CONCENTRATED NUMERICAL APPROACH FOR SIMULATION OF STEEL-CONCRETE COMPOSITE BEAMS WITH PARTIAL SHEAR CONNECTION

Resumo

The present work aims at the implementation and validation of a two-dimensional displace-
ment-based numerical formulation for nonlinear analysis of steel-concrete composite beams with de-
formable shear connection. A finite element corrotational formulation is adopted in order to allow large

displacements and rotations in the numerical model. The degradation of the axial and flexural stiffness is
determined exclusively at the nodal points of the structural discretization, characterizing the concentrated
plasticity. In the cross sections level, the Strain Compatibility Method is used to capture the axial strains
in the component members of the section as well as the slipping at the steel-concrete interface. Thus,
the constitutive models of materials under normal stresses and shear connection elements are described
by continuous functions. For validation of the proposed numerical formulation, the results obtained
are compared with numerical and experimental data available in the literature. Since the model proposed
here is based on the concentrated simulation of nonlinear effects, a finite element refinement study is also
performed. The numerical responses obtained in this paper are closed to experimental and numerical data
presented in literature.