基于SHPB试验的超高性能混凝土动力性能研究  

Experimental study on dynamic performance of UHPC based on SHPB

作　　者：胡利 李映春 唐梓棋 杨尚霖 HU Li;LI Yingchun;TANG Ziqi;YANG Shanglin(Defense Engineering Institute,AMS,PLA,Beijing 100850,China;South China University of Technology,Guangzhou 510006,China)

机构地区：[1]军事科学院国防工程研究院,北京100850 [2]华南理工大学,广东广州510006

出　　处：《防护工程》2023年第5期13-21,共9页Protective Engineering

摘　　要：为系统研究超高性能混凝土(UHPC)的动态压缩性能和动态拉伸性能,对UHPC进行了分离式霍普金森压杆(SHPB)试验。通过10组巴西劈裂试验和9组动态压缩试验得到了UHPC在中高应变率下的破坏模式和应力-应变关系曲线,分析了钢纤维掺量、应变率对UHPC动态拉伸、压缩强度和动态强度增强因子的影响规律。试验结果表明:钢纤维能有效阻碍裂缝发展、减少损伤,增强UHPC的动态抗拉、抗压性能;随着应变率的增大,UHPC的动态拉伸、压缩强度提升;钢纤维掺量增加可提高动态拉伸强度,钢纤维掺量超过1.0%后对动态压缩强度的提升不明显;UHPC的动态拉伸强度增强因子(TDIF)随应变率增大而逐渐增大,随着钢纤维掺量增加,UHPC的动态拉伸强度增强因子(TDIF)和动态压缩强度增强因子(CDIF)逐渐减小。To systematically investigate the dynamic compressive and tensile properties of ultra-high-performance concrete(UHPC),split Hopkinson pressure bar(SHPB)tests were conducted on UHPC.A series of Brazilian split tests and dynamic compression tests provided insights into the failure modes and stress-strain relationship curves of UHPC under medium to high strain rates.The impact of steel fiber content and strain rate on UHPC’s dynamic tensile and compressive strength and dynamic enhancement factors were analyzed.The experimental results reveal that steel fibers effectively inhibit crack propagation,reduce damage,as well as enhancing the dynamic tensile and compressive performance of UHPC.With increasing strain rates,UHPC’s dynamic tensile and compressive strength improve.An increase in steel fiber content can enhance dynamic tensile strength,with the improvement in dynamic compressive strength becoming less significant after a steel fiber content of 1.0%.The tensile dynamic increasement factor(TDIF)of UHPC gradually increases with higher strain rates.Furthermore,the TDIF and the compressive dynamic increasement factor(CDIF)decrease as steel fiber content increases.

关 键 词：超高性能混凝土 动态拉伸性能 动态压缩性能 破坏模式 动态强度增强因子 

分 类 号：TU528[建筑科学—建筑技术科学]