中文摘要：

采用分离式Hopkinson杆,系统研究了4种不同钢纤维体积掺量（分别为0%,1.0%,1.5%和2.0%）的大掺量粉煤灰超高性能混凝土在多次冲击压缩作用下的动态力学行为和材料损伤劣化的全过程.结果表明：在多次冲击压缩荷载作用下,随着钢纤维的掺入及掺量的增加,超高性能混凝土抗动态破坏作用的能力明显增强;随着冲击次数的增加,超高性能钢纤维混凝土的损伤不断累积直至最后失效,呈现出裂而不散的破坏特征.

英文摘要：

The influence of steel fiber volume dosage on dynamic mechanical behavior of ultra-high performance steel fiber reinforced concrete mixed with high volume fly ash under multi-impact compression was investigated. Four volume dosage levels of 0%, 1.0%, 1.5% and 2.0% were evaluated and the dynamic mechanical behavior was performed on split Hopkinson pressure bar apparatus. Results have revealed that ultra-high performance concrete has better resistance to multi-impact compression with the increase of steel fiber volume dosage. Furthermore, with the increases in the number of impact cycles, ultra-high performance concrete goes through damage from cracking to failure, with the fracture feature of cracking instead of breaking.