扁平箱形密闭结构内爆炸的模型试验

为研究扁平箱形密闭结构内部爆炸时侧墙上的荷载,对2种钢筋混凝土模型结构进行了药量递增直至结构破坏的内爆炸实验.利用侧墙上的测点测得压力等试验参数,分析比较了2种模型侧墙上的内爆炸荷载.试验结果表明:作用在结构内表面上的压力是非线性下降的,具有周期性宏观脉动特征,压力时程曲线主要由一个初始主脉冲和几个较大的后续脉冲组成,准静态气体压力很小.结构破坏形式以顶板的双向受弯破坏为主.在结构内部设置抗爆隔墙可有效降低冲击波对结构的破坏.主要结论可供工程设计参考.

Experiment of closed flat box structure subjected to internal detonation

Internal deto natio n ex periments w ith di fferent charg es of TN T in tw o types of reinfo rced concrete model st ructures w ere used to study the internal explosiv e loading o n the wall s of f lat bo x st ructure. Blast g ag es w ere flush-mounted in the w alls of the model box to reco rd blast pressure as it arriv ed a nd propagated o n the wal l. The internal detona tion loading on the w alls o f tw o model box es w as analysed a nd compared. The test resul t show s that the pressure on the wall of structure comes dow n nonlinearly w ith periodic macroscopic pulsation, that the pressure-time histo ry figures are compo sed of one main pluse a nd sev eral relativ ely intensiv e pluses, and tha t the va lue o f quasi static g as pressure is very small. The tw ow ay f lexural failure of roof i s the ma jo r fo rm of model fracture. Fo r the w hole st ruct re i t is a n effectiv e w ay to set antidetona tion wal ls inside the st ructure to reduce the damag e subjected to the blast. The resul ts of fer v alueable references to engineering desig n.