摘要
为了研究纤维增强高性能混凝土的三轴抗压破坏准则,对3种不同钢纤维掺量的纤维增强高性能混凝土进行了4种围压下的常规三轴试验,获得了纤维增强高性能混凝土的三轴偏应力-应变曲线。结果表明,掺入钢纤维和施加围压均能对纤维增强高性能混凝土起到增强、增韧的作用,随着钢纤维掺量和围压的增加,纤维增强高性能混凝土的轴向偏应力、应变、弹性模量均增大。但是二者的作用会相互影响:围压增大,钢纤维掺量对纤维增强高性能混凝土轴向偏应力提高的幅度降低;钢纤维掺量增大时,围压对纤维增强高性能混凝土的增强作用会降低。利用Mohr-Coulomb破坏准则、William-Warnke破坏准则和Power-Law破坏准则构建了不同钢纤维掺量的高性能混凝土三轴抗压破坏模型,研究表明,基于上述3种破坏准则均能较好地模拟高性能混凝土的三轴破坏过程,通过分析模型拟合系数R^(2)发现,William-Warnke模型模拟精度最高,而Power-Law模型能够很好地模拟出钢纤维掺量对高性能混凝土的三轴抗压强度的影响。
The triaxial compressive behavior of steel fiber reinforced high performance concrete containing three different contents of steel fiber is studied.Normal triaxial compression tests with four different confining pressure levels are performed with the cylindrical specimens.The additional stress-strain curves of steel fiber reinforced high performance concrete are obtained.Test results show that the additional stress,strain and elastic modulus increases with the increasing of steel fiber and the confining pressure level,as adding steel fiber and applying confining pressure can strengthen and toughen the concrete.However,the strengthening and toughening effect can be affected by each other.When the confining pressure level increases,the strengthening effect of steel fiber reduces,and when the steel fiber content increases,the strengthening effect of confining pressure decreases.Finally,three failure criterion,Mohr-Coulomb,William-Warnke and Power-Law failure criterion are used to simulate the failure of steel fiber reinforced high performance concrete.In the above three models,the determination coefficient R2 of William-Warnke model is highest.The Power-Law model can reflect the influence of fiber content on the triaxial compressive behavior.
作者
卜静武
吴新宇
徐慧颖
BU Jingwu;WU Xinyu;XU Huiying(School of Hydraulic Science and Engineering,Yangzhou University,Yangzhou 225009,China)
出处
《华北水利水电大学学报（自然科学版）》
北大核心
2023年第1期71-78,共8页
Journal of North China University of Water Resources and Electric Power：Natural Science Edition
基金
国家自然科学基金项目(51809227)。
关键词
纤维增强高性能混凝土
三轴试验
围压
钢纤维掺量
破坏准则
fiber reinforced high performance concrete
triaxial compressive test
confining pressure
steel fiber content
failure criterion.
