冲击波负压对防护门反弹效应的影响分析

Analysis on rebound effect of blast door under negative phase pressures

对冲击波负压作用下防护门的反弹效应进行了研究,采用合理的荷载假定形式,推导了考虑负压影响的防护门反弹力的精确解析公式,评价了负压对防护门反弹效应的影响规律:即随着比例爆距的增大,负压峰值相对于正压峰值逐渐增大,反弹增大效应也较明显,但这样一个响应可能仅对比较小的超压值才出现,由于正压、负压峰值都较小,防护门刚度较大,故增大的反弹力不足以对防护门造成破坏,设计中可以不考虑负压的影响。

The rebound effect of blast door was studied under the negative phase of blast loading. The reasonably approximated blast pulse shape was adopted to obtain the exact analytical formulas for rebound force of blast door, taking into account the negative phase effect. The negative phase effect of blast waves on blast door was assessed. It is demonstorated that with the increase of scaled distance, the peak value of negative pressure, relatively to ti^e peak value o~ positive pressure, increases gradually and in the meantime, negative pressure shows the increasing effects on the rebound of blast door. But the response of this type may emerge only under small overpressure. Due to the small peak values ot both positive and negative pressures, the blast door seems to be relatively stiff enough and the blast door would not b~~ damaged by the increased rebound effect. So, the effect of negative pressure might be ignored in the design of protectiw~ structures.