Abstract This paper aims to study the blast-resistant behavior of one-way simply-supported reinforced ultra-high performance concrete (UHPC) panels through field tests and numerical simulations. Firstly, by designing a box-like blast loading apparatus, both three reinforced UHPC panels and three reinforced normal strength concrete (NSC) control panels were fabricated and tested under medium-range explosions from end-detonated cylindrical charges with different scaled distances (0.5~1.0 m/kg1/3). The valuable data including the explosion-induced incident and reflected overpressure-time histories, deflection- and acceleration-time histories, as well as the post-blast damage of panels were obtained and assessed experimentally. The superiority of UHPC as a blast-resistant material was proved quantitatively by comparison with NSC. Then, the corresponding 3D finite element (FE) model was established by adopting the program LS-DYNA, both the blast loadings induced by the medium-range explosions and the constitutive model parameters of UHPC were mainly concerned. The applicability of the CONWEP method in predicting the blast overpressures was verified, but the prediction precision declines with the decrease of scaled distance since the influences of charge shape and detonation point enhanced accordingly. Moreover, based on the systematic static and dynamic mechanical tests data, the parameters of Karagozian & Case concrete (KCC) model describing the strength surface, equation of state (EOS), damage evolution, and strain rate effect of UHPC were calibrated. Finally, the present FE model, numerical algorithm and the calibrated model parameters were fully verified by comparing the numerical results with the test data, which could provide reference for the evaluation and design of UHPC structures under blast loadings.

中文翻译：

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增强型 UHPC 面板在中程爆炸下动态行为的实验和数值研究

摘要 本文旨在通过现场试验和数值模拟研究单向简支钢筋超高性能混凝土（UHPC）板的抗爆性能。首先，通过设计一个盒状爆炸加载装置，制造了三个增强UHPC面板和三个增强正常强度混凝土（NSC）控制面板，并在不同比例距离（0.5~ 1.0 m/kg1/3)。获得并通过实验评估了包括爆炸诱发事件和反射超压时间历程、偏转和加速时间历程以及面板的爆炸后损坏在内的有价值的数据。与 NSC 相比，UHPC 作为抗爆材料的优越性得到了定量证明。然后，采用LS-DYNA程序建立了相应的3D有限元（FE）模型，主要关注中程爆炸引起的爆炸载荷和UHPC的本构模型参数。验证了CONWEP方法在预测爆炸超压中的适用性，但由于装药形状和爆点的影响相应增强，预测精度随着缩放距离的减小而下降。此外，基于系统的静态和动态力学测试数据，对描述 UHPC 强度表面、状态方程 (EOS)、损伤演化和应变率效应的 Karagozian & Case 混凝土 (KCC) 模型的参数进行了校准。最后，目前的有限元模型，