This paper presents an implementation of a three-dimensional nonlinear
finite element model for evaluating the behavior of reinforced concrete slabs
under centric load. The concrete was idealized by using eight-nodded solid
elements. While flexural reinforcement and the shear were modeled as line
elements, a perfect bond between solid elements and line elements was
assumed. The nonlinear behavior of concrete in compression is simulated by
an elastoplastic work-hardening model, and in tension, a suitable post-cracking model based on tension stiffening and shear retention models is
employed. The steel was simulated using an elastic-full plastic model. The
validity of the theoretical formulations and the program used was verified
through comparison with available experimental data, and the agreement has
proven to be good. A parametric study has been also carried out to investigate
the influence of the slab thickness on column-slab connection response