【摘要】 将混凝土视为骨料、界面过渡区（ITZ）和基体的三相非均质材料。利用Python语言对Abaqus进行二次开发，基于蒙特卡洛方法生成了混凝土随机凹凸骨料，并通过梁自由振动衰减的试验结果验证了这一模型的有效性。考虑骨料粒径、ITZ厚度、ITZ弹性模量和砂浆弹性模量等因素，根据细观数值模拟的结果讨论了它们对混凝土阻尼性能的影响。结果表明，ITZ含量降低或厚度减小增大均会导致试件阻尼比的下降；ITZ或砂浆弹性模量降低也会导致相同的结果，但ITZ弹性模量的影响更加显著。更多还原

【Abstract】 Considering concrete as a three-phase heterogeneous material consisting of aggregates,interfacial transition zone(ITZ),and matrix.The second development of Abaqus was carried out using Python,and the random shape aggregates of concrete was generated based on Monte Carlo method.The effectiveness of this model was verified by the test results of free vibration attenuation of beams.Taking factors such as aggregate particle size,ITZ thickness,ITZ elastic modulus,and mortar elastic modulus into account,the influence of these factors on the damping performance of concrete was discussed based on the results of microscopic numerical simulations.The results indicate that a decrease in ITZ content or an increase in thickness can lead to a decrease in the damping ratio of specimens;a degeneration in the elastic modulus of ITZ or mortars can also draw a same conclusion,but the impact of ITZ′ s elastic modulus is more significant than that of mortars.更多还原