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中文摘要：
高强度结构钢材在实际钢结构工程中已经得到广泛应用，国内外学者已经进行了一些研究，但对于循环荷载下高强度钢材本构关系的研究还很缺乏。通过对17个Q460D高强度结构钢材试件进行14种不同加载制度的单调和循环加载试验，得到不同加载制度下的应力-应变关系，探讨不同加载历史对其本构关系的影响，研究其材料本构模型、力学性能、破坏模式、变形和延性特征以及损伤退化特性。基于Ramberg-Osgood模型，拟合得到Q460D高强度结构钢材在循环荷载下的应力．应变关系骨架曲线；在Chaboche钢材塑性本构模型的基础上，通过试验标定Q460D高强度结构钢材的循环加载本构模型参数，并结合有限元程序ABAQUS对上述试验进行准确模拟。研究结果可为准确分析计算高强度钢材钢结构在地震作用下的受力性能提供基本前提。
英文摘要：
High strength structural steel has been widely used in many steel structures. Although there are some studies on high strength steel structures, the constitutive relationship of high strength steel under cyclic loading has not yet been sufficiently investigated. 17 specimens of Q460D high strength structural steel have been tested under monotonic and cyclic loading with 14 different loading programs, and the corresponding stress-strain relationships under these different loading programs have been obtained. The high strength steel constitutive model, mechanical properties, failure modes, deformation, ductility and the cumulative damage deterioration have been studied. The stress-strain skeleton curves of Q460D high strength structural steel under cyclic loading have been obtained by curve fitting using the Ramberg-Osgood model. Based on the Chaboche plastic constitutive model for steel, the key parameters of the stress-strain constitutive model of Qg60D high strength structural steel under cyclic loading have been calibrated, and the above tests have been accurately simulated by using ABAQUS. The results are significant for accurately analyzing the behaviour of high strength steel structures under earthquakes.
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