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采用Autodyn仿真软件中的SPH粒子算法,模拟大楼在大当量装药外部爆炸时产生崩落碎块的动态毁伤效应,提供可视化效果。通过单体构件仿真展示钢筋混凝土和砖砌体结构不同时刻的动态破坏细节,获得了冲击波超压数值、碎块崩落速度和动能值。通过数值模拟得出,崩落碎块速度最高可达152 m/s,动能18 000 J,对建筑物内人员及设备有很大杀伤破坏能力。在同等当量的外爆条件下,崩落碎块速度砖砌体结构大于钢筋混凝土,整体平均速度要大25%左右;墙体所受超压及反射超压,钢筋混凝土远大于砖砌体,平均大于76%以上。为大楼的毁伤评估提供了科学经济的预测手段。
The SPH particle algorithm in Autodyn simulation software is used to simulate the dynamic damage effect of building debris caused by external explosion of large equivalent charge to provide visualization effect. The dynamic failure details of reinforced concrete and brickwork structures at different times are shown by the simulation of single component, and the value of overpressure of shock wave, the velocity of crushing and the kinetic energy are obtained. Through numerical simulation, it can be concluded that the speed of collapse debris reaches 152 m / s and the kinetic energy is 18 000 J, which has great destruction and damage to personnel and equipment in the building. Under the same equivalent detonation conditions, the brickwork structure of collapse debris velocity is larger than that of reinforced concrete, and the overall average velocity is about 25% larger. The overpressure and reflection overpressure of the wall body is much greater than that of the brickwork, the average More than 76%. It provides a scientific and economical forecast method for building damage assessment.