混凝土细观破坏过程的近场动力学模拟

Mesoscale Fracture Analysis of Concrete by Using Peridynamic

近场动力学(Peridynamic,PD)是一种基于非局部作用思想的理论,解决不连续问题时具有独特优势.首先概述了常规态型PD基本理论(Ordinary State-Based PD,OSB PD),采用了一种新的圆形骨料投放方法,有效地提高了混凝土骨料的投放率,建立了适用于混凝土细观破坏的常规态型PD计算模型.对混凝土结构的细观破坏过程进行了模拟,数值模拟结果与理论解吻合较好,进而分析了混凝土结构细观破坏机理.

Peridynamic based on the nonlocal theory has the unique advantages in solving the discontinuities problems. In this paper,ordinary state-based peridynamic theory is introduced. A new method is used to generate the round aggregate. The example shows efficiency in the aggregate generation. A new ordinary state-based peridynamic approach is proposed to analyze the mesoscale fracture in the concrete structure. Mesocale fracture in concrete plate is simulated with the different loads. The results show that the present mesoscale fracture PD model are suitable for predicting the crack propagation in concrete structures.