不同打击方式对桥梁的毁伤效果研究

Study of the effect of different strikes on the damage of bridges

桥梁是交通运输的重要媒介,战时极易因遭受攻击而毁坏。为研究弹药不同打击方式对桥梁毁伤效果的影响,利用LS-DYNA软件开展了深入数值模拟研究。将模拟结果与对应工况试验结果对比,验证了计算模型的可靠性,开展了不同打击方式的数值模拟,计算了各工况的桥梁剩余承载力,揭示出不同打击方式对桥梁的毁伤影响。结果表明:面板中心接触爆时桥梁破坏程度最明显,面板下方爆炸毁伤效果次之,桥梁正上方空爆毁伤效果最差;同样的侵彻爆破战斗部爆心位置在桥面板正中时桥梁剩余承载力较上方空爆打击时削弱8.2%。研究结果可为桥梁抗爆设计、弹药打击方式及桥梁的毁伤评估提供参考。

Bridges are an important medium of transportation and are very easy to be destroyed by attacks during wartime.In order to study the effects of different striking modes of munitions on the destruction effect of bridges,in-depth numerical simulation studies were carried out by using LS-DYNA software.The simulation results are compared with the corresponding test results to verify the reliability of the calculation model,and the numerical simulation of different striking modes is carried out to calculate the residual bearing capacity of bridges in different working conditions,so as to reveal the destructive effects of different striking modes on bridges.Conclusions are as follows:the center of the panel contact explosion when the bridge damage is the most obvious,followed by the destruction effect of the explosion below the panel,the worst destruction effect of the bridge directly above the air blast;the same intrusive demolition of the fighting part of the explosion center location in the middle of the bridge deck when the bridge residual bearing capacity than above the air blast strike weakened by 8.2%.The conclusion can provide a reference for the bridge anti-explosive design and munitions strike and bridge damage assessment.