A model for composite steel-concrete structures

Material models for concrete and for interface-elements for the numerical simulation of nonlinear behaviour of composite steel-concrete structures are presented. The concrete model can be decomposed into the individual contributions of plain concrete, reinforcement and tension-stiffening. These in rum are based on a fracture-energy approach and a softening/hardening plasticity; in order to derive a macroscopic, structure oriented material model the number of parameters has been kept as low as possible. These parameters can be identified using EC2- and EC4-standard or CEB-FIP recommendations. A comparison between numerical and experimental results reveal that they are consistent with each other.