钢筋砼结构爆炸后碎块抛射和散布的研究

Research of Debris Throwing and Dispersion after Blasting of Reinforced Concrete Structure

为了解结构发生突发性爆炸后,对周围环境及生命财产安全所造成的危害,综合应用各种计算机数值仿真技术,对爆炸中所产生的碎块在空气中的飞行过程及其散布特性进行了数值模拟。数值模拟以LS-DYNA程序对结构的爆炸实时响应模拟结果为基础,采用自行编写的C++程序进行碎块飞行和散布的计算。碎块自由飞行时所受到的空气阻力与其速度的平方成正比,在各试验结果的基础上,对碎块的阻力系数提出合理的假设,并应用于阻力公式及运动方程。在进行碎块散布特性的统计分析时,提出了一些重要的统计分析数据项及方法,这些统计结果和方法将有助于理性地了解结构物爆炸所造成的危害。

In order to estimate the harm to the surrounding environment and lives due to the structure blasting, the free flying process of debris and dispersion pattern after blasting of a concrete structure has been simulated by the numerical simulation. The numerical simulation adopts a C ＋ ＋ program, and the input data is based on the structure real-time response under blast load, achieved by the LS-DYNA program. The drag force experienced by debris is proportional to the square of the debris velocity. The drag coefficient is reasonably assumed based on the limited experi- mental data and has been assigned to the drag formula and equations of motion. Some key statistic data and its analysis methodology being brought forward are helpful to comprehend the hazards due to the structure blasting in the statistical analysis of debris dispersion pattern.