Abstract The increasing threat of terrorist attacks and the risk of accidental explosions has raised the alarm on structural design, and consequently, the dome structure as the classical building configuration model for public buildings requires safe and reliable defence capabilities against blast loads for the duration of its lifespan. Some deterministic blast load models for specific blast loading scenarios are unable to take the risk of damage into consideration. Therefore, the variability and uncertainty of blast loads need to be studied and quantified. In this study, a probabilistic blast load model is proposed based on a series of repeated field trials. The repeatability of explosive mass and size, detonator type and location, stand-off distance, field condition, data acquisition device and the structure were ensured to realise consistency and standardisation. The experimental results reveal a high degree of variability and uncertainty in the impulse, reflected overpressure and decay coefficient distributed on the studied dome under the effect of external surface explosions. The decay coefficient of a blast wave on the dome has a large variability with a coefficient of variation of 55% when the impulse is less than 8%, which demonstrates that the impulse distributed on the dome has higher precision than other blast load parameters. Furthermore, statistical analysis shows that the normal distribution is the best-fit probability blast load model in an anti-explosion protection design. Furthermore, the accuracy of some blast load predictive methods was also assessed. It was found that the semi-empirical CONWEP air blast code is not an appropriate blast load model for the dome. However, the Arbitrary Lagrangian-Eulerian model is a safer and relatively more accurate method for describing the distribution and variation characteristics of a blast wave distributed on the dome, which can serve as an approximate mean blast load.

中文翻译：

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外表面突发爆炸下圆顶的概率爆炸载荷模型

摘要 日益增加的恐怖袭击威胁和意外爆炸风险给结构设计提出了警钟，因此作为经典的公共建筑构型模型的穹顶结构，在其使用过程中需要安全可靠的爆炸荷载防御能力。寿命。某些针对特定爆炸载荷场景的确定性爆炸载荷模型无法将损坏风险考虑在内。因此，需要研究和量化爆炸载荷的可变性和不确定性。在这项研究中，基于一系列重复的现场试验提出了一种概率爆炸载荷模型。炸药质量和尺寸、雷管类型和位置、隔离距离、现场条件、确保数据采集装置和结构实现一致性和标准化。实验结果表明，在外表面爆炸的影响下，所研究的穹顶上分布的脉冲、反射超压和衰减系数具有高度的可变性和不确定性。冲击波在穹顶上的衰减系数具有较大的变异性，当冲量小于8%时变异系数为55%，表明冲击波分布在穹顶上的精度高于其他爆炸载荷参数。此外，统计分析表明，正态分布是防爆保护设计中最适合的概率爆炸载荷模型。此外，还评估了一些爆炸载荷预测方法的准确性。结果发现，半经验的 CONWEP 空气爆炸规范不是圆顶的合适爆炸载荷模型。然而，Arbitrary Lagrangian-Eulerian 模型是一种更安全、相对更准确的方法来描述分布在穹顶上的冲击波的分布和变化特征，可以作为近似的平均冲击载荷。