Cold rolled overlap (1)

Cold rolled overlap (1) connects one or two purlins or rails to a rafter or a stanchion. Some properties of this component are loaded directly from the overlap.dat file. Contact your local Tekla Structures support if you need to customize the component more than the dialog box allows.

Objects created

Angle cleat
Stiffener
Stays
Bolts
Welds

Use for

You can use the connection for:

Overlap connections
Butt connections
Connecting double span purlins or rails
Gable ends

Do not use for connections to hip rafters that have a specifically designed connection.


Situation	Description
	Beam to beam full bearing rafter connection to two secondary parts. Plate connection.
	Beam to beam full bearing rafter connection to two secondary parts. Angle connection.
	Beam to beam full bearing rafter connection to two secondary parts. Knee brace connection.

Before you start

Create two purlins at the same depth and with parallel center lines.

Create the purlins using alternate rotations, first top, then bottom, and so on.
Position the purlins to the center line of the rafter. Tekla Structures will automatically extend them to form the required overlap.
Define the gable overhang, if needed.

Use the manufacturer’s standard offset for the rafter flange.

These settings cause purlins to clash, so when performing clash check you can exclude them using a selection filter. For example, enter PURLIN as the property name in the filter.

Selection order

Select the main part (rafter or stanchion).
Select the secondary parts (one or two purlins).
Click the middle mouse button to create the component.

Part identification key


	Description
1	Angle cleat profile
2	Stay profile
3	Stay plate

Picture tab

Use the Picture tab to define the position and dimensions of the cleat.

Cleat dimensions


	Description
1	Cleat height is used when the center line of the cleat profile is positioned higher than the rafter center line.
2	The distance from the cleat center line to the purlin edge. This distance only applies to gable ends. The default is `0 mm`.
3	Cleat width when the center line of the cleat profile runs parallel to the rafter.


	Description
1	The distance from the center of the cleat to the center of the rafter.
2	The distance from the center of the cleat to the end of the purlin when there are two purlins.

Cleat tab

Use the Cleat tab to define the properties and position of cleats and stiffeners, and rafter bolts and cleat rafter bolts.

Parts


Option	Description
Cleat profile	Select the profile from the profile catalog.
Stiffener	Define the thickness of the stiffener.


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.

Rafter bolt properties


Option	Description
Rafter bolt standard	Bolt standard for all bolts that connect the cleat to the rafter. To define the rafter bolt standard and rafter bolt tolerance, select to bolt the cleat to the rafter.
Rafter bolt tolerance	Gap between the bolts and rafter for all the bolts that connect the cleat to the rafter.
Assembly type	Location where the bolts should be attached.

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.

Cleat rafter bolt group dimensions

To define the rafter bolt group dimensions, first select to bolt the cleat to the rafter.


	Description
1	Horizontal bolt spacing.
2	Diameter of the bolts that connect the cleat to the rafter.
3	Cleat offset from the rafter center line.
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	Bolt edge distance. Edge distance is the distance from the center of a bolt to the edge of the part.

Cleat orientation


Option	Description
	Default The center line of the cleat is parallel to the rafter. AutoDefaults can change this option.
	The center line of the cleat profile is parallel to the rafter.
	The center line of the cleat profile is vertical to the rafter.
	The center line of the cleat is parallel to the rafter. A line stiffener is created. Define the stiffener cut dimensions.
	The center line of the cleat profile is vertical to the rafter. A square stiffener is created.

Stiffener cut dimensions

Define the dimensions for the line stiffeners or square stiffener.


	Description
1	Vertical chamfer dimension
2	Horizontal chamfer dimension
3	Horizontal cut dimension
4	Vertical cut dimension


	Description
1	Horizontal dimension
2	Vertical dimension

Cleat location


Option	Description
	Default The cleat is attached to the front of the purlin. Tekla Structures positions the cleat according to the purlin profile that is used. AutoDefaults can change this option.
	The cleat is attached to the front of the purlin.
	The cleat is attached to the back of the purlin.

Cleat attachment


Option	Description
	Default The cleat is welded to the rafter. AutoDefaults can change this option.
	The cleat is bolted to the rafter.
	The cleat is welded to the rafter.

Stays tab

Use the Stays tab to create and define the properties of stays, stay plates, and stay bolts.

Parts


Option	Description
Stay profile	Select the profile from the profile catalog.
Stay plate	Thickness, width, and height of the stay plate.
Stay angle	Thickness of the stay angle.


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.
Finish	Describes how the part surface has been treated.

Bolt properties


Option	Description
Purlin-stay bolt standard Rafter-stay bolt standard	Select the bolt standard for the bolts that connect the stays or rafter stays to the purlins.
Purlin-stay bolt tolerance Rafter-stay bolt tolerance	Define the gap between the bolts and holes for the bolts that connect the stays or rafter stays to the purlins.
Stay rotation	Define the stay angle rotation.

Location of stays


Option	Description
	Default Stays are not created. AutoDefaults can change this option.
	Stays are not created.
	Stays are created on both sides. Stay plates are created.
	Stay is created on the right. Stay plate is created.
	Stay is created on the left. Stay plate is created.
	Stay is created on the right. Stay plates are created on both sides.
	Stay is created on the left. Stay plates are created on both sides.
	Holes are created. Stays and stay plates are not created.

Stay attachment


Option	Description
	Default Stay is attached to the purlin web bottom. AutoDefaults can change this option.
	Stay is attached to the purlin web top.
	Stay is attached to the purlin web center.
	Stay is attached to the purlin web bottom.

Hole/bolt creation in stay


Option	Description
	Default One hole or bolt in the rafter. AutoDefaults can change this option.
	One hole or bolt in the rafter.
	When the hole or bolt in the stay is placed within a certain distance, defined in d, from another already existing hole or bolt in the rafter, these will be merged together. The distance d is defined in the overlap.dat file.

Stay plate attachment to haunch


Option	Description
	Default Stay plates are attached to haunches. AutoDefaults can change this option.
	Stay plates are attached to rafters. You must apply the connection above a haunch.
	Stay plates are attached to haunches.

Stay bolts


	Description
1	Bolt edge distance. Edge distance is the distance from the center of a bolt to the edge of the part.
2	Bolt edge distance. Edge distance is the distance from the center of a bolt to the edge of the part.
3	Number of bolts.
4	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.
5	Bolt edge distance from the stay edge.
6	Stay bolt distance to the rafter center line.
7	Stay plate edge distance from the rafter edge.
8	Bolt diameter.

Chamfer dimensions


	Description
1	Vertical chamfer dimension
2	Horizontal chamfer dimension

Chamfer shape


Option	Description
	Default Line chamfer AutoDefaults can change this option.
	No chamfer
	Line chamfer
	Convex chamfer
	Concave chamfer

Bolts tab

Use the Bolts tab to define the bolt group dimensions and the properties of the bolts that connect the cleats to the purlins.

Bolt group dimensions


	Description
1	Dimension for vertical bolt group position.
2	Bolt edge distance. Edge distance is the distance from the center of a bolt to the edge of the part.
3	Number of bolts.
4	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.


	Description
1	Dimension for horizontal bolt group position.
2	Bolt edge distance. Edge distance is the distance from the center of a bolt to the edge of the part.
3	Bolt spacing.

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 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.

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.

Bolt orientation


Option	Description
	Default Bolts are placed square to the main part. AutoDefaults can change this option.
	Bolts are placed square to the main part.
	Bolts are placed square to the secondary part.

Bolt holes


Option	Description
	Default Bolt holes are not created. AutoDefaults can change this option.
	Bolt holes are not created.
	Bolt holes are created in the gable end of the rafter flanges.