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首页> 外文期刊>Engineering Structures >A flexure-shear Timoshenko fiber beam element based on softened damage-plasticity model
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A flexure-shear Timoshenko fiber beam element based on softened damage-plasticity model

机译：基于软化损伤-塑性模型的挠曲剪切季莫申科纤维梁单元

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摘要

In this paper, a displacement-based fiber beam element including flexure-shear interaction is developed. The element is based on the conventional Timoshenko beam theory, and the section behavior is modeled with the well-known fiber section approach, where the section is divided into steel fibers and concrete fibers. The Menegotto-Pinto model is used for steel fibers and a multi-dimensional softened damage-plasticity model, which accounts for the compression-softening effect of reinforced concrete, is adopted for concrete fibers. The axial-flexure-shear interaction can be well reflected in both section level and material level since the normal-shear coupling is reflected naturally in the multi-dimensional material constitutive law. Besides, the concrete material parameters are related to fracture energy to avoid mesh-sensitivity issue of softening problems. The numerical implementation of the proposed element, including the finite element approximation and fiber state determination, is also discussed in detail. The element is validated through the test results for a series of simply supported reinforced concrete beams under monotonic loading and reinforced concrete columns and wall under cyclic loading, and the results indicate that the element is capable to reproduce the shear behaviors of reinforced concrete members under different loading cases. (C) 2017 Elsevier Ltd. All rights reserved.
机译：在本文中，开发了一种基于位移的包括弯曲-剪切相互作用的纤维梁单元。该单元基于常规的Timoshenko梁理论，并且使用众所周知的纤维截面方法对截面行为进行建模，其中截面分为钢纤维和混凝土纤维。 Menegotto-Pinto模型用于钢纤维，而多维纤维化的损伤-可塑性模型则考虑了钢筋混凝土的压缩软化效果，而对混凝土纤维则采用这种模型。轴向-弯曲-剪切相互作用可以很好地反映在截面水平和材料水平上，因为法向剪切耦合自然反映在多维材料本构关系中。此外，混凝土材料参数与断裂能有关，以避免软化问题引起的网格敏感性问题。还详细讨论了所提出元素的数值实现，包括有限元逼近和纤维状态确定。通过单调荷载作用下一系列简支钢筋混凝土梁，循环荷载作用下钢筋混凝土柱和墙的试验结果验证了该单元，结果表明该单元能够再现不同条件下钢筋混凝土构件的剪切性能。装箱。 （C）2017 Elsevier Ltd.保留所有权利。

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  • 来源
    《Engineering Structures》 |2017年第1期|483-497|共15页
  • 作者

    Feng De-Cheng; Wu Gang; Sun Ze-Yang; Xu Ji-Gang;

  • 作者单位

    Southeast Univ, Minist Educ, Key Lab Concrete & Prestressed Concrete Struct, Nanjing 210096, Jiangsu, Peoples R China;

    Southeast Univ, Minist Educ, Key Lab Concrete & Prestressed Concrete Struct, Nanjing 210096, Jiangsu, Peoples R China;

    Southeast Univ, Minist Educ, Key Lab Concrete & Prestressed Concrete Struct, Nanjing 210096, Jiangsu, Peoples R China;

    Southeast Univ, Minist Educ, Key Lab Concrete & Prestressed Concrete Struct, Nanjing 210096, Jiangsu, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Fiber element; Flexure-shear interaction; Timoshenko beam; Damage-plasticity model; Compression-softening; Mesh-objectivity;

    机译：纤维单元;弯曲-剪切相互作用;Timoshenko梁;损伤-可塑性模型;压缩软化;网格物体;

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