摘要
为了评估地下结构的地震后抗爆炸能力,以边墙高3.0 m、半径3.0 m的半圆拱结构为模拟对象,假定了7种裂缝可能出现的位置。采用网格划分软件True Grid构建网格模型,基于LS-DYNA数值模拟分析地下拱结构在1条裂缝、2条裂缝和3条裂缝条件下的抗爆炸能力。分析结果表明:1条裂缝存在的条件下,地下拱结构的抗爆炸能力平均下降50%以上,裂缝的位置对地下拱结构的抗爆炸能力有明显影响,底板与边墙连接处的裂缝影响最大,拱顶正中的竖向裂缝影响最小;多条裂缝条件下的抗爆炸能力与单一裂缝相比没有明显区别,其抗爆炸能力的大小与各条裂缝单独存在时的最小抗爆炸能力相等。
The evaluation of anti-blasting ability of underground structures has become a new research subject since earthquake can seriously damage the underground structures. A semicircular arch structure with radius of arch of 3. 0 m and height of side wall of 3. 0 m is simulated,and seven kinds of cracks at different locations are presumed. True Grid is used to construct a mesh model,and then the anti-blasting ability of underground arch structure is numerically simulated by LS-DYNA. The results show that the anti-blasting ability of underground arch structure with a crack is dropped by more than 50%. The antiblasting ability of underground arch structure is affected by the location of cracks. The cracks between floor and side wall have the greatest effects on its anti-blasting ability and the cracks in arch crown have the least effects on its anti-blasting ability. The anti-blasting ability of arch structure with multi-cracks is not obviously different to that of arch structure with a single crack,and the anti-blasting ability is equal to the least value of anti-blasting ability when the cracks exist singly.
出处
《兵工学报》
EI
CAS
CSCD
北大核心
2017年第9期1736-1744,共9页
Acta Armamentarii
基金
国家自然科学青年基金项目(51308544)
解放军理工大学预先研究基金项目(KYDXZLXY1301)
关键词
爆炸力学
地震
地下结构
数值模拟
explosion mechanics
earthquake
underground structure
numerical simulation
