仵鹏涛¹, 刘中宪², 吴成清², 张海³, 徐慎春¹, 苏宇²
AuthorsHTML:仵鹏涛¹, 刘中宪², 吴成清², 张海³, 徐慎春¹, 苏宇²
AuthorsListE:Wu Pengtao¹, Liu Zhongxian², Wu Chengqing², Zhang Hai³, Xu Shenchun¹, Su Yu²
AuthorsHTMLE:Wu Pengtao¹, Liu Zhongxian², Wu Chengqing², Zhang Hai³, Xu Shenchun¹, Su Yu²
Unit:1. 天津大学建筑工程学院，天津 300072；2. 天津城建大学天津市建筑结构防护与加固重点实验室，天津300384；3. 天津市软土特性与工程环境重点实验室，天津 300384
Unit_EngLish:1．School of Civil Engineering, Tianjin University, Tianjin 300072, China
2．Tianjin Key Laboratory of Civil Structure Protection and Reinforcement, Tianjin Chengjian University, Tianjin 300384, China
3．Tianjin Key Laboratory of Soft Soil Characteristics and Engineering Environment, Tianjin 300384, China
Abstract_Chinese:采用杆径为75 mm的分离式霍普金斯杆试验机和YAW-3000电液伺服压力试验机分别对5组不同配合比超高性能混凝土(UHPC)进行了动力压缩试验和静力压缩试验, 详细分析了不同类型钢纤维和不同钢纤维掺量对超高性能混凝土动态抗压强度的影响．通过计算得出不同配合比的动态增长因子, 绘制出超高性能混凝土动态增长因子曲线．结果表明：超高性能混凝土动态强度、峰值应变均随应变率的增大而增加; 不同钢纤维类型和掺量对超高性能混凝土的动态抗压性能影响显著, 但对其动态增长因子影响较小; 同时, 也清晰地观察到大长径比钢纤维对超高性能混凝土动态强度增强效果更好．
Abstract_English:The dynamic and static compressive experiments on ultra-high performance concrete(UHPC)were carried out，including five sets of specimens with different mixtures，by utilizing the 75 mm split Hopkinson pressure bar (SHPB) system and the YAW-3000 electro-hydraulic servo testing machine，respectively. The effects of types and volume ratios of steel fibers on dynamic compressive strength were analyzed in detail. The dynamic increase factors of UHPC for different mixtures were calculated and the diagram of dynamic increase factors was further obtained. The results indicate that the dynamic compressive strength and peak strain of the UHPC increase significantly with the increase of strain rates; the types and volume ratios of steel fibers have great effect on the dynamic properties of the UHPC but little effect on the dynamic increase factor; a better improvement effect of fibers with greater length-diameter ratios on the dynamic compressive strength of the UHPC was also clearly observed.
Keyword_Chinese:超高性能混凝土; 钢纤维; 动态力学性能; 分离式霍普金森压杆; 应变率效应
Keywords_English:ultra-high performance concrete; steelfibers; dynamic mechanical properties; split Hopkinson pressure bar; strain rate effect

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