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爆炸碎片导致的次生破坏和人员伤亡往往是巨大的,正确了解建筑物结构可能产生的碎片分布对其抗爆防爆设计至关重要。该文基于连续损伤力学和微裂缝发展的理论,提出了一种采用等效材料模型分析砌体墙结构在爆炸荷载作用下可能产生的碎片尺寸分布的数值方法,等效材料模型考虑了应变率对材料强度的影响。通过与材料精细模型的对比分析,证明了等效材料模型的可靠性;所提出的数值方法有效地提高了爆炸荷载作用下砌体墙碎片分布的计算效率,可用于预测砌体墙在一定爆炸事件中可能产生的碎片尺寸分布。
Secondary damage and casualties caused by explosive debris are often enormous, and a correct understanding of the possible debris distribution in the structure of the building is crucial to its explosion-proof and explosion-proof design. Based on the theory of continuous damage mechanics and microcrack development, a numerical method for the analysis of the possible size distribution of debris in a masonry wall structure under explosive loading is proposed based on the equivalent material model. The equivalent material model considers the strain rate Effect on material strength. Through the comparison with the fine material model, the reliability of the equivalent material model is proved. The proposed numerical method can effectively improve the computational efficiency of debris distribution under the action of blast load. It can be used to predict the failure of masonry walls in a certain explosion Possible fragment size distribution in the event.