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How to model a tension bar/ tie rod

The countarpart of a tie rod is a compression bar.

  • Select the bar(s) you want to define as a tie rod.
  • Click on.
  • Select .

Using function

In some models, tie rods defined with the button  can result in interation problems because the algoritm deciding which tie rod is working and which one is not, is too strict. The alternative is using a function where you can define your own limit.

  • Select the bar(s) you want to define as a tie rod.
  • Click on.
  • With My’ and Mz’ choose ‘Free’.
  • With Nx’ choose ‘Function’ and click on .
  • Click on  and give the function a name.
  • Enter a small value with ‘<0’ and set ‘>0’ to ‘Fixed’.
    The definition of ‘small’ depends on the model. For some models it will be 0,1 kN/m, for others it will be 1kN/m. Choose a value and calculate the structure. If it calculates, divide the value for example by 2 and try again. You’ll see that after a few attemps, the compressive force in the tie rods will be neglectable in comparison to the tensile force.
  • Assign the function also to the end of the bar.

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