Seating (39)

Tekla Structures
2021
Tekla Structures

Seating (39)

Seating (39) connects a column head to one or two beams using an end plate. The end plate is welded to the column head and bolted to the lower flange of the secondary part.

Objects created

  • End plate
  • Stiffeners
  • Bolts
  • Washer plates (optional)

Use for

Situation Description

Seating connection with end plate and stiffeners.

Selection order

  1. Select the main part (column).
  2. Select the first secondary part (beam).
  3. Select the second secondary part (beam).
  4. Click the middle mouse button to create the connection.

Picture tab

Use the Picture tab to control the end plate and stiffener size and position.

Description

1

Distance between the first and the second secondary part.

2

Distance between the end plate the secondary parts.

3

End plate distance from the main part edge.

Positive values move end plate edges closer to the column axis and thus decrease the plate size. Negative values increase the plate size.

The default value is 10 mm.

4

A gap between stiffener plates and secondary beam flange. The default value is 0 mm.

5

Position of the stiffeners.

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

Beam end cut

Define how the secondary beam end is cut. The beam is viewed from the side.

Option

Description

Default

Square

AutoDefaults can change this option.

Square

Cuts the end of the secondary beam square.

Bevel

Cuts the end of the secondary beam parallel to the edge of the main part.

Parts tab

Use the Parts tab to control the end plate, stiffener and washer plate properties.

Define the end plate, stiffener and washer plate thickness, width and height.

Option Description
End plate

By default, width is defined by the bolt group horizontal edge distances, and height is defined by the plate edge distances from the left and right edge of the column.

The default value for end plate thickness is 0.5*the screw diameter.

Stiffeners

By default, height is equal to the distance between secondary beam flanges.

If width is not given, stiffener width is defined based on the flange width. 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.

Washer plates

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

If no thickness is defined, 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 control the chamfer dimensions, and type and the end plate and stiffener orientation.

Description

1

Chamfer type and dimensions.

If you select the No chamfer option, a clash can occur between the stiffener and the I-profile rounding.

Additionally, you can define the chamfer dimensions vertically and horizontally. If you select an arc chamfer, the horizontal dimension is the radius, and the vertical dimension has no effect.

2

Select whether stiffeners are perpendicular or parallel to the secondary beam flange.

3

Gap size to end plate.

Define the limit value for the gap between the end plate and the secondary or main part. Use this gap 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 beam end is left straight.

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

4

Select the end plate orientation.

Bolts tab

Use the Bolts tab to control the bolt properties.

Bolt group dimensions

1

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.

2

Dimension for vertical bolt group position.

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 control the galvanizing holes in the end plate.

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

The center of a hole group is the middle point of the beam and the middle point of the haunch, if the haunch exists. The hole groups are composed of 0, 1, 2 or 4 holes.

Option Description

Default

No holes

AutoDefaults can change this option.

No holes

1 hole

2 holes

4 holes

Hole positions

Table 1.
Description

1

Horizontal distance between the secondary beam center and the upper hole.

2

Horizontal distance between the secondary beam center and the lower hole.

3

Vertical distance between the secondary beam center and the upper hole.

4

Vertical distance between the secondary beam 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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