温压弹爆炸冲击波作用下防护门破坏模式研究

Failure mode of a blast door subjected to the explosion wave of a thermobaric bomb

为研究温压弹爆炸冲击波作用下防护门的破坏模式,利用ANSYS/LS-DYNA软件建立了考虑材料应变率效应的分离式钢筋混凝土防护门数值计算模型。对防护门加载温压弹爆炸冲击波波形,分析了防护门的挠度、转角和剪应力,并与TNT的作用结果进行了对比。结果表明:温压弹爆炸冲击波作用下,随着距爆炸源距离的增加,防护门的破坏模式由直剪破坏、弯剪耦合破坏逐渐变为弯曲破坏;防护门的响应与温压弹爆炸冲击波的高冲量有关,温压弹爆炸冲击波作用下防护门的破坏程度大于TNT的作用结果;防护门跨中速度值可以用来快速评估防护门的破坏模式。

To reveal the failure mode of a blast door subjected to the explosion wave of a thermobaric bomb,a separate reinforced concrete numerical model considering strain rate effects of a blast door was established with the dynamic finite element software ANSYS /LS-DYNA.The explosion wave of a thermobaric bomb was loaded on the blast door and the deflection and shear stress of the blast door were analyzed and compared with the shock wave of TNT.The results show that with the distance from explosion increasing,the failure mode of blast door under the thermobaric bomb gradually changes from punching shear failure and mixed flexural-shear failure to flexural failure.The dynamic response of the blast door is related to the high impulse of the thermobaric bomb,and the damage of the blast door under the thermobaric bomb is more serious than that under TNT.The velocity of the mid span can be used to estimate the failure mode of the blast door.