Rigid offsets examples

Tekla Structural Designer
2021
Tekla Structural Designer

Rigid offsets examples

Rigid offsets example 1 - concrete column

Consider the two stack concrete column shown below - this has been inserted with its alignment properties set to bottom left so that the outer column faces remain flush despite a smaller section being introduced in stack 2.

Since solver elements for concrete columns always take into account any snap points or offsets, they will always be located at the centroid of each stack - thus they do not necessarily coincide with the insertion line used to position the column originally. In this example the centroid position shifts from one stack to the next which causes a “rigid offset” to be created automatically to connect the solver elements. Similar rigid offsets would also be created as required to connect incoming beams into the column centroids.

Tip: To see solver elements, solver nodes and rigid offsets: open a Solver View, and then in Scene Content select 1D Elements> Geometry & RigidOffset and Solver Nodes> Geometry.

As a consequence of this method of modeling, you are freer to simplify the grid layout in order to create the structure more effectively, and then employ column offsets to position each column exactly, knowing that during analysis the program automatically assumes the column is located at its centroid as shown in the plan view.

Rigid offsets example 2 - concrete beam

Consider the two span concrete beam shown below - this has been inserted with both major and minor axis offsets applied to span 2 only.

Note: For concrete beams:
  • The minor snap points and offsets are structurally significant and have an effect on the positioning of the 1D solver elements.
  • The major snap points and offsets are not structurally significant.

In the minor direction beam solver elements are always located at the center of each beam section - as beam widths or minor offsets may vary, this may result in the introduction of lateral rigid offsets to make the connection between spans.

In the major direction beam solver elements are always created at the same level as the insertion line used to position the beam.

Consequently, for this particular example a lateral rigid offset is required to make the connection between the two spans.

Tip: To see solver elements, solver nodes and rigid offsets: open a Solver View, and then in Scene Content select 1D Elements> Geometry & RigidOffset and Solver Nodes> Geometry.
Esta informação foi útil?
Anterior
Seguinte