作者：陈首¹, 石少卿¹, 肖颍杰¹, 余咏平¹, 李季²

作者单位：1. 中国人民解放军陆军勤务学院军事设施系，重庆 401331;
2. 军事科学院国防工程研究院，北京 100850

关键词：金属网增强混凝土;低速冲击;抗冲击性能;防护工程

摘要：

利用自制的模拟弹体冲击装置对不同类型金属网增强混凝土试件进行低速冲击试验，发现在素混凝土中加入金属网可以有效改善它的变形和破坏形态。此外，设置不同工况分析弹体冲击次数和金属网层数的变化对试件抗冲击性能的影响。结果表明：对于同一种试件，随着冲击次数的增加，试件的抗冲击性能在下降；在一定范围内增加金属网层数，可以显著提高试件的抗冲击性能；试验中，含有6层金属网试件的抗冲击性能较好，它能有效抵抗弹体3次以上的冲击作用，能承受7.65 kJ以上的冲击能量，且在受到弹体3次冲击后，其产生的弹坑尺寸较相同条件下含有2层和4层金属网的试件分别降低66.7%和47.6%，底面挠度分别降低69.9%和37.5%。最后，借助有限元分析软件LS-DYNA对冲击试验进行数值模拟，进一步完善试验结果。

Experimental and numerical study on low speed impact resistance of metal mesh reinforced concrete
CHEN Shou¹, SHI Shaoqing¹, XIAO Yingjie¹, YU Yongping¹, LI Ji²
1. Department of Military Facilities, Army Logistics University of PLA, Chongqing 401331, China;
2. Institute of Defense Engineering, AMS, PLA, Beijing 100850, China
Abstract: The low speed impact tests of different types of concrete specimens reinforced with metal meshes were carried out by using the selfmade simulated projectile impact devices. It was found that adding metal meshes to plain concrete can effectively improve its deformation and failure mode. In addition, different working conditions are set to analyze the influence of the numbers of impact and the layers of metal meshes on the impact resistance performance of the specimens. The results show that: for the same specimen, the impact resistance performance decreases with the increase of the numbers of impact. Increasing the layers of metal meshes within a certain range can significantly improve the impact resistance performance of the specimen. In this test, the impact resistance performance of the specimen containing six layers of metal meshes is better. It can effectively resist the impact of the projectile for more than three times and can withstand the impact energy of more than 7.65 kJ. After three times of impact of the projectile, the crater size of the specimen is 66.7% and 47.6% lower than that of the specimen containing two and four layers of metal meshes under the same conditions, and the deflection is 69.9% and 37.5% lower respectively. Finally, the impact test is simulated by the finite element analysis software LS-DYNA to further improve the test results.
Keywords: metal mesh reinforced concrete;low speed impact;impact resistance performance;protection engineering
2021, 47(4):136-143  收稿日期: 2020-11-18;收到修改稿日期: 2020-12-25
基金项目: 国防科技项目基金(CLJ19J019)；重庆市高校优秀成果转化资助项目(KJZH17138)
作者简介: 陈首（1993-），男，江苏盐城市人，博士，主要从事防灾减灾及防护工程研究
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