Abstract This paper reports on numerical assessment of the blast response of a heterogeneous composite structure using LS-DYNA solver. There experimentally observed effect of heterogeneity on the overall response of the structure is numerically assessed. Multiple approaches to the introduction of material heterogeneity are proposed, modelled and tested. The numerical results are confronted with the authors’ original experimental program on a full-scale concrete structure subjected to a near field explosion. Tests were carried out on a total of three specimens. All the specimens were subjected to the same close-in blast loading from 25 kg TNT charges placed on steel chairs in the middle of each slab. The chairs provided 450 mm standoff from the top surface of the slab. Two of the analyzed specimens were reinforced concrete slabs 6 m in length, 1.5 m in width and 0.3 m in thickness. The first specimen contained basalt fiber meshes in multiple layers along the depth of the specimen. The second specimen contained two layers of recycled textile sheets 100 mm in total thickness. The third specimen was a commercial hollow-core precast prestressed panel 6 m in length, 1.2 m in width and 0.32 m in thickness. The paper aims to verify and explain the experimental findings. It was numerically proved that the highly heterogeneous concrete-based composite bridge decks consume the blast energy by layer delamination in the pre-determined damage zones. The findings are supported by PDV measurements.

中文翻译：

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非均质混凝土基复合桥面板对近场爆炸响应的数值评估

摘要 本文报告了使用 LS-DYNA 求解器对异质复合结构的爆炸响应进行数值评估。对实验观察到的异质性对结构整体响应的影响进行了数值评估。提出、建模和测试了多种引入材料异质性的方法。数值结果与作者在遭受近场爆炸的全尺寸混凝土结构上的原始实验程序相对。对总共三个样本进行了测试。所有样品都承受了相同的近距离爆炸载荷，这些爆炸载荷来自放置在每个板中间钢椅上的 25 公斤 TNT 装药。椅子提供了距板顶面 450 毫米的间隔。两个分析的标本是钢筋混凝土板，长 6 m，1。宽 5 m，厚 0.3 m。第一个试样沿试样深度包含多层玄武岩纤维网。第二个样本包含两层总厚度为 100 毫米的回收织物片。第三个试件是商用空心预制预应力板，长 6 m，宽 1.2 m，厚 0.32 m。本文旨在验证和解释实验结果。数值证明，高度异质混凝土基复合桥面板在预定损伤区通过分层分层消耗爆炸能量。这些发现得到了 PDV 测量结果的支持。第二个样本包含两层总厚度为 100 毫米的回收织物片。第三个试件是商用空心预制预应力板，长 6 m，宽 1.2 m，厚 0.32 m。本文旨在验证和解释实验结果。数值证明，高度异质混凝土基复合桥面板在预定损伤区通过分层分层消耗爆炸能量。这些发现得到了 PDV 测量结果的支持。第二个样本包含两层总厚度为 100 毫米的回收织物片。第三个试件是商用空心预制预应力板，长 6 m，宽 1.2 m，厚 0.32 m。本文旨在验证和解释实验结果。数值证明，高度异质混凝土基复合桥面板在预定损伤区通过分层分层消耗爆炸能量。这些发现得到了 PDV 测量结果的支持。数值证明，高度异质混凝土基复合桥面板在预定损伤区通过分层分层消耗爆炸能量。这些发现得到了 PDV 测量结果的支持。数值证明，高度异质混凝土基复合桥面板在预定损伤区通过分层分层消耗爆炸能量。这些发现得到了 PDV 测量结果的支持。