不同粉煤灰掺量下SCC单轴压缩试验离散元数值分析

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国家科技期刊平台
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中文摘要：为了研究不同粉煤灰掺量自密实混凝土的力学性能变化及破坏性状,利用PFC2D中的FISH语言及该程序自带的线性黏结模型,建立不同粉煤灰掺量自密实混凝土单轴压缩试验离散元模型,并与实际试验结果进行对比,分析其内部破坏形态与力链变化.研究表明:不同粉煤灰掺量FA-SCC的极限强度呈先增后减的趋势,破坏裂缝均为对角裂缝,区别在于中部竖向裂纹数量不同,建立的二维离散元数值模型可以很好地模拟粉煤灰自密实混凝土结构轴压破坏时材料内部微裂纹产生、裂缝扩展及对角贯通裂缝形成的过程,弥补了室内试验仅仅依靠肉眼观测的不足,同时模型输出的不同粉煤灰掺量自密实混凝土的轴压强度及应力应变曲线与实验室试验结果高度贴合,最大抗压强度误差不超过 7.1%.

外文标题：Numerical Simulation of SCC Uniaxial Compression Test with Different Fly Ash Content Based on Discrete Element Method

外文摘要：In order to study the change of mechanical properties and failure behavior of self-compacting concrete with different fly ash con-tent,the FISH language in PFC2D and the linear bonding model built in the program were used to establish a single self-compacting concrete with different fly ash content.The discrete element model of the axial compression test was compared with the actual test results to analyze the internal failure form and force chain changes.The research shows that the ultimate strength of FA-SCC with different fly ash content increases first and then decreases,and the failure cracks are all diagonal cracks.The difference lies in the number of vertical cracks in the middle.The established two-dimensional discrete element numerical model type can well simulate the uniaxial compression test of fly ash self-compacting concrete structure,and can well observe the process of the generation of micro-cracks in the material,the expansion of cracks and the forma-tion of diagonal penetration cracks when the axial compression failure occurs,which makes up for the indoor test only relying on the naked eye.At the same time,the axial compressive strength and stress-strain curves of the self-compacting concrete output by the model under dif-ferent fly ash content are highly consistent with the laboratory test results,and the error of the maximum compressive strength measured does not exceed 7.1%,which is the result of fly ash.The discrete element simulation and mesostructure research of grey self-compacting concrete provide reference.

外文关键词：

self-compacting concretefly ashuniaxial compressiondiscrete element analysis

作者：

程学磊、王亚佐、刘俊霞、郑锦辉、海然、何鲜峰

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作者单位：

中原工学院建筑工程学院,河南郑州 450007

黄河水利委员会黄河水利科学研究院,河南郑州 450003

关键词：

自密实混凝土粉煤灰单轴压缩离散元分析

基金：

国家自然科学基金资助项目河南省高等学校重点科研项目河南省高等学校重点科研项目河南省自然科学基金面上项目中原工学院青年骨干教师计划资助项目中原工学院基本科研业务费专项资金项目

项目编号：

4187725122A56002123A5600142223004205962020XQG14K2020QN015

出版年：

2024

DOI：

10.3969/j.issn.1000-1379.2024.07.024

人民黄河

水利部黄河水利委员会

人民黄河

CSTPCD北大核心

影响因子：0.494

ISSN：1000-1379

年,卷(期)：2024.46(7)