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首页> 外文学位 >Caracterisation et modelisation du comportement non lineaire d'elements en beton arme et non arme sous sollicitations multiaxiales.
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Caracterisation et modelisation du comportement non lineaire d'elements en beton arme et non arme sous sollicitations multiaxiales.

机译：钢筋混凝土和非钢筋混凝土构件在多轴应力下的非线性特性表征和建模。

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摘要

This study presents the development of a hypoelastic three-dimensional model for the static analysis of reinforced and unreinforced concrete structures. The main concrete nonlinear behaviour characteristics are discussed along with a detailed analysis of the damage mechanisms of concrete up to rupture. Triaxial compression tests were carried out in this research to study, in particular, the effect of confinement on the damage progression and on the nature of the failure.;The main characteristics of the nonlinear behaviour of concrete, its triaxial behaviour, the steel-concrete interaction and the post-peak response, have been studied theoretically and numerically. New constitutive equations have been proposed: the cumulative damage of concrete along nonproportional loading paths is quantified with a scalar parameter; the volumetric expansion is considered through the use of non-symmetrical Poisson's coefficients; a simple equation for classifying the various modes of rupture is also proposed. Finally the post-peak behaviour of concrete is modelled using the principle of equivalent energy such that results are independent of the mesh size.;The proposed constitutive model has been validated under various stress conditions and histories and has always given satisfactory results, especially for non- proportional loading. Various types of reinforced concrete elements were modelled successfully: reinforced and unreinforced concrete members under uniaxial tension, reinforced concrete beams in shear, deep beams, reinforced concrete panels in biaxial state of stress, slabs exhibiting punching shear failure around columns, and laterally confined columns.
机译：这项研究提出了用于增强和不增强混凝土结构静力分析的次弹性三维模型的开发。讨论了混凝土的主要非线性行为特征，并详细分析了直至破裂的混凝土破坏机理。本研究进行了三轴压缩试验，特别是研究了约束对破坏进程和破坏性质的影响。；混凝土非线性行为的主要特征，其三轴行为，钢筋混凝土相互作用和峰后响应，已在理论和数值上进行了研究。提出了新的本构方程：用标量参数量化混凝土沿非比例加载路径的累积损伤；通过使用非对称泊松系数来考虑体积膨胀；还提出了一个简单的方程，用于对各种断裂模式进行分类。最后，使用等效能量原理对混凝土的峰后行为进行建模，从而使结果与网格尺寸无关。所提出的本构模型已经在各种应力​​条件和历史上得到了验证，并且始终给出令人满意的结果，尤其是对于非应力状态。 -比例加载。成功地对各种类型的钢筋混凝土构件进行了建模：单轴张力下的钢筋混凝土构件和非钢筋混凝土构件，处于剪切状态的钢筋混凝土梁，深梁，处于双轴应力状态的钢筋混凝土面板，在柱子周围表现出冲剪破坏的平板以及侧向约束柱。

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  • 作者

    Bouzaiene, Abdel Hafidh.;

  • 作者单位

    Ecole Polytechnique, Montreal (Canada).;

  • 授予单位 Ecole Polytechnique, Montreal (Canada).;
  • 学科 Applied Mechanics.;Engineering Mechanical.;Engineering Civil.
  • 学位 Ph.D.
  • 年度 1995
  • 页码 311 p.
  • 总页数 311
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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