摘要
工程水泥基复合材料(engineered cementitious composite, ECC)是一种韧性强、抗拉能力突出、吸能效果显著的新型水泥基复合材料,具有良好的动态力学性能和冲击承载能力,在爆炸冲击防护领域具有较高的开发价值。为探究ECC抗爆加固性能,开展了6组砌体填充墙近距离爆炸试验,得到了多种工况下墙体损伤形态。结果表明,ECC涂层大幅提升了墙体的爆炸防护能力,有效抑制了墙体形变及损伤,避免了震塌碎块的产生及飞溅,具有良好的抗爆加固性能。通过对比墙体在不同涂覆方式、炸药量和涂层厚度条件下的损伤差异,分析了ECC涂层加固机理,并发现背爆面单面加固比双面加固更具效益比。在自定义ECC模型基础上,建立了分离式砌体墙有限元模型,并验证了材料模型和计算方法的可行性。通过模拟爆炸试验发现,在达到某一阈值前,增大涂层厚度及黏结强度,对提升ECC涂层抗爆加固效果作用明显。
Engineered cementitious composite(ECC)is a new type of cementitious composite material with high toughness,tensile strength,and energy absorption capacity.With its good dynamic mechanical properties and impact bearing capacity,ECC has shown great development value in the field of explosion impact protection.In order to explore the anti-explosion reinforcement performance of ECC,six groups of close-in explosion tests of masonry infilled walls were carried out,by which the damage patterns of walls under various working conditions were obtained.Results show that ECC coating has good anti-explosion reinforcement performance as it significantly improves the explosion protection ability of walls,effectively restrains the deformation and damage of walls,and eliminates the generation or splash of collapse fragments.By comparing the damage differences of walls under different coating modes,different explosive quantities and different coating thicknesses,the reinforcement mechanism of ECC coating was analyzed,and the analysis shows that the single-sided reinforcement on the back is more profitable than the double-sided reinforcement.Based on the customizing ECC material simulation model,the finite element model of a separated masonry wall was established,and the feasibility of the material model and the calculation method was verified.The simulation results show that before reaching a certain threshold,increasing the coating thickness or bonding strength has an obvious effect on improving anti-explosion reinforcement effect of ECC coating.
作者
杨谨鸿
李秀地
张波
陈昊
王起帆
尚敦敏
YANG Jinhong;LI Xiudi;ZHANG Bo;CHEN Hao;WANG Qifan;SHANG Dunmin(Department of Military Facility,Army Logistical College of PLA,Chongqing 401331,China;Department of Combat Engineering Support,Training Base of Army Engineering University of PLA,Xuzhou 221018,China)
出处
《振动与冲击》
EI
CSCD
北大核心
2023年第16期10-18,共9页
Journal of Vibration and Shock
基金
重庆市自然科学基金院士专项基金项目(csts2020yszx-jscxX0007)。
关键词
工程水泥基复合材料(ECC)
砌体填充墙
爆炸试验
抗爆加固
数值模拟
engineered cementitious composite(ECC)
masonry infilled wall
explosion test
anti-explosion reinforcement
numerical simulation
