Ultra high Performance Fiber Reinforced Concrete Panel Subjected to Severe Blast Loading
Ultra high Performance Fiber Reinforced Concrete Panel Subjected to Severe Blast Loading
复制标题
承受剧烈爆炸载荷的超高性能纤维增强混凝土板
DOI：
10.14429/dsj.70.15835
复制
发表时间：
2020
影响因子：
0.9
通讯作者：
H. Pham
中科院分区：
文献类型：
--
作者：
V. Mai;N. Vu;V. Nguyen;H. Pham
试验研究在揭示爆炸荷载作用下结构的动力特性方面起着至关重要的作用。然而，高成本和复杂的技术要求，特别是对于全尺寸结构，仍然是进行这样一系列测试的巨大缺点。因此，有限元方法是非常需要的，以提供补充信息，以前的实验，并使进一步的参数研究，而无需测试。本文提出了一个数值研究进行了解超高性能纤维混凝土（UHPFRC）板在严重爆炸荷载下的行为。作者设计了一个子程序与8个数量的解决方案相关的状态变量，32个力学常数，集成与Abaqus程序来分析UHPFRC对多个爆炸冲击的动态行为，使用Johnson-Holmquist 2损伤模型，将损伤和剩余强度的材料。通过仿真结果与试验结果的对比，验证了该子程序的有效性.为了估计爆炸荷载作用下UHPFRC板的结构响应，通过改变输入参数，包括板的厚度、间距和钢筋体积，考虑了其他研究方案。UHPFRC面板的挠度、应变和损伤的变化，以及钢筋应变，也进行了评估。通过获得的重要结果，强烈建议将UHPFRC板用作安装在关键基础设施附近的防护屏障，以防止严重的爆炸荷载
Experimental studies play a crucial role in shedding light on the dynamic behaviour of structures under blast loading. However, high costs and complicated technical requirements, particularly for full-scale structures, are still huge disadvantages to conduct such a series of tests. Hence, the finite element method is much needed to provide supplementary information to previous experiments and to enable further parametric studies without testing. This article presents a numerical investigation carried out to understand the behaviour of ultra high performance fiber reinforced concrete (UHPFRC) panels under severe blast loading. The authors designed a subroutine with eight numbers of solution-dependent state variables, 32 mechanical constants, integrated with the Abaqus program to analyze the dynamic behaviour of UHPFRC against multiple blast impacts, using the Johnson-Holmquist 2 damage model incorporating both the damage and residual strength of the material. The subroutine was validated by comparing the simulation results with test results. For the purpose of estimating the structural response of the UHPFRC panel subjected to blast loading, other studying scenarios were considered by varying input parameters, including the thickness of the panel, stand-off distance, and steel reinforcement bar volume. The variations in deflection, strain, and damage of the UHPFRC panel, as well as the steel reinforcement strain, were also evaluated. Through important obtained results, the UHPFRC panel is strongly recommended for a protective barrier installed in the vicinity of critical infrastructure against severe blast loading