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A STUDY ON FRACTURE-DAMAGE BEHAVIOR OF CONCRETE BASED ON THE MESO-SCALE MODEL

机译：基于细观模型的混凝土断裂损伤行为研究

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摘要

As a multiphase nonhomogeneous material, concrete is widely used in civil engineering. In this paper, a meso-scale mechanical model is proposed to study the deformation and failure process of concrete based on the nonhomogeneity of concrete at the mesoscopic level. First, concrete is taken as a type of three-component composite material composed of mortar matrix, aggregates and interfaces on the meso-scale. A random distribution scheme is used for aggregates deposition. Secondly, based on the continuum damage mechanics, a finite element meso-scale mechanics model for concrete is presented with damage softening stress-strain relationship to describe the mechanical behavior of different components of concrete. Numerical experiments for simulating 3-point bending beam and L-shape beam are accomplished, which show good agreement with the corresponding experimental results. In addition, nonhomogeneities of each component of concrete are considered by assuming the material properties in concrete conform to the Weibull distribution law. The influence of homogeneity index on nonlinear softening behaviors is studied in detail. It is concluded that the model is able to capture the entire process of damage of concrete, including the crack development associated with different loading stages.
机译：混凝土是一种多相非均质材料，广泛用于土木工程。本文提出了一种基于介观水平的混凝土非均质性的细观力学模型来研究混凝土的变形和破坏过程。首先，将混凝土作为一种三组分复合材料，由灰浆基体，骨料和中尺度的界面组成。随机分布方案用于聚集体沉积。其次，基于连续损伤力学，提出了具有损伤软化应力-应变关系的混凝土有限元细观力学模型，描述了混凝土不同成分的力学行为。进行了模拟三点弯曲梁和L形梁的数值实验，与相应的实验结果吻合良好。另外，通过假定混凝土中的材料特性符合威布尔分布定律来考虑混凝土各成分的不均匀性。详细研究了均匀度指数对非线性软化行为的影响。结论是，该模型能够捕获混凝土损坏的整个过程，包括与不同加载阶段相关的裂纹发展。

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  • 会议地点 Nanjing(CN)
  • 作者

    A.Mokhtari Asal; rnSh.Rastegar; rn; rn;

  • 作者单位

    TANG XINWEI@State Key Laboratory of Hydroscience and Hydraulic Engineering,Department of Hydraulic Engineering,Tsinghua University,Beijing 100084,China--ZHANG CHUHAN@State Key Laboratory of Hydroscience and Hydraulic Engineering,Department of Hydraulic Engineering,singhua University,Beijing 100084,China--;

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