Influence of residual stress models prescribed in design codes for steel I-section behavior.
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2022
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Resumo
Non-uniform cooling of steel cross-sections during the manufacturing process generates a
state of residual stresses in the cross-section. Design codes describe the distribution of
these stresses in different ways. This work aims to numerically investigate the influence of
these models on the behavior of bare steel and steel-concrete composite sections by the
curves: flexural stiffness-bending moment, moment-curvature and yield curves (initial and
full yield). These procedures are important for the study of the simplified curves used in
some methodologies of the refined plastic hinge method (RPHM) analysis. The study will use
the strain compatibility method (SCM), where, if the axial strain of the cross-section point is
known, the section stiffness is obtained using the tangential Young's modulus derived from
the materials constitutive relationship. A fiber discretization algorithm is applied and the
residual stresses are explicitly inserted into the fibers automatically. The methodology was
calibrated using the moment-curvature relationship and the flexural stiffness-bending
moment curve. These results were numerically stable and good convergence with literature
data was obtained. In general, the residual stress model of the American standard (AISC,
2016) defines a larger elastic region within the interaction diagrams then European model
(CEN, 2005). The results obtained showed that the initial yield curves for steel I-sections
under minor axis bending require revision for application to RPHM, mainly due to the loss of
symmetry in relation to the ''M'' axis in the normal force-bending moment (''NM'')
interaction diagram.
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Steel I-sections, Residual stresses, Design codes, Moment-curvature relationship, Yield curves
Citação
LEMES, I. J. M. et al. Influence of residual stress models prescribed in design codes for steel I-section behavior. Revista Internacional de Metodos Numericos para Calculo y Diseno en Ingenieria, v. 38, n. 4, artigo 37, out. 2022. Disponível em: <https://www.scipedia.com/public/Lemes_et_al_2022b#>. Acesso em: 15 mar. 2023.