3. A to d modeling

The first 4 models rigorously use the structural modification method as proposed by Mr. Corus, namely that the basic structure is described in modal form (a base of natural modes extended on a simplified numerical model) and the modification is described in the form of a physical model. The calculation elements implemented here make it possible to couple the two aspects.

For more details, refer to documentation U2.07.03 (section 3).