水利学报2018，Vol.49Issue(4)：464-473,10.DOI:10.13243/j.cnki.slxb.20171162
考虑材料层次尺寸效应影响的混凝土力学性能理论预测方法
A theoretical method to predict the mechanical properties of concrete considering of the size effect in material
摘要
Abstract
The particle size of coarse aggregates in dam concrete ranges from 5mm to 150mm,consequently,the macroscopic mechanical properties of concrete are easily varied with the aggregate gradation.From the mesoscopic of view,a theoretical method to predict the mechanical properties of concrete considering of the size effect in material is established.In view of the internal structures,the concrete material is regarded as a three-phase composite composed by the coarse aggregate,the mortar matrix and the interfacial transition zone (ITZ).It is assumed that the aggregate is unbroken within the process of loading.The mechanical behavior of the mortar matrix and the ITZ is described by bilinear constitutive models.Based on the theoretical concept of fracture mechanics,a group of theoretical formulae for the determination of mechanical parameters of concrete including the mesoscopic crack length,the macroscopic fracture energy,the uniaxial tensile strength,the characteristic length and the brittleness number are derived.The influences of the mechanical properties of the ITZ and the aggregate gradation/volume on the macroscopic mechanical properties of concrete are analyzed based on the proposed theoretical method.关键词
大坝混凝土/尺寸效应/断裂力学/细观力学/骨料级配/界面过渡区Key words
dam concrete/size effect/fracture mechanics/mesomechanics/aggregate gradation/interfacial transition zone分类
建筑与水利引用本文复制引用
李冬,金浏,杜修力,刘晶波..考虑材料层次尺寸效应影响的混凝土力学性能理论预测方法[J].水利学报,2018,49(4):464-473,10.基金项目
国家自然科学基金青年科学基金项目(51708007) （51708007）
中国博士后科学基金面上项目(2017M620788) （2017M620788）
国家重点研发计划专项(2016YFC0701100) （2016YFC0701100）
