Concrete is prone to damage under explosive loads, which can cause a large number of casualties and property losses. The concrete fragmentation process during explosion is transient and dynamic, and the experimental measurement of such events is difficult and risky to conduct, and the intermediate explosion process is difficult to observe in the experimental tests. Therefore, the numerical simulation is an ideal method to model and simulate the explosion process of concrete. Different from the traditional finite element method, Peridynamics (PD) method uses the spatial integral equation to replace the traditional local differential equation to solve the fragmentation problem with massive and complex discontinuous patterns. In this study, a peridynamics (PD) model is developed to simulate the failure process of reinforced concrete (RC) structures under radial blasting. Concrete PD models with different cavity sizes and reinforcement conditions were established and calibrated with the experimental data. We find that the crack growth and damage pattern obtained in the peridynamics simulation is consistent with the experiment test results, which verifies the feasibility of peridynamics method as a modeling tool for modeling concrete damage under explosive load and for evaluating anti-explosion performance of RC concrete structures.

中文翻译：

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径向爆破作用下钢筋混凝土结构损伤的近场动力学模拟


混凝土在爆炸性载荷下容易损坏，这可能导致大量人员伤亡和财产损失。爆炸过程中混凝土破碎过程是瞬态和动态的，此类事件的实验测量难度大且风险大，在实验试验中难以观察到中间爆炸过程。因此，数值模拟是模拟混凝土爆炸过程的理想方法。与传统的有限元方法不同，近场动力学 （PD） 方法使用空间积分方程代替传统的局部微分方程来解决具有大量复杂不连续模式的碎片问题。本研究开发了一种近场动力学 （PD） 模型来模拟径向爆破下钢筋混凝土 （RC） 结构的破坏过程。建立了不同空腔尺寸和加固条件的混凝土 PD 模型，并利用实验数据进行了标定。我们发现，在近场动力学模拟中获得的裂纹扩展和损伤模式与实验测试结果一致，验证了近场动力学方法作为建模工具对爆炸载荷下混凝土损伤进行建模和评价 RC 混凝土结构抗爆性能的可行性。