Bridging (80)

Bridging (80) creates bridging elements for cold rolled profiles. You can use any work plane when creating Bridging (80).

Objects created

Bridging
Start clip
End clip

Use for


Situation	Description
	Bridging is created.

Selection order

Select the first rafter.
Select the second rafter.
Select the first purlin.
Select the remaining purlins in one direction only.
Click the middle mouse button to create the bridging.

Part identification key

Picture tab

The Picture tab shows an example of the bridging.

Bridging

Parts tab

Use the Parts tab to define the part properties for the bridging, start clip, and end clip.

Properties


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.
Finish	Describes how the part surface has been treated.

Parameters tab

Use the Parameters tab to define the type and location of the bridging elements.

The component always starts and ends a bridging run with a bolted connection.


Option	Description
Bridging type	Select the briding type.
State of use	Set this value even if you have selected to use the Automatic bridging type option.
Start bridge code Intermediate bridge code End brigde code	Enter the bridging codes for manual bridging types.
Number of rows	Define the number and location of the rows of bridging elements. The options for 1, 2, or 3 row bridging use the bridging elements according to the options that you select in Purlin type and Purlin location. When you select Custom, enter percentage values in Custom spacing.
Custom spacing	Enter percentage values for custom spacing between the rafters, for example: `0.25 0.5 0.75`. If custom spacing is not defined, the longest purlin is used as the base length for spacing.
Purlin type	If you did not select the Custom option in Number of rows, select an option from the list to define the purlin type.
Purlin location	If you did not select the Custom option in Number of rows, select an option from the list to define the purlin location.
Bridging spacing	Select whether spacing is done based on the longest purlin or the selected rafters.

Bolts tab

Use the Bolts tab to define the bolt group dimensions and bolt properties for start and end bolts.

Bolt properties


Option	Description
Read from	Select whether to use bolt properties from a data file or from the dialog. By default, the data file is used.
Use different bolt settings	Select to use different bolt properties for the start and end bolts.

Bolt group dimensions


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

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`

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 holes. No hole does not create holes. Tapped creates 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.

Data files used by Bridging (S80)

For the Australasia environment, ensure that the following data files are located in the ...\Environments\Australasia\General\profil\cr\ folder:

overlap.dat
brioc.dat
brnam.dat

overlap.dat file

This file contains information about the purlin profiles. Each row contains information about a specific purlin and the columns define the properties described in the table below.


Column	Description
1	The exact name of the profile used for the purlin in the model
3	Bolt standard. Defined in the bolt assembly catalog.
4	Bolt size. Defined in the bolt assembly catalog.
	Gap between the bolt and the hole
6	Dimension of the slotted hole in the X direction. For no slotted holes, set to zero.
7	Dimension of the slotted hole in the Y direction. For no slotted holes, set to zero.
9	Indicates if the thread can be inside bolted parts when using bolts with a shaft. This has no effect if full-threaded bolts are used. 0 – No 1 – Yes
12	Vertical distance between bolts

brloc.dat file

This file contains information about the location of bridging profiles. Each row contains information about a specific bridging type and the columns define the properties described in the table below.


Column	Description
1	Bridging type
2	Purlin type: Simple, Continuous, or Lapped.
3	The type of span where the bridging elements are located: `INT` – inner span `END` – end span
4	Span ratio for 1 row of bridging
5	Span ratio for the first row of bridging if there are two rows of bridging
6	Span ratio for the second row of bridging if there are two rows of bridging
7	Span ratio for the first row of bridging if there are three rows of bridging
8	Span ratio for the second row of bridging if there are three rows of bridging
9	Span ratio for the third row of bridging if there are three rows of bridging

Span ratio values are cumulative and must be numbers between 0 and 1.

brnam.dat file

This file contains the names of bridging elements and cleats, comments and information about clip bolts. Each row defines a specific bridging type and the columns define the properties described in the table below.

When selecting the Bridging type on the Parameters tab, use the Automatic option to have Tekla Structures calculate the bridging type using the brnam.dat file. This is the default option. The option searches for the first line that contains the correct profile name. If this line is in the BHP block, the component uses the purlin height to determine the bridging type. If the line is not in the BHP block, the component selects the bridging type that appears in the first column.


Column	Description
1	Bridging type
2	Name of the purlin profile in the model
3	Name of the bridging profile in the model
4	Name of the clip profile in the model
7	Comment for the first clip. To not create a start clip, set to None.
8	Comment for the first bridging element if `End1` is set to Bolted
9	Comment for the start bridging element if `End1` is set to Auto
10	Comment for the interior bridging elements
11	Comment for the end bridging element if `End2` is set to Bolted
12	Comment for the end bridging element if `End2` is set to Auto
13	Comment for the fascia bridging element
14	Comment for the end clip. To not create an end clip, set to None.
15	Bolt hole properties for the start clip, XY. Enter a two-digit number to set the bolt hole settings for start clips. X 0: No bolt or hole at top 1: Hole at top 2: Bolt at top Y 0: No bolt or hole at bottom 1: Hole at bottom 2: Bolt at bottom
16	Bolt hole properties for interior clips, XY. Enter a two-digit number to set the bolt hole settings for interior clips. X 0: No bolt or hole at top 1: Hole at top 2: Bolt at top Y 0: No bolt or hole at bottom 1: Hole at bottom 2: Bolt at bottom
17	Bolt hole properties for the end clip, XY. Enter a two-digit number to set the bolt hole settings for end clips. X 0: No bolt or hole at top 1: Hole at top 2: Bolt at top Y 0: No bolt or hole at bottom 1: Hole at bottom 2: Bolt at bottom