Composite Steel and Concrete Construction Design of composite frames

The calculation bases and expressions used to verify the dimensioning of composite beams with solid web, possibly coated, and with open web, have been provided respectively in articles [C2561] and [C2568] , the dimensioning of composite columns in article [C2562] , the dimensioning of beam-post composite connections and the calculation of their rotational rigidity in article [C2563] .

In this last article, the modeling of connections within a mixed framework has been characterized according to the classification of the connections, in strength or in stiffness, and according to the type of global analysis used for the framework, elastic, rigid-plastic or elastic-plastic.

What remains to be done, therefore, is to specify the overall analysis methods for determining the forces exerted on the above elements when they are part of a framework subjected to combinations of permanent and variable actions (at ULE and SLE).

In general, three-dimensional frame structures with steel and/or composite elements can be subdivided into several flat frames that can be considered as transversely supported at the three-dimensional nodes. This assumption is systematically applied.

To the best of our knowledge, there is no software capable of handling the case of three-dimensional mixed frames, and indeed the EN 1994-1-1 does not deal with the case of composite beams or composite columns...