Concentrated approaches for nonlinear analysis of composite beams with partial interaction.
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Date
2021
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Abstract
Two plane displacement-based formulations with concentrated nonlinear effects for numerical
analysis of composite beams are presented here. The effects of geometric nonlinearity, plasticity
and partial shear connection are considered. In these two approaches, the co-rotational system is
defined to allow large displacements and rotations in the numerical model. The first formulation
is based to Strain Compatibility Method, where the sections strains are explicitly evaluated as well
as the slipping at the steel-concrete interface. Thus, the axial and flexural stiffness of the cross
section is determined in each step of the incremental-iterative process. The second methodology
considers rotational pseudo-springs at the finite elements ends to simulate of plasticity. Further-
more, the effects of partial interaction can not be simulated by the inherently rotational behavior
of the pseudo-springs. Thus, the cracking and partial interaction effects are approached through
effective moment of inertia defined by normative criteria. Four composite beams are simulated
with these two formulations and compared by the load-displacements paths. In all numerical re-
sult findings these formulations are closed and accurate to the experimental data presented in lit-
erature.
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Keywords
Concentrated formulations, Steel-concrete composite beams, Strain compatibility method, Pseudo-springs, Normative criteria
Citation
CARVALHO, T. A. de et al. Concentrated approaches for nonlinear analysis of composite beams with partial interaction. Ce/papers, v. 4, p. 715-722, 2021. Disponível em: <https://onlinelibrary.wiley.com/doi/full/10.1002/cepa.1353>. Acesso em: 29 abr. 2022.