东南大学学报（自然科学版）2025，Vol.55Issue(5)：1236-1245,10.DOI:10.3969/j.issn.1001-0505.2025.05.003
循环压缩作用下高强高韧混凝土的力学性能与损伤演化模型研究
Mechanical properties and damage evolution modelling of HS-UHTCC under cyclic compression
摘要
Abstract
The mechanical behavior of high-strength ultra-high toughness cementitious composites(HS-UHTCC)under monotonic and cyclic uniaxial compression was analyzed in this study.X-ray computed to-mography(X-CT)imaging technology was used to reveal internal damage processes,while scanning electron microscopy(SEM)was used to elucidate fiber reinforcement mechanisms.Results indicate that the HS-UHTCC's envelope of cyclic stress-strain curves closely matches the monotonic compression curve.Compared with ultra-high performance concrete,HS-UHTCC shows gentler stiffness degradation and delayed damage evolution.X-CT images demonstrate accelerated crack propagation post-peak,reflecting rapid damage evolu-tion.Steel fibers exhibit pull-out failure under both monotonic and cyclic compression,while polyethylene fi-bers display distinct failure modes.Systematic analysis reveals evolution patterns of plastic strain and stiffness deg-radation,establishing relationships between damage factors and strain.The proposed elastoplastic damage con-stitutive equation effectively describes HS-UHTCC's stress-strain behavior and damage evolution under uniaxial compression,providing theoretical support for the structural design and engineering application of HS-UHTCC.关键词
高强高韧混凝土/循环压缩/应力-应变关系/损伤演化Key words
high strength ultra-high toughness cementitious composites/cyclic compression/stress-strain relationship/damage evolution分类
建筑与水利引用本文复制引用
李庆华,刘雪涵,银星,徐世烺..循环压缩作用下高强高韧混凝土的力学性能与损伤演化模型研究[J].东南大学学报（自然科学版）,2025,55(5):1236-1245,10.基金项目
国家自然科学基金资助项目(52225803,52338003) （52225803,52338003）
中国博士后创新人才支持计划资助项目(BX20240320). （BX20240320）
