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首页> 外文期刊>Journal of structural engineering >Simplified Nonlinear Simulation of Rectangular Concrete-Filled Steel Tubular Columns
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Simplified Nonlinear Simulation of Rectangular Concrete-Filled Steel Tubular Columns

机译：简化矩形混凝土钢管柱的非线性模拟

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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.
机译：在详细的三维（3D）有限元建模中，尽管计算成本高，但是由于它们的高精度和易用性，因此广泛使用二维和/或3D元件。相反，基于光纤梁元件（FBE）配方的简化建模是优选的，用于显影宏型模型，以模拟结构帧，由于其简单性和计算效率。至于混凝土钢管（CFST）柱的FBE仿真，其精度主要取决于输入钢和混凝土材料模型，这应该隐含地考虑钢和混凝土部件之间的材料非线性和相互作用。作者以前为循环CFST列开发了FBE模型，本文是前一项工作的延续。本文在矩形CFST柱中为钢和混凝土材料开发了单轴有效的应力 - 应变关系，基于严格分析从短柱的3D有限元建模产生的数据分析。因此，材料模型隐含地认为钢管和局部屈曲与混凝土的被动限制的屈服和局部屈曲的效果。同时，在混凝土模型中也考虑尺寸效应。建议的材料模型的准确性验证了覆盖各种材料和几何参数的矩形CFST短柱数据库。开发的材料模型还用于模拟矩形CFST细长柱和光束柱，并且在实验和预测的负载变形曲线之间实现了合理的协议。 （c）2021年美国土木工程师协会。

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