东南大学学报（自然科学版）2025，Vol.55Issue(6)：1530-1540,11.DOI:10.3969/j.issn.1001-0505.2025.06.005
三轴压缩下钢纤维混凝土非正交弹塑性本构模型研究
Study on non-orthogonal elastic-plastic constitutive model of steel fiber reinforced concrete under triaxial compression
摘要
Abstract
Steel fiber reinforced concrete(SFRC)exhibits significant nonlinear behaviors under triaxial com-pression,including hardening,softening,and dilation.To accurately describe its complex mechanical proper-ties,this study develops a plasticity constitutive model for SFRC under triaxial compression based on elasto-plastic theory and the non-associated flow rule.The model accounts for steel fiber content by modifying the co-hesive hardening function,yield criterion,and dilation behavior,capturing the enhanced load-bearing and crack resistance provided by the fibers.To optimize numerical implementation of the elastoplastic constitutive model,an inexact line search method and nonlocal approach are used to improve accuracy and efficiency in fi-nite element solutions under complex stress states.The results show that the model can accurately predict stress-strain and volumetric deformation characteristics of SFRC under triaxial compression,offering valuable insights for material optimization and engineering design.关键词
钢纤维混凝土/三轴压缩/非正交流动法则/钢纤维掺量/剪胀特性Key words
steel fiber reinforced concrete/triaxial compression/non-orthogonal flow rule/steel fiber con-tent/dilatancy分类
建筑与水利引用本文复制引用
卿龙邦,杜梦超..三轴压缩下钢纤维混凝土非正交弹塑性本构模型研究[J].东南大学学报（自然科学版）,2025,55(6):1530-1540,11.基金项目
国家自然科学基金资助项目(52425803). （52425803）
