纳米改性超高性能混凝土板在爆炸荷载下的动态响应试验研究  

Experimental Study on Dynamic Response of Nano-modified Ultra-high Performance Concrete Slabs Under Explosion Loads

作　　者：李少杰 张云峰 张玉令 闫军 杜仕国 陈博[2] LI Shaojie;ZHANG Yunfeng;ZHANG Yuling;YAN Jun;DU Shiguo;CHEN Bo(Department of Ammunition Engineering,Army Engineering University,Shijiazhuang 050000,China;Northwest Institute of Nuclear Technology,Xi’an 710000,China;Department of Road and Bridge Engineering,Hebei Jiaotong Vocational and Technical College,Shijiazhuang 050000,China)

机构地区：[1]陆军工程大学弹药工程系,石家庄050000 [2]西北核技术研究所,西安710000 [3]河北交通职业技术学院路桥工程系,石家庄050000

出　　处：《材料导报》2024年第11期88-96,共9页Materials Reports

基　　金：河北省军民融合科技创新项目(SJMYF2022Y22)。

摘　　要：为探究纳米改性超高性能混凝土板(UHPC)在爆炸荷载下的动态力学响应,设计了系列UHPC靶板并对其进行近场爆炸冲击试验,采用动态测试系统和相关传感器采集响应信号,对靶板在受载下的位移、应变、加速度等关键力学参数进行研究分析。结果表明,两次爆炸冲击下系列UHPC板的抗爆抗冲击性能均显著优于普通高强混凝土板,同时掺有钢纤维和碳纳米管(CNTs)的UHPC板(SF0.5CNT-UHPC、SF1.0CNT-UHPC)具有良好的抗变形能力和结构稳定性。随钢纤维含量的增加,UHPC板的应变峰值、加速度峰值和跨中最大挠度均明显减小,相应损伤程度减轻。使用等效单自由度分析从理论上计算了SF0.5CNT-UHPC、SF1.0CNT-UHPC板在弹性阶段的位移响应,发现跨中最大挠度的理论计算结果与实测值较为接近,两靶板误差分别为13.5%、8.7%。CNTs和钢纤维通过抑制不同尺度的缺陷显著提升了UHPC的强度、刚度和抗裂性,对UHPC表现出协同强化作用。In order to investigate the dynamic response of nano-modified ultra-high performance concrete (UHPC) slabs under explosion loads,a series of UHPC targets were designed and subjected to close-in explosion impacts.The key mechanical parameters of the targets under explosion loads were studied and analyzed by using the dynamic test system and relevant sensors to collect signals,such as displacement,strain and acce- leration .The results show that the anti-explosion performance of series UHPC slabs under two explosion impacts is significantly better than that of ordinary high-strength concrete.The UHPC slabs reinforced by both steel fibers (SF) and carbon nanotubes (CNTs) (i.e.,SF0.5CNT-UHPC and SF1.0CNT-UHPC) show excellent deformation resistance ability and structural stability.With the increase of SF content,the maximum mid span deflections,strain peaks and acceleration peaks of UHPC slabs significantly decrease,and the corresponding damage degrees reduce.The elastic displacement response of SF0.5CNT-UHPC and SF1.0CNT-UHPC slabs are theoretically calculated by using the equivalent single-degree-of-freedom analysis.The theoretical calculation results of the maximum deflection at the midspan are close to the measured values,and the errors of the above two slabs are 13.5% and 8.7%,respectively.It is concluded CNTs and steel fibers significantly improve the strength,stiffness and crack resistance of UHPC by suppressing the defects at different scales,which display synergistic reinforcement effects on UHPC.

关 键 词：超高性能混凝土 碳纳米管 钢纤维 爆炸冲击 动态响应 

分 类 号：TJ55[兵器科学与技术—军事化学与烟火技术] O383[理学—流体力学]