李冬, 韩丛熹, 金浏, 杜修力. 一种基于绕晶失效模式的混凝土断裂分析模型[J]. 工程力学. DOI: 10.6052/j.issn.1000-4750.2022.04.0383
引用本文: 李冬, 韩丛熹, 金浏, 杜修力. 一种基于绕晶失效模式的混凝土断裂分析模型[J]. 工程力学. DOI: 10.6052/j.issn.1000-4750.2022.04.0383
LI Dong, HAN Cong-xi, JIN Liu, DU Xiu-li. AN INTERGRANULAR FAILURE MODE-BASED FRACTURE ANALYSIS MODEL OF CONCRETE[J]. Engineering Mechanics. DOI: 10.6052/j.issn.1000-4750.2022.04.0383
Citation: LI Dong, HAN Cong-xi, JIN Liu, DU Xiu-li. AN INTERGRANULAR FAILURE MODE-BASED FRACTURE ANALYSIS MODEL OF CONCRETE[J]. Engineering Mechanics. DOI: 10.6052/j.issn.1000-4750.2022.04.0383

一种基于绕晶失效模式的混凝土断裂分析模型

AN INTERGRANULAR FAILURE MODE-BASED FRACTURE ANALYSIS MODEL OF CONCRETE

  • 摘要: 基于普通强度混凝土发生I-型开裂后的形态学特征,充分考虑其材料组成的非均质性及细观尺度绕晶失效模式,建立了用于混凝土断裂破坏行为及其宏观力学性能研究的三维细观断裂理论分析模型。模型采用细观力学基本理论框架,假设混凝土材料由骨料、砂浆和界面构成。为简化理论推导,采用弹性球体代表骨料,采用典型双线性弹性本构模型表征砂浆和界面的力学行为。建立的理论分析模型能够描述普通强度混凝土在唯一裂缝面假定下的断裂面形态学特征,并定量给出宏观尺度断裂参数。该文工作可为后续建立基于穿晶失效模式的混凝土断裂分析模型提供研究框架,为最终建立基于性能的混凝土材料配合比设计理论奠定基础。

     

    Abstract: Upon the morphological characteristics of ordinary strength concrete under mode-I fracture, a three-dimensional meso-fracture theoretical analysis model was established by considering the heterogeneity of its material composition and the intergranular failure mode at the mesoscale, for the study of concrete fracture failure behavior and its macroscopic mechanical properties. The model adopts the basic theoretical framework of meso-mechanics, assuming that the concrete material is composed of aggregate, mortar, and interface. In order to simplify the theoretical derivation, elastic sphere was used to represent aggregate, and typical bilinear elastic constitutive model was used to characterize the mechanical behavior of mortar and interface. The established theoretical analysis model can describe the morphological characteristics of the fracture surface of ordinary strength concrete under the assumption of unique fracture surface and give the macroscopic fracture parameters quantitatively. The work presented can provide a research framework for the subsequent establishment of concrete fracture analysis model upon the transgranular failure mode and, lay a foundation for the final establishment of performance-based concrete material mix design theory.

     

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