低温区孔隙混凝土细观损伤数值模拟分析

Numerical simulation analysis of mesoscopic damage of pore concrete in low temperature zone

为探究孔隙混凝土在低温条件下孔隙内积留冰对其刚度下降率的影响,通过随机函数投放方法,借助MATLAB软件生成随机孔隙,随后导入ABAQUS中进行数值模拟分析;模型建立采用三因素三水平的正交试验方法,模拟不同参数的孔隙混凝土细观二维模型的破坏过程,最终得到孔径、孔隙率、温度与孔隙混凝土刚度下降率之间的损伤关系.结果表明:在低温区孔隙水冻结成冰的条件下,孔径的大小对孔隙混凝土刚度下降率影响较大,孔隙率对其影响较小,温度的影响力介于二者之间.

The purpose of the study is to investigate the effect of the accumulation of ice in the pores on the rate of decline of the stiffness of the pore concrete under low temperature conditions.Through random function placement method,random pores are generated by MATLAB software,and then imported into ABAQUS for numerical simulation analysis.The model is established by three-factor three-level orthogonal test method to simulate the damage process of pore concrete two-dimensional model with different parameters.Finally,the damage relationship between pore size,porosity,temperature and the rate of decrease of the stiffness of the pore concrete is obtained.The results show that under the condition that the pore water freezes into ice in the low temperature zone,the pore size has a great influence on the stiffness reduction rate of the pore concrete,and the porosity has little influence on it.The influence of temperature is between the two.