Fatigue life analysis of steel-polypropylene hybrid fiber reinforced concrete subjected to uniaxial constant-amplitude cyclic compression

被引：0
作者：
Cui K. [1 ]
Xu L. [1 ]
Chi Y. [1 ]
Li L. [1 ]
Li X. [1 ]
机构：
[1] Wuhan University, Wuhan
来源：
Tumu Gongcheng Xuebao/China Civil Engineering Journal | 2023年 / 56卷 / 09期
关键词：
fatigue equation; fatigue life; positive synergetic effect; steel⁃polypropylene hybrid fiber reinforced concrete; uniaxial constant⁃amplitude cyclic compression;
D O I：
10.15951/j.tmgcxb.22040376
中图分类号：
学科分类号：
摘要：
The fatigue life of steel⁃polypropylene hybrid fiber reinforced concrete (HFRC) subjected to uniaxial constant⁃amplitude cyclic compression was investigated. A total of 36 groups of prismatic specimens were tested for various stress levels and different fiber parameters that include steel fiber volume fractions and aspect ratios, as well as polypropylene fiber volume fractions and aspect ratios. Based on the measured fatigue test data, the whole process of HFRC under fatigue compression was analyzed, the effect of fiber parameters on the fatigue life of concrete specimens was probed, and the P⁃S⁃N fatigue equation was established with fiber parameters taken into consideration. The results showed that the failure mode of HFRC is shear failure, exhibiting its better ductility. In addition, the development of fatigue deformation for HFRC could be divided into three stages: rapid growth stage, stable development stage and fatigue failure stage. Hence, hybrid fiber is more superior to polypropylene fiber or steel fiber in prolonging the fatigue life of concrete, owing to a positive synergetic effect generated in the hybrid system. Finally, it was found that the proposed fatigue equation correlates well with available experimental results, demonstrating a good applicability in predicting the fatigue life of concrete with reasonable accuracy. This research outcome could provide a reference for life⁃ cycle design and performance control of HFRC structures. © 2023 Editorial Office of China Civil Engineering Journal. All rights reserved.
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页码：26 / 38
页数：12
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