Fine-scale model of concrete composite for long-term cycling transient loads incorporating nonlinear hardening and softening effects

IF 7.1 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composite Structures Pub Date : 2025-09-17 DOI:10.1016/j.compstruct.2025.119649

Himanshu Rana , Adnan Ibrahimbegovic

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引用次数: 0

Abstract

Concrete modeling under long-term cyclic transient loading has always been a challenging task due to the highly heterogeneous nature of the material. In this context, the present study proposes a fine-scale model of concrete by representing it as a two-phase material composed of aggregates and mortar. For this, the material domain is discretized into Voronoi cells connected by cohesive links using Delaunay triangulation, and an aggregate assignment algorithm is proposed to associate these links to either aggregates or mortar. Following this, the cohesive links representing mortar are modeled as 2D Timoshenko beam elements incorporating a distinct nonlinear kinematic hardening model along with isotropic softening model, separately in tension, compression, and shear. Softening in the material is introduced using the Embedded Discontinuity Finite Element Method (EDFEM) to model localized discontinuities. In contrast, the cohesive links associated with aggregates are modeled as elastic 2D Timoshenko beam elements. Lastly, compressive cyclic and three-point bending tests are performed on the concrete specimen, and the results are compared with experimental data reported in the literature, showing very good agreement with the experiments. Additionally, an active Bayesian Optimization (BO) procedure is performed to determine the optimal set of parameters for the three-point bending test by minimizing the Mean Squared Error (MSE) of energy between the present model and the experimental results.

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考虑非线性硬化和软化效应的混凝土复合材料长期循环瞬态荷载的细尺度模型

由于材料的高度非均质性，长期循环瞬态荷载下的混凝土建模一直是一项具有挑战性的任务。在这种情况下，本研究提出了一个细尺度的混凝土模型，将其表示为由骨料和砂浆组成的两相材料。为此，使用Delaunay三角剖分将材料域离散为由内聚链接连接的Voronoi细胞，并提出了一种聚合分配算法将这些链接关联到聚合体或砂浆。在此之后，代表砂浆的粘性链接被建模为二维Timoshenko梁单元，其中包括不同的非线性运动硬化模型和各向同性软化模型，分别在拉伸，压缩和剪切中。采用嵌入不连续面有限元法（EDFEM）对局部不连续面进行建模，引入了材料的软化现象。相反，与聚集体相关的内聚链接被建模为弹性二维Timoshenko梁单元。最后对混凝土试件进行了压缩循环和三点弯曲试验，并与文献报道的试验数据进行了比较，结果与试验结果吻合较好。此外，采用主动贝叶斯优化（BO）方法，通过最小化模型与实验结果之间的能量均方误差（MSE）来确定三点弯曲试验的最优参数集。

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来源期刊

Composite Structures 工程技术-材料科学：复合

CiteScore

12.00

自引率

12.70%

发文量

1246

审稿时长

78 days

期刊介绍： The past few decades have seen outstanding advances in the use of composite materials in structural applications. There can be little doubt that, within engineering circles, composites have revolutionised traditional design concepts and made possible an unparalleled range of new and exciting possibilities as viable materials for construction. Composite Structures, an International Journal, disseminates knowledge between users, manufacturers, designers and researchers involved in structures or structural components manufactured using composite materials. The journal publishes papers which contribute to knowledge in the use of composite materials in engineering structures. Papers deal with design, research and development studies, experimental investigations, theoretical analysis and fabrication techniques relevant to the application of composites in load-bearing components for assemblies, ranging from individual components such as plates and shells to complete composite structures.