Accounting for lateral loading in chasedown results

Tekla Structural Designer
2020
Tekla Structural Designer

Accounting for lateral loading in chasedown results

It is important to note that the chasedown analysis procedure is only valid for gravity loads. The chasedown analysis results for any lateral loading case (wind / EHF) or from the direct analysis of any combination that includes a lateral loading case are not valid.

Therefore in order to generate the design forces mentioned above, the chasedown analysis results are merged with the 3D building analysis combination results as follows:

  1. Start with the building analysis combination result
  2. Identify all gravity cases used in the combination and the relevant load factor
  3. For each included gravity loadcase:
    1. Subtract the 1st order linear building analysis result multiplied by the relevant load factor
    2. Add the chasedown result multiplied by the relevant load factor
  4. For results with Imposed load reduction, subtract the relevant % of the chasedown result for each reducible loadcase.

Following this procedure means that chasedown analysis of lateral loading cases or combinations is not required.

Note:

This procedure is only applied to beam, column, and wall-line results, but not to 2D nodal results. For this reason it is not possible to calculate or display 2D element chasedown results for combinations that include lateral load cases.

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