Consider the cross$-$sections illustrated in the next slide. Implement a cross$-$sectional analysis based on a layered discretisation of the cross$-$section as required at the following question parts.

$1)$ Develop the implementation of a nonlinear analysis to estimate the nonlinear response of the composite steel$-$concrete section $($please use material nonlinear models provided in the support files$).$ Provide the details of the numerical implementation with clear explanations of all

steps.

$2)$ Discuss the key geometric and material parameters that affect the flexural response of each section and of the member as well as their ductility assuming a simply$-$supported configuration. Consider both service and ultimate loading conditions.

The discussion needs to be supported by data, for example, for the cross$-$sectional response the use of moment$-$curvature diagrams will be suitable.Typical composite steel$-$concrete section $($floor beam$)$

Typical composite steel$-$concrete section $($concrete filled tube$)$

Typical steel section