Shear performance of basalt fiber-reinforced concrete beams reinforced with BFRP bars
الملخص
This paper reports on the experimental and analytical investigation of the shear performance of concrete beams
cast with basalt fiber-reinforced concrete (BFRC) and longitudinally reinforced with basalt fiber-reinforced
polymer (BFRP) bars. Fourteen hybrid (BFRC-BFRP) beams with no stirrups were tested to failure under a
four-point loading setup. The investigated parameters included the volume fraction, Vf, of the added fibers (0.75
and 1.5%), the reinforcement ratio of the BFRP bars,ρ, (0.31, 0.48, 0.69, 1.05, and 1.52%), and the shear span-todepth ratios, a/d, of the beams (3.3 and 2.5 for slender and short beams, respectively). The tests results showed
that adding 0.75% of basalt macrofibres (BMF) improved the shear capacity of the slender and short beams by 46
and 43 %, respectively, compared to 81 and 82% when 1.5% of BMF were added. The impact of adding the BMF
on the shear strength of the beams diminished as the longitudinal reinforcement ratios increased. The existing
models overestimated the shear strength of the tested beams with an average predicted-to-experimental ratio
ranging between 1.15 ± 0.03 and 2.48 ± 0.29. A shear model that accounts for the type of the longitudinal
reinforcement and the added fibers was proposed to predict the shear strength of the BFRC-BFRP beams. A good
agreement between the predicted and experimental shear strength was evident with a predicted-to-experimental
ratio that ranged between 0.98 ± 0.11 and 0.88 ± 0.02 for the slender and short beams, respectively.
المجموعات
- الهندسة المدنية والمعمارية [769 items ]