高强度结构钢材单调荷载作用下的本构模型研究

发布时间：2018-01-24 15:28

本文关键词： 高强度钢材单调荷载本构模型应力-应变非线性　出处：《工程力学》2017年02期 　论文类型：期刊论文

【摘要】：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。
[Abstract]:The constitutive model of steel under monotonic load is the basis of structural analysis. In order to calculate the response of high-strength steel structure and analyze the mechanical behavior of members more accurately, it provides a reference for engineering designers to apply high-strength steel. On the basis of summarizing the existing experimental studies and carrying out a large number of tensile tests, the parameters of the multifold constitutive model of high strength steel are updated in this paper. The nonlinear constitutive model for high strength steel was calibrated on the basis of Ramberg-Osgood model. It is proved that the nonlinear constitutive model can well simulate the stress-strain relationship of high-strength steel under monotonic loading. In order to give consideration to accuracy and efficiency, a modified multi-fold constitutive model is proposed. At the same time, the constitutive model of high strength steel is relatively simple.
【作者单位】：土木工程安全与耐久教育部重点实验室清华大学土木工程系;华东建筑设计研究院有限公司;
【基金】：国家自然科学基金项目(51478244);国家自然科学基金优秀青年基金项目(51522806)
【分类号】：TU511.3
【正文快照】： 高强度结构钢材(名义屈服强度fy≥460 MPa)通过高纯净化、微合金化或热机械轧制技术(TMCP),在提高材料强度的同时,也具有了良好的韧性和焊接性能[1 3]。利用高强钢的优势,可以有效减小钢结构构件截面尺寸和板厚,从而降低自重,适应更大的跨度,改善结构的焊接质量。因此国内外

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