Combined with the heterogeneity of concrete, a three-dimensional meso-numerical calculation model of concrete under freeze-thaw was established. Moreover, the material development of concrete was carried out by using the VUSDFLD user subroutine of ABAQUS to achieve the simulation of cracking characteristics on concrete. A calculation model for cracking of concrete under freeze-thaw was established. The model can be used to study the mechanical properties of concrete under freeze-thaw. By comparing the calculation results and test results of relative dynamic elastic modulus of concrete under freeze-thaw, the effectiveness of the calculation method was verified. On this basis, the mechanical properties of concrete with different aggregate diameter after freeze-thaw were analyzed. The influence of aggregate diameter on frost resistance of concrete were obtained. The results show that the meso-numerical simulation method can effectively reflect the mechanical properties of freeze-thaw concrete. This method was used to analyze the mesoscopic characteristics of 25 groups concrete under freeze-thaw. The calculation results verify the applicability of the method to freeze-thaw concrete. The simulation model can effectively describe the stress-strain evolution behavior of freeze-thaw concrete. The maximum aggregate diameter has little influence on the frost resistance of concrete.

结合混凝土的非均质性，建立了冻融混凝土的三维细观数值计算模型。此外，通过使用ABAQUS的VUSDFLD用户子例程进行了混凝土的材料开发，以实现对混凝土开裂特性的模拟。建立了冻融混凝土开裂的计算模型。该模型可用于研究冻融条件下混凝土的力学性能。通过比较冻融条件下混凝土相对动弹性模量的计算结果和试验结果，验证了该计算方法的有效性。在此基础上，分析了冻融后不同骨料直径的混凝土的力学性能。得到骨料直径对混凝土抗冻性的影响。结果表明，细观数值模拟方法可以有效地反映冻融混凝土的力学性能。用该方法分析了25组混凝土的冻融介观特性。计算结果验证了该方法对冻融混凝土的适用性。仿真模型可以有效地描述冻融混凝土的应力-应变演化行为。最大骨料直径对混凝土的抗冻性影响很小。计算结果验证了该方法对冻融混凝土的适用性。仿真模型可以有效地描述冻融混凝土的应力-应变演化行为。最大骨料直径对混凝土的抗冻性影响很小。计算结果验证了该方法对冻融混凝土的适用性。仿真模型可以有效地描述冻融混凝土的应力-应变演化行为。最大骨料直径对混凝土的抗冻性影响很小。