Click the link below to find out more:

Design tab

Analysis tab

Click the link below to find out more:

Analysis tab

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