钢箱梁爆炸冲击局部破坏的数值模拟

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振动与冲击 ›› 2013, Vol. 32 ›› Issue (13) : 159-164.

论文

钢箱梁爆炸冲击局部破坏的数值模拟

蒋志刚，朱新明，严波，姚术健

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Numerical Simulation on the Local Failure of A Steel Box Girder under Blast Loading

JIANG Zhigang ZHU Xinming YAN Bo YAO Shujian

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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100-500kg）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。

Abstract

The local failure of a steel box girder under blasting loads of vehicle bomb (TNT equivalent 100-500kg) were investigated with nonlinear finite element software LS-DYNA and the Fluid-Solid coupling arithmetic method of ALE Multi-material formulations. The results showed that there are two local failure modes of the steel box girder：（1）the deck and bottom plate ruptured locally；（2）the deck ruptured locally and the bottom plate not ruptured with local large plastic deformation. The main failure modes of the diaphragms are large bending plastic deformation and rupture. The failure parameters increase nonlinearly with the increase of the explosive TNT equivalent. The impact effect of shock wave within the box on the bottom plate and diaphragms is less than that of the deck’s fragments，which is the main cause of the local large plastic deformation and rupture of the bottom plate and diaphragms.

导出引用

蒋志刚;朱新明;严波;姚术健. 钢箱梁爆炸冲击局部破坏的数值模拟[J]. 振动与冲击, 2013, 32(13): 159-164

JIANG Zhigang ZHU Xinming YAN Bo YAO Shujian. Numerical Simulation on the Local Failure of A Steel Box Girder under Blast Loading[J]. Journal of Vibration and Shock, 2013, 32(13): 159-164