爆炸冲击震动下柔性基础上浮放设备的抛离分析
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摘要
核武器或常规武器爆炸冲击作用将会引起地下工程结构底板振动,强烈的振动可能导致搁置在结构底板上的设备发生抛离、倾倒和损坏,这是爆炸冲击隔震设计中需要研究解决的一类问题。本文将地下工程结构底板简化为单向板,分析其受到冲击震动时的弹性动力反应,推导结构底板的振动加速度同冲击作用时间、峰值、结构自振特性之间的关系,根据抛离条件分析了浮放设备的抛离规律,结果表明:冲击荷载峰值越大,浮放设备越容易抛离;浮放设备位置离侧墙越远越容易抛离,其中底板中点处为最易抛离点;结构的自振周期越小,浮放设备越易抛离;冲击波升压时间越小,浮放设备越容易抛离;冲击波持续时间越小,浮放设备越容易抛离。
The underground engineering floor will vibrate under nuclear explosion and conventional weapon blast. The free-standing equipment on the floor will be kicked off, lose the balance or be damaged. This kind of problem must be studied and solved in the design of blast shock isolation. The engineering floor's elastic dynamic response under blast shock is analysed , modeling the engineering floor as fixed-end beam. The relations of floor acceleration to load and characteristics of structure's free vibration are deduced. Basing on the various condition of kick-off, the rules of free-standing equipment kick off are analysed. The studied results indicate that the higher the peak value of load is,the more easily the free-standing equipment is kicked off; the longer the distance between the free-standing quipement and side-wall is,the more easily the free-standing equipment is kicked off, and the middle point of the engineering floor is the very point to be kicked off most easily;the lower the natural vibration period is, the less the rise time of the blast wave is, the blast wave sustains, the more easily the free-standing equipment is kicked off.
The underground engineering floor will vibrate under nuclear explosion and conventional weapon blast. The free-standing equipment on the floor will be kicked off, lose the balance or be damaged. This kind of problem must be studied and solved in the design of blast shock isolation. The engineering floor's elastic dynamic response under blast shock is analysed , modeling the engineering floor as fixed-end beam. The relations of floor acceleration to load and characteristics of structure's free vibration are deduced. Basing on the various condition of kick-off, the rules of free-standing equipment kick off are analysed. The studied results indicate that the higher the peak value of load is,the more easily the free-standing equipment is kicked off; the longer the distance between the free-standing quipement and side-wall is,the more easily the free-standing equipment is kicked off, and the middle point of the engineering floor is the very point to be kicked off most easily;the lower the natural vibration period is, the less the rise time of the blast wave is, the blast wave sustains, the more easily the free-standing equipment is kicked off.
引文
1严东晋.爆炸冲击震动下隔震问题研究[R].解放军理工大学,2000
2[美]R.W.克拉夫,J.彭津著,王光远译.结构动力学[M].北京:科学出版社,1981
3王年桥编.防护结构计算原理与设计[M].南京:工程兵工程学院出版,1998
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5田力,李忠献.地下爆炸冲击波引起的基底滑移隔震建筑的动力响应[J].爆炸与冲击,2004,24(1):16—23
6许学忠,李庆山,楼潍涛,习开东,刘瑛,蔡宗义.地下封闭爆炸引起的地表的冲击与隔离[J].振动与冲击,1996,15(1):29—32
7王彦林,唐德高.地震作用下浮放设备动力分析[J].应用科技,2004,31(5):58—60
2[美]R.W.克拉夫,J.彭津著,王光远译.结构动力学[M].北京:科学出版社,1981
3王年桥编.防护结构计算原理与设计[M].南京:工程兵工程学院出版,1998
4严东晋,唐德高,钱七虎.爆炸冲击振动下人体抛离问题的分析[J].爆炸与冲击,1999,19(4):376—379
5田力,李忠献.地下爆炸冲击波引起的基底滑移隔震建筑的动力响应[J].爆炸与冲击,2004,24(1):16—23
6许学忠,李庆山,楼潍涛,习开东,刘瑛,蔡宗义.地下封闭爆炸引起的地表的冲击与隔离[J].振动与冲击,1996,15(1):29—32
7王彦林,唐德高.地震作用下浮放设备动力分析[J].应用科技,2004,31(5):58—60
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