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钢材在单调荷载作用下的本构模型是进行结构分析的基础。为了更为准确地计算高强钢结构响应和分析构件的受力性能,为工程设计人员应用高强钢提供参考,该文在总结已有试验研究、开展大量拉伸试验的基础上,更新了高强钢多折线本构模型的参数,以Ramberg-Osgood模型为基础标定了适用于高强钢的非线性本构模型。通过和试验数据的对比,证明非线性本构模型能够很好地模拟高强钢在单调荷载作用下的应力-应变关系。为了兼顾准确性和效率,该文还提出了修正的多折线本构模型,在反映高强钢非线性的材料性能的同时本构模型也相对简单。
The constitutive model of steel under monotonic loading is the basis of structural analysis. In order to calculate the response of high-strength steel structure more accurately and analyze the mechanical performance of high-strength steel structure, this paper provides a reference for engineering designers to apply high-strength steel. Based on the conclusion of the existing experimental research and the large number of tensile tests, Based on the Ramberg-Osgood model, the nonlinear constitutive model for high strength steel is calibrated. The comparison with the experimental data shows that the nonlinear constitutive model can well simulate the stress-strain relationship of high strength steel under monotonic loading. In order to balance the accuracy and efficiency, the paper also proposed a modified multi-line constitutive model, which is relatively simple to reflect the material properties of high-strength steel at the same time as the constitutive model.