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提出了三维随机凹凸型碎石骨料生成方法,利用ANSYS/LS-DYNA有限元软件进行数值骨料投放模拟,得到了混凝土三维随机凹凸型碎石骨料几何模型。采用“基本单元模型”在投放区域生成立方体网格单元,结合新的空间点与随机多面体空间相对位置判定方法,判定出各单元材料属性,最后生成混凝土三维随机凹凸型碎石骨料有限元模型。以上混凝土细观有限元模型生成方法较好地控制了骨料粒径、数量和级配,生成的数值模型中骨料体积率在55%左右,处于真实混凝土骨料体积率的范围中。生成的数值骨料与真实碎石骨料形状接近。提出的细观混凝土有限元模型为对混凝土力学性能进行细观数值研究奠定了基础。
A three-dimensional random bump-gravel aggregate production method is proposed. The numerical simulation of the aggregate is carried out by using ANSYS / LS-DYNA finite element software. The geometric model of three-dimensional random bump aggregate aggregate is obtained. The cube element is generated in the placement area by using the “basic unit model”. Based on the method of determining the relative position between the new point and the random polyhedron, the material properties of each element are determined. Finally, the three-dimensional random concave- Metamodel. The above concrete mesostructure finite element model generation method can well control the aggregate size, quantity and gradation. The generated volumetric model volume ratio is about 55%, which is in the range of real concrete aggregate volume fraction. The resulting numerical aggregate is close to the true aggregate shape. The proposed finite element model of the mesostructured concrete laid the foundation for the numerical study of the mechanical properties of the concrete.