内部爆炸载荷作用下砌体墙结构的失效规律

Failure Characteristics of Masonry Wall under Internal Explosion

为了探究钢筋混凝土框架-砌体墙建筑物的内爆毁伤效应,开展了内爆载荷下砌体墙结构动力响应和失效规律研究。采用数值模拟方法,并结合理论分析,研究了不同当量内爆载荷下砌体墙的失效机理以及失效形式转化过程。结果表明,小药量内部爆炸时,砌体墙的主要失效形式为弯曲导致的墙面开裂。随着药量增加,墙体边界在首道冲击波反射超压作用下发生以剪切变形为主导的失效。而在大药量条件下,首道冲击波超压使砌体墙材料达到极限抗压强度而发生压溃失效。研究结果可为砌体墙结构毁伤评估与防护设计提供技术参考。

In order to investigate the internal explosion damage effect of reinforced concrete frame-masonry wall,the dynamic response and failure characteristics of masonry walls under internal explosion were studied.Based on numerical simulation and theoretical analysis,the failure mechanism and failure transformation process of masonry wall under internal explosion with different TNT equivalence were analyzed.The results showed that under internal explosive with small mass of explosive,the failure of the masonry wall is mainly due to bending effect.With the increase of the mass of explosive,the failure dominated by shear deformation will happen due to the reflection of the first shock wave.For the cases with larger mass of explosive,compressive failure occurs because the overpressure of the first shock wave reaches the ultimate compressive strength of masonry wall.The research results can provide technical reference for explosive damage evaluation and protection design of masonry wall structures.