重庆大学学报2026，Vol.49Issue(3)：107-122,16.DOI:10.11835/j.issn.1000-582X.2025.038
三维动静组合加载下混凝土动态力学特性及模拟研究
Dynamic mechanical behavior and numerical simulation of concrete under three-dimensional coupled static-dynamic loading
摘要
Abstract
To study the dynamic mechanical behavior of concrete under three-dimensional coupled static-dynamic loading,split Hopkinson pressure bar(SHPB)experiments were carried out under combined axial compression,confining pressure,and impact loading.A stress initialization method was introduced into the LS-DYNA program,and a sequential analysis approach consisting of implicit static loading followed by explicit transient dynamic loading was used to simulate the coupled static-dynamic loading process.The influence of different static load combinations on the strength and failure characteristics of concrete was systematically analyzed.The results show that,at the same impact velocity,the dynamic compressive strength of concrete increases with increasing confining pressure,which provides a protective effect on the specimen.A critical axial compression value is observed:below this threshold,axial compression enhances specimen strength,whereas beyond it,axial compression leads to strength deterioration.The introduction of the stress initialization method enables accurate realization of constant pre-stress conditions before dynamic analysis.Comparative analysis between experimental and numerical results shows that static loading provides limited compaction enhancement,while changes in static load combination significantly alter the internal stress distribution,which is the main factor affecting the dynamic strength of concrete.Numerical simulations effectively capture the failure process of concrete under three-dimensional coupled static-dynamic loading,revealing that the dominant failure mode is compressive-shear failure.Furthermore,the damage evolution of concrete can be reliably predicted by analyzing the time-history curves of damage variables in the numerical model.关键词
动静组合加载/应力初始化/混凝土/数值模拟/损伤变量Key words
coupled static-dynamic loading/stress initialization/concrete/numerical simulation/damage variable分类
建筑与水利引用本文复制引用
陈信作,蔡勇智,梁霁兴,刘磊,徐泽辉..三维动静组合加载下混凝土动态力学特性及模拟研究[J].重庆大学学报,2026,49(3):107-122,16.基金项目
云南省"兴滇英才支持计划"(KKXX202521089) （KKXX202521089）
云南省重大科技专项(202202AG050014).Supported by Yunnan Province's"Xingdian Talent Support Program"(KKXX202521089),and Yunnan Province's Major Science and Technology Special Project(202202AG050014). （202202AG050014）
