Abstract
A reciprocating constitutive model of cold-formed thick-walled rectangular steel tube was constructed by a reciprocating loading test and then used to determine the influences of strain hardening on the seismic behavior of the tube. A cold-formed thick-walled rectangular steel tube with a side range of 600–800 mm and thickness range of 16–22 mm was used as the research object. The mechanical properties and constitutive models at different positions, such as the weld, adjacent weld, corner, and flat regions, were investigated through a reciprocating loading experiment under seven loading patterns. The recommended values of Ramberg–Osgood model's cyclic hardening parameters were provided on the basis of a skeleton curve. Based on the experimental data, a refined constitutive model that involves monotonic loading, loading along the skeleton curve, unloading, and reloading was proposed and was compiled by applying the user-defined material subroutine of ABAQUS-UMAT. The simulation results of UMAT conformed well with the experimental results. Therefore, the proposed constitutive model is applicable to studies on the seismic behaviors of ultra-thick cold-formed rectangular steel tubes.
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