For the Initial Strain from Other LC/CO function, I cannot keep track of the internal forces. How is this function represented internally?

Answer

The function transfers the deformation from one load case or a load combination into the other. The internal forces and stress states are not transferred at the same time.

Insofar as the load case or load combination is based on the same structural system, no significant internal forces should result. The FE division in the structure could have an influence here and should be checked, if necessary.

If the initial strain is transferred into a load case or a load combination that is based on another structural system, additional internal forces may result due to the prevented deformation (restraint). In the example (Figure 02), the initial strain of two consecutive single-span girders is transferred to a continuous beam. The deformation on the intermediate column is prevented and a moment is generated (Figure 03). The magnitude of the resulting moment can be understood by cutting free the structure and applying the prevented deformation as an imposed deformation on the load side.

Keywords

Initial strain Restraint Construction states System modification

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