One of the basic parameters for dynamic analysis of structures according to modern design regulations is the behavior factor, i.e. the factor. For different types of structural system configurations and ductility classes, in Eurocode 8, upper limits for this parameter are given. When it comes to Composite Steel-Concrete Frames, results in this area are relatively limited.

In this paper, using a static non-linear analysis, an evaluation of the factor has been performed for different types of configurations of Composite Steel-Concrete Moment Frames (Composite Frames). The individual components that make up the q-factor are determined and their variations are interpreted depending on the frame configuration. The influence of specific parameters, such as the span and number of stories of the frame, and member local characteristics are studied. The geometrical and material nonlinearity of composite cross sections are taken into account with the concept of distributed plasticity. The obtained results are compared with the proposed values ​​for Bare Steel Moment Frames.