基于细观层次橡胶混凝土单轴受压力学分析

Mechanical Analysis of Rubberized Concrete Subjected to Uniaxial Compression on Meso-level

基于随机骨料模型,从细观上对处于轴向荷载作用下的橡胶混凝土进行了二维及三维细观力学分析.利用瓦拉文公式和富勒公式分别计算出二维及三维情况下的橡胶混凝土细观骨料数,把橡胶混凝土各相分别划分为二维四节点四边形单元和三维四面体单元,分别给细观各相赋予相应的材料属性并建立有限元计算模型.计算结果表明:在二维情况下,该模型的计算速度快,得出的应力、应变与试验吻合较好,而三维计算模型模拟的破坏形态与试验结果比较一致.

Based on random aggregate model and the method of meso-level mechanics, performances of rubberized concrete specimen subjected to uniaxial compression were analyzed by two and three dimension models separately. The number of random aggregates was calculated by two and three dimensional meth- ods in Walraven formula and Fuller formula respectively. A four-node quadrilateral element in two dimen- sions and a four-node tetrahedron element in three dimensions were used respectively to mesh the specimen, and the 2D and 3D finite element models were then established by these methods. The calculation results show that the two dimensional model had fast convergence rate and its solution is in good agreement with the test results. The failure pattern of calculation result of three dimensional model is consistent well with the experimental result.