Abstract Based on advanced numerical simulation technologies, such as the birth and death of element technique, large displacement technique, and fluid-solid coupling mechanism, and combined with the strain rate effect of concrete and steel materials, a complicated finite element model of a TNT–air–slab system is set up using the nonlinear explicit dynamic finite element analysis software LS-DYNA. A series of numerical simulation analyses is conducted on the reinforced concrete slab to evaluate the properties of the blast shock wave at the back of the slab. First, the typical characteristics of the blast shock waves at the front and back of the slab are described concisely. Then, the relation between the incident wave and the reflected wave is built by further studying the influence of the slab on the properties of the reflected wave at the front of the slab. And then, the relation between the reflected wave and the reformed wave is established by analyzing the effect of the slab on the change law of the reformed wave at the back of the slab. Finally, the basic steps for predicting the properties of the reformed wave are given considering the effect of the reinforced concrete slab on it. In addition, the case study demonstrates that the predicted results are true and reliable, and it indicates that the proposed method can accurately and effectively predict the properties of the reformed wave at the back of the reinforced concrete slab.

中文翻译：

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钢筋混凝土板对冲击波特性的影响

摘要 基于单元技术的诞生与消亡、大位移技术、流固耦合机制等先进的数值模拟技术，结合混凝土和钢材的应变率效应，建立了复杂的TNT有限元模型。采用非线性显式动力有限元分析软件LS-DYNA建立-air-slab系统。对钢筋混凝土板进行了一系列数值模拟分析，以评估板背面爆炸冲击波的特性。首先，简述了板坯前后冲击波的典型特征。然后，通过进一步研究板坯对板坯前端反射波特性的影响，建立了入射波与反射波的关系。然后，通过分析板坯对板坯背面重整波变化规律的影响，建立反射波与重整波的关系。最后，考虑了钢筋混凝土板对其的影响，给出了预测改造波特性的基本步骤。此外，案例研究表明预测结果真实可靠，表明所提出的方法能够准确有效地预测钢筋混凝土板背面的改造波特性。通过分析板坯对板坯背面重整波变化规律的影响，建立反射波与重整波的关系。最后，考虑了钢筋混凝土板对其的影响，给出了预测改造波特性的基本步骤。此外，案例研究表明预测结果真实可靠，表明所提出的方法能够准确有效地预测钢筋混凝土板背面的改造波特性。通过分析板坯对板坯背面重整波变化规律的影响，建立反射波与重整波的关系。最后，考虑了钢筋混凝土板对其的影响，给出了预测改造波特性的基本步骤。此外，案例研究表明预测结果真实可靠，表明所提出的方法能够准确有效地预测钢筋混凝土板背面改造波的特性。