To examine how different compositions and shapes of steel fibers influence the mechanical responses and damage behavior of ultra-high performance concrete (UHPC), several axial compression tests are performed. The impact of steel fiber on acoustic emission (AE) parameters of UHPC is studied based on the AE technology. The variation law of AE parameters during damage evolution is qualitatively analyzed. According to the development trend of AE energy and cumulative energy, the damage level of specimens is quantitatively investigated. The damage constitutive equation of UHPC is established based on the AE energy. The results show that steel fiber is beneficial to the strength and ductility of UHPC. The development trend of AE accumulative ringing count and accumulative energy show a similar growth rule with strain and have a good correspondence with the stress-strain curve. The damage evolution model based on AE energy and accumulative energy fits well with the test data, which can quantitatively analyze the damage level of UHPC under axial compression.
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