Modify assemblies

Added May 4, 2021 by Tekla User Assistance

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Modify assemblies

Modify assemblies

Change the assembly main part

The main part(1) part that exists in a building object and that determines the position number for the assembly or cast unit and the direction of assembly or cast unit drawings

(1) Main part can be an assembly main part or a cast unit main part.

(2) input part that the user selects first when creating a component

(2) Connections and details always have a component main part.

in a steel assembly has other parts welded or bolted to it. By default, the main part is not welded or bolted to any other parts. You can change the main part in an assembly.

  1. If needed, check what is currently the main part of the assembly.

    Use the Inquire tool to check which objects belong to a particular assembly.

  2. Ensure that the Select objects in assemblies selection switch is active.
  3. On the Steel tab, click Assembly > Set as main object.
  4. Select the new main part.

    Tekla Structures changes the main part.

Change the main assembly in a nested assembly

When you join two or more assemblies together, the assembly with the largest volume becomes the main assembly. You can change the main assembly in a nested assemblyassembly that consists of several assemblies on many assembly levels

Nested assemblies include elements that are manufactured as sub-assemblies.

at any time.

  1. Select the new main assembly.
  2. Right-click and select Assembly > Set as New Main Sub-Assembly .

Remove objects from an assembly

  1. Select the part or sub-assemblyassembly in a nested assembly that is subordinate to a parent assembly

    you want to remove.
  2. Right-click and select Assembly > Remove from Assembly.

Check and highlight objects in an assembly

Use the Inquire tool to check which objects belong to a particular assembly.

  1. On the ribbon, click the down arrow next to , and then select Assembly objects.
  2. Select a part that belongs to an assembly.

    Tekla Structures highlights the other parts that belong to the same assembly. The following colors are used:

    Object type

    Highlight color

    Concrete - main part


    Concrete - secondary part




    Steel part - main part


    Steel part - secondary part


Explode an assembly

When you explodeto ungroup the objects that are parts of another object or a component

In Tekla Structures, it is possible to explode components, cast units, assemblies, bent plates, parts that have attached parts, and drawing shapes and plugins.

The exploded objects cannot be reverted back to the original group.

a nested assembly, Tekla Structures breaks the assembly hierarchyarrangement of assemblies that describes the manufacture and erecting of the actual assembly to be built

level by level, always starting from the highest level. You need to use the Explode command several times to break a nested assembly back to single parts.

You can also explode sub-assemblies to single parts without breaking the entire assembly hierarchy.

  1. Select the assembly or sub-assembly you want to explode.
  2. Do one of the following:
    • To explode the entire assembly, right-click and select Assembly > Explode.

    • To only explode the sub-assembly, right-click and select Assembly > Explode Sub-Assembly.

Assembly examples

Column corbel

A column corbelconcrete part representing a structure that projects from the face of a concrete part and that serves as a support for an overhanging part and connects the parts

is fabricated in one workshop, and then attached to the column in another workshop. Model the corbel as a sub-assembly of the column. Then create an assembly drawingdrawing that shows fabrication information for a basic or a nested assembly, including bolts and welds, and that is generally used at the workshop

Assembly drawings show how parts are located in an assembly. They contain the parts of the assembly presented in one or more views.

for each workshop: one assembly drawing showing how the corbel is welded together, another assembly drawing showing how the corbel and the other part are welded to the column.

(1) Drawing 2, Workshop 2

(2) Drawing 1, Workshop 1

Complex truss

Model the halves of a complex truss as assemblies. Create assembly drawings for the workshop to fabricate the truss halves. Then create another assembly drawing showing how the halves should be joined on site.

Built-up profile

In a frame of built-up columns and beams, each built-up profile can be a sub-assembly. You can create an assembly drawing showing the entire frame, and separate drawings showing how the columns and beams are constructed.

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