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准确的材料滞回本构模型是保证弹塑性地震反应预测准确性的基本前提,如果本构模型选取不当,会对计算结果产生较大影响。为此该文提出了奥氏体不锈钢考虑循环强化作用的单轴滞回本构模型,包括骨架准则及滞回准则。建立数学模型描述奥氏体不锈钢在循环荷载作用下的受力性能。根据提出的理论模型并利用ABAQUS用户材料子程序UMAT,采用Fortran语言二次开发了能够进行循环荷载下奥氏体不锈钢计算分析的程序。通过与试验结果进行对比,表明提出的模型能够准确描述奥氏体不锈钢材料的滞回行为,兼顾计算精度和效率,为奥氏体不锈钢结构体系强震分析提供有力工具。
Accurate material hysteresis constitutive model is the basic precondition to ensure the accuracy of elastoplastic seismic response prediction. If the constitutive model is not properly selected, it will have a significant impact on the calculation results. In this paper, a uniaxial hysteresis constitutive model of austenitic stainless steel considering cyclic strengthening is proposed, including the skeleton criterion and the hysteretic criterion. A mathematical model was established to describe the mechanical properties of austenitic stainless steel under cyclic loading. According to the proposed theoretical model and the ABAQUS User Material Subroutine UMAT, a program was developed for the analysis of austenitic stainless steel under cyclic loading using the Fortran language. The comparison between the experimental results and the experimental results shows that the proposed model can accurately describe the hysteretic behavior of austenitic stainless steel with both accuracy and efficiency, providing a powerful tool for the analysis of strong earthquakes in austenitic stainless steel structural systems.