命中角对防护结构口部爆炸毁伤影响的数值分析

为研究装药命中角对防护结构口部爆炸毁伤的影响规律,对直墙拱结构进行了一系列爆炸模拟分析,得到了直墙拱结构拱顶、拱脚和直墙底3个位置的爆炸应力和位移时程曲线。通过分析这3个位置的应力峰值和位移峰值,发现随着装药命中角的增大,拱顶处竖直方向荷载减小,而拱脚处水平方向荷载增大;随着装药命中角的增大,拱顶处竖直方向位移变形减小,而拱脚处水平方向位移变形增大。模拟分析得到的命中角对防护结构口部爆炸毁伤的影响规律,可供防护工程设计时参考。

Numerical Analysis of Explosion Effect of Hit Angle on Cave Entrance of Protective Structures

In order to investigate the influence of blast loading on protective structure caused at different hit angles, a serial explosive simulations of straight wall arch are performed, and the waveforms of blast load and displacement respectively at the vault, the foot of arch and the bottom of straight wall are obtained. It is found that there is obvious influence of hit angle on load of protective structures. With the increase of hit angle, the peak vertical load at the vault reduces, and the peak horizontal load at the foot of arch increases; with the increase of hit angle, the peak vertical deformation at the vault reduces, and the peak horizontal deformation at the foot of arch increases. The results obtained through numerical analysis can been used for reference in the protective engineering design.