钢箱梁爆炸冲击局部破坏的数值模拟  

Numerical simulation for local failure of a steel box girder under blast loading

作　　者：蒋志刚[1] 朱新明[1] 严波[1] 姚术健 

机构地区：[1]国防科学技术大学指挥军官基础教育学院渡河系,长沙410072

出　　处：《振动与冲击》2013年第13期159-164,共6页Journal of Vibration and Shock

摘　　要：运用LS-DYNA非线性有限元软件,采用ALE多物质流-固耦合算法,研究了汽车炸弹(TNT当量100～500 kg)桥面爆炸冲击作用下钢箱梁的局部破坏。结果表明,钢箱梁局部破坏模式有两种:(1)桥面板和底板均破口;(2)桥面板破口,底板产生局部塑性大变形。隔板的主要破坏模式为弯曲塑性大变形和破口。破坏参数随炸药当量的增加呈非线性增加。箱体内冲击波对底板、隔板的冲击作用相对较小,顶板破片的冲击作用是底板和隔板产生局部塑性大变形和破口的主要原因。The local failure of a steel box girder under blasting loads of vehicle bomb（TNT equivalent 100-500kg） was investigated with the nonlinear finite element software LS-DYNA and the fluid-solid coupling method ALE Multi-material formulations.The results showed that there are two local failure modes of a steel box girder,one is that the deck and bottom plates rupture locally;the other is that the deck plate ruptures locally and the bottom plate does not rupture but has a local large plastic deformation;the main failure modes of diaphragms are large bending plastic deformation and rupture;the failure parameters increase nonlinearly with increase in explosive TNT equivalent;the impact effect of shock wave within the box on the bottom plate and diaphragms is less than the impact effect of the deck＇s fragments,the latter is the main cause of the local large plastic deformation and rupture of the bottom plate and diaphragms.

关 键 词：桥梁工程 爆炸冲击 数值模拟 汽车炸弹 

分 类 号：O383[理学—流体力学] TU511[理学—力学]