爆炸荷载作用下梁板结构反弹机理分析  

Rebound mechanism analysis in beams and slabs 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：《建筑结构学报》2012年第2期64-71,共8页Journal of Building Structures

基　　金：国家自然科学基金重点项目(50678094)

摘　　要：基于等效单自由度体系和分布参数体系研究了爆炸荷载作用下梁板结构在弹性阶段的反弹机理,给出了5种常用荷载作用下的单自由度弹性反弹曲线,进一步建立了典型加劲肋钢板有限元模型,对其在塑性阶段的反弹机理进行了数值模拟。研究结果表明:荷载作用时间越短,反弹越严重,相反,荷载作用时间越长,反弹越小;当荷载作用时间无穷大时,反弹抗力约为正向抗力的50%;荷载形式的改变对反弹影响较大;阻尼对结构的反弹影响显著,设计时建议按30%折减;当结构进入塑性阶段后,反弹效应减弱,反弹规律与弹性阶段类似。The rebound mechanisms of the elastic response of beams and slabs subjected to blast loading were proposed with the equivalent single degree of freedom（SDOF） method and the distributed parameter system, respectively. The elastic rebound curves of single degree system subjected to five common loads were also given. The research further establishes a finite element model of typical stiffener steel plate for the numerical simulation of the plastic response to investigate by the rebound mechanism. The results show that the rebound will be more severe with the shorter duration, when the duration is infinity, and the rebound resistance is about 50% of the positive resistance. The effect of the changes of load shape on the rebound can not be neglected. The 30% reduction effect of damping should be considered in the practical design as the effect of damping ratio on rebound is obvious. In the phase of the plastic response, the rebound will be decreased, with the rebound laws similar to that in the elastic phase.

关 键 词：爆炸荷载 梁板结构 有限元分析 反弹机理 等效单自由度体系 分布参数体系 

分 类 号：TU399[建筑科学—结构工程] TU312.1