Abstract
A steel-concrete composite fiber beam model is developed in this paper, which can divide the composite sections into fibers and the user-defined uniaxial hysteretic material constitutive model can be incorporated in subprogram UMAT provided by ABAQUS. The steel-concrete composite fiber beam model can be used to perform global elasto-plastic analysis of composite frames with full connections subjected to the combined action of gravity and cyclic lateral loads. The model is verified through a number of experiments showing that the composite fiber beam model developed by authors possesses good accuracy and wide applicability compared with the traditional finite element model. Although the fiber beam model neglects the slip between steel beam and concrete slab, the accuracy of global predictions of steel-concrete composite frames is not affected. So the developed steel-concrete fiber beam model possesses modelling simplicity and calculation efficiency, and is suitable for the seismic analysis of steel-concrete composite frames.
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