CAJ | 학술논문

为了在细观层次上对全级配混凝土进行数值模拟，进而从机理上认识其力学性能和宏观试验现象。针对随机分布的含有大量椭球形骨料的全级配混凝土给出了一种计算机模拟方法。结合MATLAB语言和COMSOL脚本编程实现了全级配混凝土三维细观几何模型和有限元模型的自动生成。提出了以三维数组划分投放区域和以代数条件为嵌入判别准则，有效地克服了椭球形随机骨料模型生成中的效率瓶颈问题。最后用实例说明算法的有效性。分析表明随机骨料投放含量能达到54%左右，能满足实际混凝土试件数值仿真的要求。
위료재세관층차상대전급배혼응토진행수치모의，진이종궤리상인식기역학성능화굉관시험현상。침대수궤분포적함유대량타구형골료적전급배혼응토급출료일충계산궤모의방법。결합MATLAB어언화COMSOL각본편정실현료전급배혼응토삼유세관궤하모형화유한원모형적자동생성。제출료이삼유수조화분투방구역화이대수조건위감입판별준칙，유효지극복료타구형수궤골료모형생성중적효솔병경문제。최후용실례설명산법적유효성。분석표명수궤골료투방함량능체도54%좌우，능만족실제혼응토시건수치방진적요구。
An approach to generating three-dimensional geometrical models for concrete containing large amounts of ellipsoidal aggre gates is presented taking the random structure of aggregates at the mesoscopic level into consideration.The geometrical models for fully-grad-ed concrete and the finite element models were automatically generated by coupling the commercial software COMSOL with MATLAB. The proposed methodology included determination of the random location of an aggregate particle using a three-dimensional array and an algebraic condition as the embedding criterion in placing process.Numerical experiments were provided to demonstrate the effectiveness and robustness of the new algorithm.The analyses showed that a mesoscopic model with aggregate volume fraction of about 54%can be readily generated and the process of placing aggregates meet the requirement of the numerical simulation for concrete specimens.