南京航空航天大学学报（英文版）2020，Vol.37Issue(1)：27-39,13.
低应变率下最大骨料粒径对混凝土动态尺寸效应影响:细观模拟
Influence of Maximum Aggregate Size on Dynamic Size Effect of Concrete Under Low Strain Rates:Meso-scale Simulations
摘要
Abstract
This study is to explore the influence of maximum aggregate size(MAS)on the failure and corresponding size effect of concrete materials under low strain rates. The failure process of concrete was simulated by the meso-scale numerical method considering the internal heterogeneity of concrete and strain rate effect. Based on the meso-scale method,the failure behavior of concrete specimens with different structural sizes and MAS was investigated. Also,the influence of MAS on the failure modes,nominal strength and corresponding size effect of concrete were studied at the meso-scale. The simulation results indicated that MAS has an obvious influence on the failure modes of concrete subjected to axial compressive and tensile loads. The nominal tensile strength increased as the MAS increased,while the nominal compressive strength increased first and then decreased as the MAS increases under quasi-static load. In addition,it was found that the size effect on nominal strength of concrete would be weakened with the increase of strain rate. When the applied strain rate reached 1 s-1,the size effect on nominal strength of concrete disappeard. Moreover,the MAS has an ignorable influence on the dynamic size effect of concrete under uniaxial compression and tension.关键词
混凝土/最大骨料粒径/尺寸效应/动态压缩/动态拉伸/应变率Key words
concrete/maximum aggregate size/size effect/dynamic compression/dynamic tension/strain rate分类
建筑与水利引用本文复制引用
金浏,杨旺贤,余文轩,杜修力..低应变率下最大骨料粒径对混凝土动态尺寸效应影响:细观模拟[J].南京航空航天大学学报（英文版）,2020,37(1):27-39,13.基金项目
This work was supported by the Na-tional Key Basic Research and Development Program of Chi-na (No. 2018YFC1504302) and the National Natural Sci-ence Foundation of China(Nos. 51822801,51421005). （No. 2018YFC1504302）
