Polybeam pan (S73)

Tekla Structures
2021
Tekla Structures

Polybeam pan (S73)

Polybeam pan (S73) creates straight stairs with optional top and bottom landings. The stairs consist of stringers, possible landings, and the actual steps created with plates.

Objects created

  • Stringers

  • Steps

  • Landings (optional)

  • Cuts to notch the stringer (optional)

  • Plates (optional)

  • Bolts

  • Welds

Use for

Situation

Description

Polybeam pan stairs.

Top of the stringer is created as horizontal landing.

Bottom of the stringer is notched to bear on the supporting beam.

The same option is also available for the top of the stringer.

Before you start

If the stringers are notched to bear on the supporting beams, create the supporting beams before creating the stairs.

Selection order

  1. Pick a point to indicate the nosing point of the first step.

  2. Pick another point to indicate the nosing point of the last step.

    Note that the order in which the points are picked has no effect.

  3. Click the middle mouse button to create the stairs.

    If you have selected the following notched options on the Picture tab, select the supporting beams and then click the middle mouse button.

Part identification key

Part

1

Stringer

2

Step

3

Landings

Picture tab

Use the Picture tab to control the stringer geometry and the nosing points of the steps.

Top landing type

Option Description

Default

Horizontal landing

Notched

The stringer top is on the supporting part. Vertical and horizontal plates are welded at the end of the stringer.

Bottom landing type

Option Description

Default

Vertical

Creates a vertical landing where the lower picked point is on the top plane of the last step.

Horizontal

Creates a horizontal landing where the lower picked point is on the top plane of the last step.

Vertical lowered point

The picked point is at the top of steel or finish floor.

Horizontal lowered point

The picked point is at top of steel or finish floor.

Notched

Created a notch to the bottom of the stringer to bear on the supporting part. A vertical plate is welded at the end of the stringer.

Stair dimensions

Description Default

1

Define the distance between the upper point and the end of the left top landing.

If you set the value to 0 mm, the left top landing is not created.

If you set the top landing type to notched, define the cut dimension of the horizontal plate from the stringer edge.

0 mm

2

Define the vertical distance from the upper point to the top of steel of the top landing.

If the top landing is not created, the stringer top of steel is used.

If you set the top landing type to notched, define the vertical distance from the upper point to the stringer top horizontal cut.

200 mm

3

Define the maximum distance allowed between two consecutive steps.

The spacing between the steps is calculated using the step spacing type Exact or Equal, and the number of steps.

For example, if the step height should be 200 mm, the Exact setting creates steps of exactly this height (enter the number of steps as an integer). The Equal setting creates the required number of steps from the bottom to the top, with the height calculated as close to 200 mm as possible.

(Z*220)/(Z+220) mm,

where Z is the vertical distance between the 2 picked points.

4

Select the direction of the nosing dimension of the steps:

  • Vertical
  • Horizontal
  • Perpendicular

Vertical

5

Define the nosing dimension of the steps. This dimension depends on the direction you have selected.

0 mm

6

Define this dimension based on the selected bottom landing type:

  • Horizontal or horizontal lowered point bottom landing

    Define the vertical distance from the lower point to the top of steel of the bottom landing.

  • Vertical or vertical lowered point bottom landing

    Define the horizontal distance from the lower picked point to the most distant face of the bottom landing.

  • Notched bottom landing

    Define the horizontal distance from the lower point to the stringer vertical cut. By default, the cut is made at the supporting part edge.

150 mm

7

Define the vertical dimension from the lower point to the first step.

You can define this dimension when the step spacing type is set to Equal and the bottom landing type is either vertical or horizontal lowered point.

Equal with vertical spacing between steps

8

Define the cut dimension of the vertical plate from the stringer edge.

You can define this dimension when the bottom landing type is set to notched.

0 mm

9

12

Define this dimension based on the selected bottom landing type:

  • Horizontal or horizontal lowered point bottom landing.

    Define the horizontal edge distance between the lower point and the bottom landing.

  • Vertical or vertical lowered point bottom landing.

    Define the vertical edge distance between the lower point and the lowest point of the bottom landing.

600 mm

10

Define the vertical gap between the lower supporting part and the stringer cut.

You can define this dimension when you have set the bottom landing type to notched.

0 mm

11

Define the horizontal gap between the lower supporting part and the stringer cut.

You can define this dimension when you have set the bottom landing type to notched.

0 mm

13

Define the dimension to shorten the steps equally on both sides.

0 mm

14

Define the width of the steps.

1000 mm

15

Define the horizontal gap between the upper supporting part and the stringer cut.

You can define this dimension when you have set the top landing type to notched.

0 mm

16

Define the vertical gap between the upper supporting part and the stringer cut.

You can define this dimension when you have set the top landing type to notched.

0 mm

17

Define this dimension based on the selected top landing type:

  • Horizontal top landing.

    Define the distance between the upper point and the end of the stringer.

  • Notched top landing.

    Define the horizontal distance between the upper point and the stringer vertical cut. By default the cut is made at the supporting part edge.

If you set this dimension to 0 mm, the top landing is not created.

0 mm

18

Select the step spacing type:

  • Exact creates the steps of exactly the defined height. Enter the number of steps as an integer.
  • Equal creates the required number of steps from the bottom to the top, with the height calculated as close as possible to the defined step height.

The spacing type controls how the vertical spacing between the steps is calculated.

If you select Exact and set the bottom landing type to horizontal or vertical lower point, the steps are spaced from the upper point to the lower point. In all other cases the steps are spaced from the lower point to the upper point.

Equal

19

Enter the number of steps.

This option depends on step spacing type and step spacing.

If you set the step spacing type to Exact, or to Equal and the spacing distance is not defined, Polybeam pan (S73) creates the number of steps you have defined.

Calculated from the vertical distance between the picked points and the spacing between the steps

Stair setup tab

Use the Stair setup tab to control the part properties, top and bottom steps, position of the stairs on the horizontal plane, and rotation of stringers and steps.

Stair part properties

Part Description Default

1

Left stringer

Always created

Select a profile from the profile catalog.

BLU400*2

The default name is STRINGER.

1

Right stringer

Always created

Select a profile from the profile catalog.

BLU400*2

The default name is STRINGER.

2

Upper H plate

Created only if the top of the stringer is on the supporting beam.

6 mm

The default name is PLATE.

3

Upper V plate

Created only if the top of the stringer in on the supporting beam.

6 mm

The default name is PLATE.

4

Lower V plate

Created only if the bottom of the stringer in on the supporting beam.

6 mm

The default name is PLATE.

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.

Class

Part class number.

Stair setup settings

Option Description

Create assembly

Define which parts of the stair component form an assembly. The default is stringers.

Stringer reference line

  • Above: The line positioned on the inside of the stairs on the top face is used as the reference line.
  • Nosing: The nosing line of the steps is used as the reference line.

The reference line is used for workshop drawings.

Steps rotation

Rotation of the step around its axis. The default is Top.

Position in plane

Position of the stairs. The middle line of steps is used as the reference line. The default is Right.

Offset

Offset of the stairs on the plane from the position that is set in the Position in plane option.

The default offset is 0 mm.

Stringer rotation

Rotation of the stringer around its axis. The default is top .

Create top step

Define whether the first step of the stairs (the highest step) is created. By default, the first step is created.

Create bottom step

Define whether the last step of the stairs (the lowest step) is created. By default, the last step is created.

Bolts tab

Use the Bolts tab to control the properties of the bolt group that connects the steps to the stringers.

Bolt group dimensions

Note that if you define the vertical dimensions of the step on the Polybeam pan tab, the dimensions defined on the Polybeam pan tab are used.

Description

Default

1

Bolt edge distance.

bolt diameter * 1.5

2

Number of bolts.

2

3

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.

100 mm

Bolting direction

Option

Description

Default.

Bolted from the step to the bracket.

AutoDefaults can change this option.

Bolted from the step to the bracket.

Bolted from the bracket to the step.

Bolt basic properties

Description

Default

Bolt size

Bolt diameter.

20 mm

Bolt standard

The bolt standard to be used inside the component.

7990

Tolerance

The gap between the bolt and the hole.

2 mm

Thread in mat

Defines whether or not the thread may be within the bolted parts when using bolts with a shaft. This has no effect when using full-threaded bolts.

Yes

Site/Workshop

Location where the bolts should be attached.

Site

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.

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.

Slotted holes no

Define the number of slotted holes.

Hole type

Slotted creates slotted holes.

Oversized creates oversized or tapped 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.

Polybeam pan tab

Use the Polybeam pan tab to define the step profile properties and dimensions.

Plate

Part Description Default

Plate profile

To create a plate profile, select a profile from the profile catalog.

PL10*150

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.

Class

Part class number.

Step profile dimensions

Description Default

1

Define the height of the vertical part of the step.

Vertical dimension value defined on the Bolts tab.

2

Define the symmetrical chamfer for the back corner of the all step plates.

0 mm

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