基于统计损伤理论的混凝土双轴拉-压本构模型研究

发布时间：2018-04-20 19:55

本文选题：混凝土 + 双轴拉压　；参考：《应用基础与工程科学学报》2015年05期

【摘要】：基于细观统计损伤理论及宏观试验现象,本文建立了混凝土双轴拉-压细观统计损伤本构模型.该模型考虑断裂、屈服两种细观拉损伤模式,损伤演化过程由主方向的拉、压应变驱动.将单轴拉伸、单轴压缩作为两种最基本的宏观破坏形式,复杂应力状态下的损伤破坏过程理解为单轴拉伸、压缩损伤演化过程的某种组合形式.引入等效传递拉损伤应变和损伤影响参数,建立宏观拉、压破坏模式对应细观损伤机制之间的等效关系.通过与试验结果比较,表明该模型能够很好地模拟双轴拉-压加载情况下材料均匀损伤阶段的力学行为.对双轴拉-压比例加载路径下应力-应变曲线进行预测,提取出双轴拉压强度包络线,从双轴强度、变形特性、破坏形态等角度对材料的双轴拉-压损伤机制进行探讨.
[Abstract]:Based on the meso-statistical damage theory and macroscopic experimental phenomena, a biaxial tension-compression meso-statistical damage constitutive model of concrete is established in this paper. The model considers fracture and yields two kinds of meso-tensile damage modes. The damage evolution process is driven by tensile and compressive strain in the main direction. Uniaxial tension and uniaxial compression are regarded as two basic macroscopic failure forms. The damage failure process under complex stress is interpreted as a combination of uniaxial tension and compression damage evolution. By introducing the equivalent transfer tensile strain and damage effect parameters, the equivalent relationship between macroscopic tensile and compressive failure modes corresponding to meso-damage mechanism is established. By comparing with the experimental results, it is shown that the model can well simulate the mechanical behavior of the uniform damage stage of the material under biaxial tension and compression loading. The stress-strain curve under the biaxial tension compression loading path is predicted and the biaxial tensile compression strength envelope is extracted. The biaxial tension-compression damage mechanism of the material is discussed from the aspects of biaxial strength, deformation characteristics and failure morphology.
【作者单位】：华北水利水电大学水利学院;大连理工大学海岸和近海工程国家重点实验室;聊城大学建筑工程学院;
【基金】：国家自然科学基金青年基金项目(51009020,51209094,51408223,51309101) 大连理工大学海岸和近海工程国家重点实验室开放基金资助项目(LP1401) 水利部公益性行业科研专项经费项目(201301025)
【分类号】：TU37

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