大跨度被覆结构爆炸荷载分布规律研究

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Distribution Rule of Blast Loads on Large-span Compound Structure

1. Engineering Institute of Engineering Crops, PLA Univ. of Sci. & Tech., Nanjing Jiangsu 210007;
2. Unit 94968, PLA, Nanjing Jiangsu 211100;
3. Unit 94857, PLA, Wuhu Anhui 241007 China

摘要: 为确定常规武器岩土介质中爆炸应力波作用在大跨度(20 m以上)被覆结构上荷载分布,利用LS-DYNA有限元程序具体针对不同工况进行数值模拟,得出不同爆距H和爆炸偏角α下几种典型跨度拱壳结构上荷载大小变化和分布情况。计算表明,拱壳结构上荷载随时间推移逐渐由拱顶向两侧扩散衰减;荷载作用范围随结构跨度的增大而减小,当跨度达到50 m时,荷载作用范围不再减小;不同爆炸偏角下,荷载分布只是随爆源相对结构偏角位置的变化而偏移,而分布形式一致。
- 爆炸荷载 /
- 大跨度 /
- 荷载分布 /
- 数值模拟
Abstract: In order to analyze the distribution of the load on the large-span compound structure in rock and soil under explosion, by applying LS-DYNA program to simulate different operation conditions, the variety and the distribution of the load is gotten on some typical span arch shell structures. The result shows that the load on the arch shell structures attenuates from vault to two sides as time goes by; the load's acceptance range minishes as the structure span increases until it reaches 50m, the distribution of the load offsets as deflection angle of the explosion source to the structures changes with the same distribution form.
- blast loads /
- large span /
- load distribution /
- numerical simulation