骨料含量和试件尺寸对混凝土单轴受压细观性能影响  

Influence of Aggregate Content and Specimen Size on the Meso Performance of Concrete Under Uniaxial Compression

作　　者：翁维素[1,2] 周胜 乔春蕾 刘仲洋 WENG Weisu;ZHOU Sheng;QIAO Chunlei;LIU Zhongyang(Hebei University of Architecture,Hebei University,Zhangjiakou 075000,Hebei,China;Hebei Key Laboratory for Diagnosis,Reconstruction and Anti-Disaster of Civil Engineering,Zhangjiakou 075031,Hebei,China;School of Civil and Transportation Engineering,Hebei University of Technology,Tianjin 300401,China)

机构地区：[1]河北建筑工程学院,河北张家口075000 [2]河北省土木工程诊断、改造与抗灾重点实验室,河北张家口075031 [3]河北工业大学土木与交通学院,天津300401

出　　处：《力学季刊》2024年第3期867-876,共10页Chinese Quarterly of Mechanics

基　　金：河北省高等学校科学技术研究项目(ZC2024057)。

摘　　要：为了研究粗骨料含量对混凝土单轴受压性能及尺寸效应的影响,通过编写Python脚本在Abaqus中建立二维混凝土随机骨料模型.该模型涵盖了骨料、砂浆和界面过渡区三相混凝土细观结构,使得模型更加接近真实混凝土结构;通过设置骨料含量和模型尺寸这两个变量,研究了其对模型力学性能的影响.研究结果表明,在同一试件尺寸下,随着骨料含量的增加,混凝土损伤破坏渐趋严重,弹性模量略有增大,抗压强度呈下降趋势;相同骨料含量下混凝土的尺寸效应明显,随着试件尺寸的增加,细观非均质性增强,导致混凝土抗压强度降低,损伤破坏现象更趋明显.分析尺寸效应对模型的影响规律,为实际情况下缩尺模型的性能预测提供参考.In order to study the influence of coarse aggregate content on the uniaxial compression performance and size effect of concrete,in this paper we establish a two-dimensional concrete random aggregate model in Abaqus by writing Python scripts.The model includes three concrete meso-structures,i.e.,the aggregate,the mortar and the interfacial transition zone,making it closer to the real concrete structure.The influences of aggregate content and model size on the model mechanical properties were studied.The results show that under the same specimen size,with the increase of aggregate content,the damage of concrete becomes more and more serious,the elastic modulus increases slightly,and the compressive strength decreases.The size effect of concrete is obvious under the same aggregate content.With the increase of specimen size,the meso-heterogeneity is enhanced,which leads to the decrease of concrete compressive strength and the increase of damage and failure phenomenon.The influence of size effect on the model is analyzed,which provides reference for the performance prediction of the scale model under actual conditions.

关 键 词：二维细观骨料模型 破坏模式 单轴抗压强度 骨料含量 尺寸效应 

分 类 号：TU528.1[建筑科学—建筑技术科学]