基于近场动力学的含细观结构混凝土受压数值模拟

Peri Dynamics Simulation of Concrete Under Compression Based on Meso-Scale Model

为实现混凝土受压试验的数值模拟,尝试构建一种基于蒙特卡罗方法生成骨料参数,然后以此构建包含骨料、界面过渡区、水泥浆体三相细观结构的键基近场动力学(bond-base peridynamics,BB-PD)数值模拟方法。数值模拟的结果表明,键基近场动力学方法和细观模型两者相结合的数值模拟方法能够描述混凝土受压过程中具体形态和力学特征,初步证明这种结合的有效性,同时也体现了近场动力学方法在裂纹扩展、破坏等不连续力学问题方面上的有效性。

In order to conduct numerical simulation of concrete compression,an attempt is made to generate aggregate parameters based on Monte Carlo method,and then construct a bond based peridynamics numerical simulation method in consideration of three-phase mesostructure of aggregate,interface transition zone and cement paste.The results of numerical simulation show that the numerical simulation method combining bond based peridynamics method and meso scale model can describe the specific morphology and mechanical characteristics of concrete under compression,and preliminarily prove the effectiveness of the combination.It also shows the advantage of peridynamics method in analyzing discontinuous mechanical problems such as crack propagation and failure.