钢筋混凝土结构破坏过程的近场动力学模拟

采用近场动力学(Peridynamics,PD)方法对钢筋混凝土结构破坏过程进行模拟,在"键"型近场动力学模型的基础上,考虑物质点对间的转动以突破泊松比的限制,采用能够描述混凝土材料的拉压异性和断裂特征的损伤模型,引入动态松弛、分级加载、平衡收敛准则和冲击接触等算法,建立了能准确描述钢筋混凝土结构破坏的近场动力学模型。模拟了钢筋混凝土梁在不同荷载作用下破坏的全过程,裂纹扩展路径以及最终破坏形式均与试验结果吻合,为解决工程结构破坏问题提供了一种有效的方法。

Simulating the failure process of reinforced concrete structure by using peridynamics

The peridynamics method is used to simulate the failure process of reinforced concrete structures. Based on the bond based peridynamics model, the rotational degrees of freedom between material points are considered to break through the limit of Poisson’s ratio. Using a damage model to describe the tensile and compressive properties and fracture characteristics of concrete material and introducing dynamic relaxation,graded loading, equilibrium convergence criterion and impact contact algorithm, a peridynamics model is established which can accurately describe the failure of reinforced concrete structures. The whole failure process of reinforced concrete beams under different loads is simulated. The crack propagation path and the final failure mode are consistent with the test results, and it provides an effective method to solve the failure problem of engineering structures.