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TechNotes

  1. Casa
  2. TechNotes
  3. 3D estrutural
  4. Modelagem de vigas empilhadas

Modelagem de vigas empilhadas

How to model stacked beams using Rigid Links

Simply specify the member “Modelo” como “Rigid Linkto create a member that acts as a Rigid Link. When this is done you will see that the rigid link is drawn with a light-grey color and has an “R” symbol beside it:

Rigid Link Members

Links rígidos podem ser úteis para definir conexões rígidas entre estruturas que envolvem vigas ou membros empilhados. They are often thought of as imaginary stiff links that join members so they can translate and/or rotate together. Um link rígido também pode ser usado para controlar manualmente os deslocamentos dos membros. Além disso, você pode alterar a fixidez / liberações no link rígido para controlar quais forças e efeitos ele tem sobre o que se conecta.

Looking at the analysis results, you can see that as the top beam is loaded, and deflects, so does the beam below:

stacking beam elements results in structural analysis

Member design checks will still run, Contudo, it is important to consider the limitations of the software in understanding the unbraced lengths and member end fixities. In this scenario, the Lb should be adjusted according to your design needs.

design check structural analysis of stacked beam elements

C3.1.2.1-9 2: Using Custom Shapes in Section Builder

An alternative method to the above is using the SkyCiv Section Builder to model two models on top of each other, and treating it as one element:

stacked-beams-section-builder-method

This will use FEA to calculate the geometric properties of this ‘single’ seção. It will then use those geometric properties along with the entire line element. More on this method can be viewed on the following documentation page: Composite and Built-up Shapes in SkyCiv

Detalhes e parâmetros do modelo

When modeling the two methods together, the results are quite consistent for deflection:

stacked-beam-tech-note-result-comparison

Since the members are only linked at certain points along the beam, there is a variance in the connectivity of the beams. In the bottom (Section Builder Method), the element is treated as one piece, whereas in the Rigid Link method, it is only connected at 3 points along the beam’s span.

stacked-beam-tech-note-result-comparison-analysis

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