南京航空航天大学学报（英文版）2025，Vol.42Issue(z1)：156-166,11.DOI:10.16356/j.1005-1120.2025.S.014
CAC双轴压缩力学性能的三维细观研究
Mechanical Properties of CAC Under Biaxial Compression:A 3D Mesoscopic Study
摘要
Abstract
Studies on coral aggregate concrete(CAC)mainly focus on uniaxial stress conditions.However,concrete structures often experience complex stress conditions in practical engineering.It is essential to investigate the mechanical behavior and failure mechanisms of CAC under multiaxial stress conditions.This paper employs a 3D mesoscale model that considers the actual size,shape,and spatial distribution of aggregates.The reliability of the model and material parameters is verified through comparison with existing experimental data.Subsequently,the model is used to systematically study the mechanical properties,failure modes,and failure processes of C40 CAC under the biaxial compression.The numerical results are compared with the experimental results of CAC and ordinary portland concrete(OPC).The results indicate that the failure modes of CAC under the biaxial compression are diagonal shear failure.The biaxial compressive strength and elastic modulus of CAC are greater than those under uniaxial stress and exhibit a significant intermediate principal stress effect.The biaxial compressive strength reaches its maximum value when the stress ratio is 0.5,which is consistent with the conclusions for OPC.Finally,failure criteria and strength envelopes for CAC under the biaxial compression are established in order to provide a reference for analyzing the strength characteristics and structural design of CAC.关键词
珊瑚混凝土/双轴压缩/应力比/破坏模式/强度包络线Key words
coral aggregate concrete(CAC)/biaxial compression/stress ratio/failure mode/strength envelope分类
建筑与水利引用本文复制引用
陈旭升,麻海燕,余红发..CAC双轴压缩力学性能的三维细观研究[J].南京航空航天大学学报（英文版）,2025,42(z1):156-166,11.基金项目
This work was supported by the Na-tional Science Foundations of China(Nos.52078250,51878350,11832013,51678304,51508272). （Nos.52078250,51878350,11832013,51678304,51508272）
