A parametric study deals with shear and bending moment capacity of composite concrete beams is presented. The analytical results compare satisfactorily with the experimental ones. Comparison between the results obtained by the finite element computer program and available experimental results of composite concrete beams is made. The validity of the proposed modeling and the capabilities of the computer program written are examined by analyzing several published experimental reinforced concrete specimens. Shear-slip is modeled by using shear transfer interface elements with appropriate stiffness values. Bond-slip and dowel action is modeled by using fictitious linkage elements with two springs at right angles. Reinforcement is represented by one-dimensional bar elements.

A two-dimensional plane stress finite element type is used to model the concrete. The steel reinforcement is assumed to be in a uniaxial stress state and is modeled as a bilinear material. Concrete is treated as an orthotropic material with smeared rotating crack model. Material nonlinearities as a result of nonlinear response of concrete in compression, crushing and cracking of concrete, strain softening and stiffening after cracking, yielding of reinforcement, bond-slip, shear-slip, and dowel action between the precast concrete beams and the cast-in-situ slabs are considered. To study the nonlinear response of composite concrete beams, a finite element analysis is presented in this work.

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