考虑界面影响的钢纤维混凝土细观力学等效性能研究-《郑州大学学报(工学版)》

文章信息/Info

Title:: Micromechanics equivalent performance study of steel fiber reinforced concrete with interface layers

Keywords:: Steel fiber reinforced concrete; Interface; Micromechanics; Equivalent modulus of elasticity

摘要:: 钢纤维与混凝土基体之间的界面对钢纤维混凝土(SFRC)发挥其增强、增韧作用具有重大影响,故为了考证其微观结构特征,探讨SFRC微观结构与其宏观性能之间的关系.考虑了在无限各向同性平面内分布的圆形钢纤维,采用超奇异积分方程和复变函数等方法建立纤维、界面和基体上的应力、应变和位移等的分析模型.采用Galerkin积分方法和Gauss-Seidel迭代方法获得在平面应变务件下具有不同体积率和界面层厚度的钢纤维混凝土等效参数,讨论了钢纤维体积率以及界面层厚度对材料等效参数的影响,并通过与相同条件下宏观试验得出的结果相比较,结果表明,本模型能够较为准确地分析钢纤维混凝土的宏观弹性参数.

Abstract:: The interface between steel fiber and concrete matrix has a great influence on the strengthening and toughening effect of steel fiber concrete (SFRC), so in order to investigate its microstructure characteristics, the relationship between SFRC microstructure and its macroscopic properties is discussed. Considering the circular steel fibers distributed in the infinite isotropic plane, the super-singular integral equation and complex function are used to establish the analysis model of stress, strain and displacement on the fiber, interface and matrix. The Galerkin integral method and Gauss-Seidel iterative method were used to obtain the equivalent parameters of steel fiber concrete with different volume rates and interfacial layer thickness under plane strain gauges, and the influence of steel fiber volume rate and interface layer thickness on the equivalent parameters of materials was discussed, and compared with the results obtained by macroscopic experiments under the same conditions, the results show that the model can accurately analyze the macroelastic parameters of steel fiber concrete.