爆炸冲击波与破片对RC桥的耦合毁伤研究  

Damage Characteristics of RC Bridge under Combined Effects of Blast Shock Wave and Fragments Loading

作　　者：李营[1,2] 吴卫国[1] 朱海清[1] 李晓彬[1] 

机构地区：[1]武汉理工大学交通学院,武汉430063 [2]海军装备研究院,北京100161

出　　处：《爆破》2016年第2期142-148,共7页Blasting

基　　金：国防基础研究项目(No.A142008018);中央高校基本科研业务费专项资金资助(No.2014-yb-20);非线性力学国家重点实验室基金(No.LNM201505)

摘　　要：对地导弹成为现代桥梁的重要威胁,其战斗部对桥梁的毁伤作用包括爆炸冲击波和破片群两个方面。研究了导弹战斗部爆炸特性,采用SPH-FEM方法实现了导弹战斗部爆炸、爆炸冲击波与破片耦合毁伤RC桥的全过程仿真,分析了耦合毁伤机理,对比了不同配筋率、爆炸高度等因素对桥梁耦合毁伤效果的影响。得到了以下结论:爆炸冲击波与破片耦合作用明显,耦合作用大于单独作用之和;配筋率影响吸能模式,随着配筋率的提高,桥梁吸能模式发生改变;爆炸高度影响毁伤分布明显,对"破片场"分布也有影响。The guided missile is the main threaten to the modern bridge,of which the destroy impact includes the blast shock wave and the fragments. In order to study the combined effects of blast and fragments loading,the numerical simulation of a RC bridge damaged under warhead exploding is performed with SPH-FEM methods. Several conditions of the bridge with fragments,different reinforcement ratio,and different blast height are discussed to investigate the response mechanisms of the bridge. The results show that the overall damage of the concrete bridge subjected to combined loading is more severe than added damages caused by blast and fragment loading respectively. In addition,the mode of absorbing energy is influenced by reinforcement ratio and the damage distribution as well as the fragments distribution is obviously influenced by the explosion height.

关 键 词：爆炸冲击波 耦合毁伤 数值仿真 破片 RC桥 

分 类 号：U448.25[建筑科学—桥梁与隧道工程]