二级配骨料随机分布混凝土动态特性数值模拟

混凝土是民用、工业、安全防护等建筑中最常用的材料之一,具有抗压强度高、工艺简单、抗腐蚀性好、抗耐性优良等特点。在使用过程中,不仅要承受准静态荷载作用,还需考虑爆炸、冲击等动载荷的作用,因此有必要进行混凝土动态特性研究。利用ANSYS/LS-DYNA软件,对粗骨料粒径和体积含量不同二级配混凝土动态特性进行模拟,分析粗骨料粒径和体积含量对二级配混凝土动态特性影响规律。研究表明:随着粗骨料最大粒径的增加,二级配混凝土峰值应力呈下降趋势;随着粗骨料中间粒径和体积含量增大,二级配混凝土峰值应力均呈现先增大后减少趋势。

Numerical Simulation of Dynamic Mechanical Properties of Two-gradation Concrete with Random Distribution of Coarse Aggregate

Concrete is widely used in civil, industrial and safety defense buildings, which has high compressive strength, simple preparation, better corrosion and tolerance resistance. Concrete is not only used to be sustained with quasi-static loading, but also subjected to impact and explosion loading. It is necessary to study on the dynamic mechanical properties of concrete. Finite element software ANSYS/LS-DYNA was used to simulate the dynamic failure process of two-gradation concrete with various sizes and volume content of coarse aggregate. Simulated results shows that the peak stress of two-gradation concrete subjected to impact loading declines with the maximum size of coarse aggregate. With the increase of middle size and volume content of coarse aggregate, the peak stress of two-gradation concrete increase firstly, and then declines.