爆炸荷载作用下防护门反弹效应的影响因素分析  

THE INFLUENCING FACTOR ANALYSIS OF REBOUND EFFECT FOR PROTECTIVE DOORS SUBJECTED TO BLAST LOADING

作　　者：郭东[1] 刘晶波[1] 闫秋实[1] 

机构地区：[1]清华大学土木工程系,北京100084

出　　处：《工程力学》2011年第12期206-212,共7页Engineering Mechanics

基　　金：国家自然科学基金项目(50678094)

摘　　要：防护门在常规武器爆炸荷载作用下将发生反弹效应,门体将承受反弹所引起的较大反向应力,反弹力达到一定程度,铰页和闭锁在反弹力的作用下就会先于门扇主体发生破坏。该文推导了爆炸荷载作用下防护门反弹力的解析计算公式,分析了各种因素,包括:边长比、荷载作用时间、阻尼比、荷载形式以及冲击波负压等对反弹效应的影响规律,结果表明:随着边长比的增大,防护门正向、负向动剪力峰值逐渐减小;阻尼和冲击波负压对防护门的最大正向动力响应影响不大,可以忽略,但对最大负向动剪力影响显著;指数型荷载形式对防护门正向、负向动剪力峰值有一定的影响,但影响不大,可以忽略。The rebound effect could occur in protective doors under the blast loading of a conventional weapon,which results in a high rebound force in the opposite direction.The hinge and latch would be destroyed prior to the damage of the door body if the rebound force were high enough.The exact analytical formulas of the rebound force for protective doors are derived.All factors are analyzed including the side-length ratio,duration,damping ratio,loading style and negative phase of a blast loading,etc.It is demonstrated that the peak value of a positive and negative shear force for protective doors are gradually reduced with the increases of the side-length ratio;the role of a damping ratio and the negative phase of a blast loading to a positive shear force are very limited and the relevant effect even could be ignored,but there is the obvious effect on the negative shear force;the influence of an exponential blast loading on the peak value of both the positive and negative shear forces can be found to a certain extent.

关 键 词：爆炸荷载 防护门 反弹效应 影响因素 负压 

分 类 号：TU352.13[建筑科学—结构工程] TJ91[兵器科学与技术—武器系统与运用工程]