内爆条件下建筑物等效载荷研究

为简化建筑物抗内爆设计与评估过程,采用流体动力学计算方法,研究了封闭房间中心内爆条件下建筑构件表面的超压载荷分布特性;并考虑泄爆面积对超压载荷特性的影响,将内爆载荷等效为构件表面的双三角均布脉冲载荷,提出了等效载荷的近似计算方法.根据量纲分析以及典型房间在不同TNT当量内爆条件下的数值计算,得到了典型房间中心内爆炸等效载荷的经验公式.通过与内爆工况下结构动力响应计算结果的比较验证了该方法的有效性. 

Investigation on the Equivalent Loading of Constructions Under Internal Explosion

For the simplification of anti-explosion design and evaluation processes of buildings, it is significant to calculate the equivalent dynamic loading for the buildings subjected to internal explosion. By means of hydrodynamic analysis method, the characteristics and distribution of the over-pressure on the surface of the structural members of a closed room subjected to central explosion were first studied. Based on the numerical results, the blast loading acting on the structures could be equivalent to be a bi-triangular uniform impulse, and the calculation method for this equivalent load was given, in which the influences of release area of the room were considered. Finally, by dimensional analysis and a series of numerical simulations, the empirical relationship between the equivalent load and the real explosion situation was obtained. The comparison between the simulated dynamic responses of the structures subjected to internal explosive and equivalent loading shows the validity of the equivalent method presented in this research.