Experimental and constitutive model study of structural steel under cyclic loading
Experimental and constitutive model study of structural steel under cyclic loading
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循环荷载下结构钢的试验及本构模型研究
DOI：
10.1016/j.jcsr.2011.02.011
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发表时间：
2011-08-01
影响因子：
4.1
通讯作者：
Wang Yuanqing
中科院分区：
文献类型：
--
作者：
Shi Yongjiu;Wang Meng;Wang Yuanqing
为了研究结构钢的极低周疲劳性能，寻找合适的本构关系，对Q235B和Q345B钢进行了50次极低周疲劳试验。讨论了Q235B和Q345B结构钢的力学性能，包括单调加载性能、滞回加载性能和滞回判据。在充分认识结构钢循环行为的基础上，提出了循环荷载下结构钢单轴简化本构关系。然后利用有限元软件ABAQUS提供的用户子程序接口UMAT，将单轴钢的本构关系开发为用户自定义材料。通过引入纤维梁单元法，将钢的单轴本构模型用于钢结构分析。通过对Q235B和Q345B钢框架在不同荷载体系下的试验数据进行对比，验证了本文所提出的模型的正确性，可用于钢框架的非线性时程分析。试验和分析结果均表明，Q235B和Q345B钢在循环加载和单调加载下的响应有较大差异，屈服后循环加载下的骨架曲线远高于单调加载。循环次数和循环幅值都严重影响钢材的断裂韧性。当结构钢承受循环荷载时，颈缩和断裂行为会提前发生，这意味着累积损伤使钢的延性降低。(C)2011爱思唯尔有限公司保留所有权利。
In order to study extremely low cycle fatigue performance of structural steel and find a suitable constitutive relationship under cyclic loading, a total of fifty Q235B and Q345B steel extremely low cycle fatigue experiments have been carried out. The mechanical behavior of Q235B and Q345B structural steel including monotonic loading behavior, hysteresis loading behavior and hysteresis criterion are discussed. With fully recognized cyclic behavior of structural steel, a uniaxial and simplified constitutive relationship of structural steel under cyclic loading is proposed. Then the uniaxial steel constitutive relationship is developed as user-defined material based on the user subroutine interfaces UMAT provided by Finite Element Software ABAQUS. By introducing the fiber beam element method, the steel uniaxial constitutive model can be used for steel structural analysis. With comparison of Q235B and Q345B tests data under various loading systems, the model proposed in this paper is proved correct and can be applied in nonlinear time history analysis of steel frame. Both tests and analysis results show that the response of Q235B and Q345B steel under cyclic loading and monotonic loading are quite different, and the skeleton curve under cycle loading is much higher than monotonic loading after steel yielding. Both cyclic loops and amplitudes seriously affect the fracture ductility of steel material. While the structural steel bearing cyclic loading, the necking and the fracture behavior will occur ahead of time, it means that the cumulative damage makes the ductility of steel reduced. (C) 2011 Elsevier Ltd. All rights reserved.