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Experimental and theoretical study on the shear behavior of CFRP bar‑reinforced UHPFRC beams considering orientation and volume fraction of steel fibers

Liang Longming, Ke Lu, Feng Zheng, Li Chuanxi, Yan Banfu, Guo Jia

Archives of Civil and Mechanical Engineering

2024

Vol. 24, no. 1

art. no. e1, 2024

This paper aims to comprehensively understand the shear behavior of fiber-reinforced polymer (CFRP) bars reinforced ultra-high-performance fiber-reinforced concrete (UHPFRC) beams, and develop a calculation model to predict the shear capacity. The crucial parameters under consideration are the orientation and volume fraction of steel fibers. A magnetic field fiber orientation setup was utilized to achieve the desired orientation. The results indicated that all UHPFRC beams demonstrated shear failure, showing clear instances of both beam action and arch action throughout the failure progression. By orienting the steel fibers at an angle of 60° relative to the longitudinal axis of the beams, the average shear capacity increases by 23.51% compared to that of the beams with random distributed steel fibers because the steel fibers are almost perpendicular to the diagonal shear cracks. Increasing the fiber volume fraction from 1.5% to 2.0% led to a significant maximum increase in the average shear capacity, reaching 31.73%. Moreover, the larger orientation angles and higher volume fraction of steel fibers contributed to improved ductility, reaching a maximum of 124.0%. Finally, a highly accurate model based on the fiber-matrix discrete approach was formulated. The proposed model showed a slight overestimation of shear capacity, with most values not exceeding 10%, and a standard deviation below 6.22%.