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FLEXIBILITY-BASED FIBER BEAM-COLUMN ELEMENT AND ITS PARAMETRIC ANALYSIS
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摘要: 基于柔度法和纤维模型的基本思想，应用Opensees软件，对梁柱单元应用于钢管混凝土柱的建模方法进行研究，在此基础上，对单元参数进行分析，探讨材料本构关系、纤维截面网格划分、积分点数量等参数对模拟精度及计算效率的影响。通过与试验对比，结果表明，受约束混凝土本构关系的下降段和钢材本构关系的强化段是影响单元准确性的主要因素，而网格划分和积分点数量的影响则主要体现在计算效率方面。研究将为基于柔度法的纤维梁柱单元在组合结构中的应用提供依据。Abstract: Based on flexibility and fiber model,the beam-column element of the modeling methods for concrete-filled steel tube columns is researched and a parametric analysis is carried out by Opensees software.The effects of the constitutive relationship of material,the mesh division of fiber cross-section and the number of integration points on the simulation precision and the calculation efficiency are discussed.The results show that the descending section of confined concrete constitutive relationship and the enhancing section of steel constitutive relationship are the main factors which affect the accuracy of hysteretic model.On the other hand,both the mesh division of fiber cross-section and the number of integration points affect the calculation efficiency.The research can supply a theoretic basis for the use of this sort of element in a composite structure.
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Mazzoni S,Mckenna F,Scott M H,et al.Opensees Command Language Manual[R].PEER,University of California,Berkeley:2004. [2] Mander J B,Priestly M J N,Park R.Theoretical Stress-Strain Model for Confined Concrete [J].Journal of Structural Engineering,1988,114(8): 1807-1826. [3] 韩林海.钢管混凝土结构理论与实践[M].2 版.北京:科学出版社,2007. [4] Kent D C,Park R.Flexural Members with Confined Concrete[J].J Strut Div ASCE,1971,97(ST7): 1969-1990. [5] 沈聚敏,王传志,江见鲸.钢筋混凝土有限元与板壳极限分析[M].北京:清华大学出版社,1993. [6] Ahmed Elremaily,Atorod Azizinamini.Behavior and Strength ofCircular Concrete-Filled Tube Columns [J].Journal of Constructional Steel Research,2002,58: 1567-1591. [7] Ansgar Neuenhofer,Filip C Filippou.Geometrically Nonlinear Flexibility-Based Frame Finite Element [J].Journal of Structural Engineering,1998(6):704-711. [8] 郑山锁,李磊,王斌.型钢与混凝土界面剪力传递能力[J].工程力学,2009,26(3): 148-154. [9] 郑山锁,李磊,邓国专.型钢高强高性能混凝土梁粘结滑移行为研究[J].工程力学,2009,26(1): 104-112. 期刊类型引用(5)
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