【摘要】 为研究混凝土细观结构对于混凝土受拉性能的影响,采用自编程序建立骨料形状为圆形、椭圆形以及随机多边形三种混凝土细观模型。并批量插入粘结单元,形成粘结裂缝模型。与已有实验对比验证数值模型的准确性。在此基础上讨论了网格尺寸、骨料形状以及数值模型细观参数对于混凝土受拉性能的影响,结果表明:混凝土细观粘结裂缝模型可以很好的模拟混凝土宏观开裂,网格尺寸对于混凝土细观粘结裂缝模型的受拉性能、裂缝扩展形态影响很小,骨料随机分布以及骨料形状对于混凝土裂缝扩展形态影响很大,对于受拉性能影响很小。界面粘结单元的粘结强度和断裂能对混凝土的宏观受拉性能有较大的影响,研究混凝土的力学性能时应优先考虑界面的影响。更多还原

【Abstract】 In order to analyze the influence of concrete meso-structure on the tensile properties of macro-concrete,three concrete meso-models with aggregate shapes of round,oval and random polygon were established by self-programming.And the bonding units are inserted in batches to form a bonding crack model.Compared with existing experiments,the accuracy of the model is verified.On this basis,the influences of grid size,aggregate shape and meso-parameters of numerical model on the tensile properties of concrete are discussed.The results show that the meso-bonding crack model of concrete can simulate concrete cracking well,while the grid size has little influence on the tensile properties and crack propagation patterns of concrete meso-bonding crack model,while the random distribution of aggregates and aggregate shape have great influence on the crack propagation patterns of concrete.The bond strength and fracture energy of interface bond unit have great influence on the macroscopic tensile properties of concrete,so it is necessary to consider the influence of interface when studying the mechanical properties of concrete.更多还原