化爆冲击波作用下建筑物内压缩波参数计算

根据空气动力学原理，分析了外部化爆条件下冲击波阵面后压缩气体经外墙孔口的流动过程，提出了室内平均压力的计算方法；针对砖墙填充的钢筋混凝土框架结构房屋，研究室内外压力作用下墙体的破坏和碎块飞散过程，得到了室内压缩波参数的确定方法，并运用已有试验数据对该方法的有效性进行了验证；通过算例分析了冲击波超压、孔口面积及墙体厚度对室内压缩波升压时间的影响，结论如下:前墙开孔房屋室内升压时间随孔口面积的增大而减小，外墙破坏时，封闭房屋室内升压时间随着墙壁厚度的减小和室外超压的增大而逐渐减小。

STUDY ON COMPRESSION WAVE PARAMETERS IN CONSTRUCTION UNDER CHEMICAL SHOCK WAVE ATTACK

Based on the aerodynamics theory,the process of compressible gas behind the shock wave front flow through wall orifice is analyzed and the calculation method of internal average pressure is put forward,under an external chemical explosion condition.For brick masonry infilled reinforced concrete frame structures,the failure characteristics of exterior wall and the flying process of its fragments under internal and external pressure are studied.The calculation method of internal compression wave parameters is obtained and its efficiency is verified by the published experimental data.The influence of shock wave overpressure,orifice area and wall thickness on the internal rise time are analyzed by computational examples.The results show that in opening chambers,the internal rise time decreases as the orifice area increases.In close chambers,when the exterior wall failure happens,the internal rise time decreases with the decrease of wall thickness and the increase of external overpressure.