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Simplified Nonlinear Simulation of Rectangular Concrete-Filled Steel Tubular Columns
| 题名： | Simplified Nonlinear Simulation of Rectangular Concrete-Filled Steel Tubular Columns |
| 正文语种： | eng |
| 作者： | Tao, Zhong;Katwal, Utsab;Uy, Brian;Wang, Wen-Da |
| 作者单位： | Western Sydney Univ Ctr Infrastruct Engn Penrith NSW 2751 Australia;Univ Sydney Sch Civil Engn Sydney NSW 2006 Australia;Univ Sydney Sch Civil Engn Sydney NSW 2006 Australia;Lanzhou Univ Technol Sch Civil Engn Lanzhou 730050 Peoples R China |
| 关键词： | Concrete-filled steel tubes (CFST);Simplified simulation;Fiber beam element model;Concrete confinement;Local buckling;Size effect |
| 摘要： | In detailed three-dimensional (3D) finite-element modeling, two-dimensional and/or 3D elements are widely used because of their high accuracy and ease of use despite the high computational cost. In contrast, simplified modeling based on fiber beam element (FBE) formulation is preferred for developing macro models to simulate structural frames due to its simplicity and computational efficiency. As for the FBE simulation of concrete-filled steel tubular (CFST) columns, its accuracy largely depends on the input steel and concrete material models, which should implicitly consider the material nonlinearity and interaction between the steel and concrete components. The authors have previously developed a FBE model for circular CFST columns, and this paper is a continuation of the previous work. In this paper, uniaxial effective stress-strain relationships are developed for the steel and concrete materials in rectangular CFST columns based on rigorous analysis of data generated from 3D finite-element modeling of stub columns. Thus, the material models have implicitly considered the effects of yielding and local buckling of the steel tube and passive confinement to the concrete. Meanwhile, the size effect is also considered in the concrete model. The accuracy of the proposed material models is verified against a database of rectangular CFST stub columns covering a wide range of material and geometric parameters. The developed material models are further used to simulate rectangular CFST slender columns and beam-columns, and a reasonably good agreement is achieved between the experimental and predicted load-deformation curves. (C) 2021 American Society of Civil Engineers. |
| 出版年： | 2021 |
| 期刊名称： | Journal of structural engineering |
| 卷： | 147 |
| 期： | 6 |
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