内爆炸下球面钢网壳结构的冲击波超压计算分析

Analysis for Shock Wave Overpressure of Spherical Steel Reticulated Shell under Internal Explosion

采用通用有限元LS-DYNA程序,建立内爆炸下大跨球面钢网壳结构数值模拟计算模型,用于大跨空间结构的内爆炸数值模拟计算和分析.通过研究大跨球面钢网壳结构在内爆炸下的冲击波传播、反射和峰值出现规律,发现炸药在结构内爆炸下,球面钢网壳结构受到的爆炸冲击效应更为复杂,可能需要同时承受入射冲击波和反射波或复合波的冲击作用.最后,应用所建模型对爆炸冲击波超压的数值进行计算分析,得出内爆炸下不同跨度和矢跨比大跨球面网壳结构的冲击波超压计算公式.

Using LS-DYNA FEM software, a numerical model simulating internal blast in the large-space spherical steel reticulated shell was established for the numerical simulation of the explosion inside the shells. Investigating the propaga- tion, reflection and overpressure peak of the shock waves within the large-space spherical steel reticulated shell under in- ternal blast, it is found that the shock effects to the spherical steel reticulated shell are complicated and that the reticulated shell may be simultaneously subjected to the impact of incident shock waves and reflected waves or combination waves un- der the internal explosion. Based on the results of the explosive shock wave overpressure by the numerical model, the for mulae for shock wave overpressure of the large-space spherical reticulated shell with the different spans and height-to-span ratios under internal explosion are obtained.