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In this study, repeated compression tests were conducted for ultra-high-performance fiber reinforced concrete (UHPFRC) under three different impact pressures. Results showed that as the impact number increased, the strain rate approximately showed a proportional increase, and the plateau region of the dynamic stress-strain curve became more prominent. Besides, when the repeated impacts increased, the maximum strain and dynamic toughness both exhibited upward trends, while the peak stress decreased. The average toughness was positively correlated with the strain rate. Additionally, under high repeated impact loads, a single crack propagated rapidly within the UHPFRC specimen after single impact. Conversely, cracks propagated from the center to the periphery on the surface of the specimen when repeated loads were low. Furthermore, a quantitative evaluation method for the damage of UHPFRC under repeated impact loads was proposed based on the characteristic parameters of the gray-level co-occurrence matrix (GLCM). The plateau region appeared in the dynamic stress-strain curves of UHPFRC.Dynamic responses of UHPFRC showed a three-stage tendency under low-impact loads.As the strain rate increased, the dynamic failure patterns of UHPFRC changed.A novel damage evaluation method was developed for UHPFRC under repeated impact loads.
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FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
ISSN: 8756-758X
Year: 2023
Issue: 11
Volume: 46
Page: 4299-4314
3 . 1
JCR@2023
3 . 1 0 0
JCR@2023
JCR Journal Grade:2
CAS Journal Grade:2
Cited Count:
SCOPUS Cited Count: 1
ESI Highly Cited Papers on the List: 0 Unfold All
WanFang Cited Count:
Chinese Cited Count:
30 Days PV: 2
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