Modelling non-linear cyclic stress-strain behaviour of stainless steel reinforcing bars

Abstract

This paper presents a newly calibrated set of uniaxial cyclic material parameters for stainless steel rebars, tailored for modelling reinforced concrete structures using the constitutive formulations Steel02 and Hysteretic in OpenSees. The study provides new stress-strain data from 84 tests, including monotonic tension, compression and cyclic loading of stainless steel rebars, hot-rolled and cold-rolled austenitic EN 1.4301 and hot-rolled lean duplex EN 1.4482, with B500C carbon steel rebars tested for comparison. Rebars of 12 mm and 16 mm diameter were tested across slenderness ratios L/D = 5, 8, 10, 12, 15 to capture the influence of inelastic buckling and strain amplitude on cyclic behaviour. The uniaxial material models were calibrated using truss and beam-column rebar representations, suitable for fibre-based and continuum modelling of reinforced concrete structures. The Hysteretic model is recommended for fibre-based simulations, as it more accurately reproduces the experimental response, with mean peak tensile and compressive stress errors of 1% and -7%, respectively. Conversely, Steel02 is more suitable for continuum simulations, as it better captures geometric and nonlinear effects under cyclic loading, yielding mean peak tensile and compressive stress errors of -0.1% and 3%, respectively. Numerical simulations of reinforced concrete columns subjected to cyclic loading were conducted to validate the calibration methodology, confirming its robustness and the suitability of the calibrated parameters for accurate nonlinear and parametric modelling of reinforced concrete structures.

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ORCID for S. Afshan: orcid.org/0000-0003-1048-2931

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