Lifting anchor (80)

Lifting anchor (80) creates two lifting anchors (or anchor groups) for a concrete part and places them symmetrically on either side of the part’s center of gravity.


	Description
1	30% of part length (default)
2	Center of gravity

Objects created

Lifting anchors (2 or more)
Recesses for anchors (optional)

Use for


Situation		More information
		Straight anchor with straight legs (Type A in the anchor properties file, see Anchor properties from a file)
		Straight anchor with L-shaped legs (Type D)
		Angle anchor with straight legs (Type B)
		Angle anchor with L-shaped legs (Type C)
		Custom components as anchors
		Anchors recessed into the part.
		Skew and/or rotated anchors

Before you start

Create the concrete part.

Selection order

Concrete part.

Picture tab

Use the Picture tab to define anchor properties, to use custom components as anchors, to create recess and define recess dimensions.

Lifting anchor properties

The properties of lifting anchors are:


Option	Description
Create anchors	Select how the anchors are created.
Anchor dimensions	The options are: Use dialog values Select from file, see Anchor properties from file. You need to enter different dimensions for different anchor types.
Distance from	Set the anchor distribution from the center of gravity or part end. You can set the distance either by length or by percentage of the length.
	The distance between an anchor (or anchor group) and the center of gravity of the part. Default is 30% of the part length.
	The distance between an anchor (or group) and the center line of the part.
Number of bars/spacings	The number and spacing of anchors in a group. If the spacing varies, enter each value individually.
Custom	See Custom component as lifting anchor.
Component
Custom settings
Up direction
	The option to define if the anchors are recessed into the part.
	The skew angle of anchors. Anchor heads are skewed towards the part’s center of gravity.
Rotate anchor	The option to rotate anchors. The options are: No: Anchors parallel to the part. Yes: Anchors perpendicular to the part.
Grade	Strength of the steel used in the anchor.
Size	Diameter of the anchor bar.
Name	Name that is shown in drawings and reports.
Prefix, Start number	Prefix and start number for the part position number.
Class	Part class number.

Side

Select the side of the part where Tekla Structures creates the anchors:


Option	Description
	Front
	Top Default
	Back
	Below
	Start end
	Finish end

Recesses

Select one of the following options to define if the lifting anchors are recessed into the concrete part:


Option	Description
	Anchors on the surface of the part. Default
	Anchors recessed into the part.

If you choose to recess the anchors into the part, use the following fields to define the shape and dimensions of the recesses:

Custom component as lifting anchor

To use custom components as lifting anchors:

In the Custom list box, select Yes.
Click the ... button next to the Component field to open the Select component dialog box.
Browse for the custom component you want to use as lifting anchor.

The component you select must be a custom part and have two or three input points.

The component should be created so that the first and the second input points are on the concrete surface and along the longitudinal axis of the concrete part.

Tip:
For more information on how to create custom parts that can be used as lifting anchors, see Creating standard embeds for global use.
Select the component and click OK.
To use saved custom component properties, select the saved properties file in Custom settings.
If the anchor position is not correct, select another option in the Up direction list box.

Rebar assembly tab

Use the Rebar assembly tab to add the created reinforcement as a rebar assembly to the cast units.

Create as rebar assembly

You can add the created reinforcement as a rebar assembly to the cast units with a predefined assembly type, name, prefix, and start number.


Option	Description
Create as rebar assembly	Select Yes to create all reinforcement as one rebar assembly, and to include it to the cast unit of the input part.
Add to existing rebar assembly	Do not add: New rebar is added as a rebar assembly to the cast unit. As single bars: Add all new rebars directly into an existing rebar assembly as rebars. As sub-assembly: Add all new rebars to their own new rebar assembly, which is then included as a sub-assembly to the main rebar assembly.
Rebar assembly type	Select the rebar assembly type. If you do not select the type, the default value of the rebar assembly is used.
Name, Profile, Start number	Define the name, profile, and start number. If you do not define these, the default values of the rebar assembly are used.

Anchor properties from file

You can define lifting anchor properties by entering values in the dialog box, or you can create a file containing the anchor properties you want to use. Use any standard text editor to create the file and save it as LiftingAnchors.dat in the model folder.

To use the anchor properties you define in a file:

In the Lifting anchor (80) dialog box, select Select from file from the Anchor dimensions list box.
Click the ... button to browse for the file.

Example

Create a row in the file for each lifting anchor. Enter the following properties, separated by spaces:

Anchor capacity [kN], including safety and material factors
Type [A, B, C, or D], see the Use for table.
Grade [characters]
Size [characters]
Anchoring length 1 [mm]
Anchoring length 2 [mm]
Protruding dimension of the anchor outside the part [mm]
Penetrating dimension of the anchor inside the part [mm]
Bending radius [mm]
Hook length [mm] (0 = no hook)
Angle of leg 1 [degrees]
Angle of leg 2 [degrees]

Here is an example of a lifting anchor file (Tekla Structures ignores the comments enclosed in /* */):

Tekla Structures will use the first anchor in the file that:

Has the shape and type you define using the graphic list boxes in the Lifting anchor (80) dialog box.
Can carry the part’s weight with other identical anchors. The total number of anchors is two times the number you specify in the Number of bars field.