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大型地上军火库由于发生偶然的爆炸,相应的钢筋混凝土结构在内部爆炸荷载作用下的动力响应特别是碎片的大小和抛射速度将会对周围的人造成巨大的伤害。因此,合理地预测钢筋混凝土结构的损伤破坏及碎片形成和抛射速度已成为军火库安全性能评估的重要关注问题。该文对箱型封闭空间内钢筋混凝土板在内部爆炸荷载作用下的动力响应进行了数值模拟研究,模型考虑了应变率对钢筋和混凝土材料动力本构特性的影响以及空气-结构之间的流固耦合相互作用,数值分析结果展示了钢筋混凝土板在内部爆炸冲击波和气体压力荷载作用下从损伤破坏、碎片形成到抛射的动态演变过程,混凝土碎片大小和抛射速度与试验结果吻合较好。研究结果表明:爆炸冲击波影响钢筋混凝土板的开裂破坏和碎片的大小,而气体压力荷载对碎片的形成和抛射速度起着重要的作用。
Due to the accidental explosion of a large arsenal on the ground, the dynamic response of the corresponding reinforced concrete structure under internal blast load, especially the size of fragments and the speed of projectile, will cause great harm to the people around them. Therefore, it has become an important issue to evaluate the safety performance of the arsenal by reasonably predicting the damage and damage of the reinforced concrete structure and the formation and ejection velocity of the debris. In this paper, the dynamic response of reinforced concrete slab under internal blast load in a box-type enclosed space is studied numerically. The model considers the effect of strain rate on dynamic constitutive properties of reinforced concrete and concrete, and the air-structure flow The results of numerical analysis show the dynamic evolution of the reinforced concrete slab from damage damage and debris formation to projectile under the internal blast shock wave and gas pressure load. The concrete fragment size and ejection velocity agree well with the experimental results. The results show that blast shock wave affects the cracking and fragment size of reinforced concrete slabs, and the gas pressure load plays an important role in the formation and ejection velocity of debris.