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Experimental and numerical study on the effect of fibers on shear strength of basalt FRP-reinforced concrete beams without stirrup
The relatively low shear strength, low ductility, and weak post-cracking performance of FRP-reinforced concrete (RC) members caused by low elastic modulus and low transverse strength of FRP rebars can be significantly improved through the use of fiber concrete; this issue has not been extensively investigated yet, therefore, this investigation was motivated. This study presents the experimental and numerical analysis of basalt FRP-RC members with different types of fiber and without shear reinforcement. Seven beams with the same geometry, flexural reinforcement ratio, and shear span-to-depth ratio were cast and tested under four-point loading to fail in shear. The test variables are the type of fiber (hooked steel fiber, smooth steel fiber, and polypropylene fiber) and fiber volume fraction (0.75% and 1.5%). The experimental results indicate that the inclusion of fibers significantly improves the crack pattern, ductility, post-cracking shear resistance, and ultimate shear strength; hence, it is alleviated, either partially or completely, the reduction in ductility and shear strength caused by using FRP bars as a substitute to steel bars. The presence of fibers with ratios of 0.75% and 1.5% increased the ratio of shear strength with respect to the reference beam to about 1.55 and 1.93, 1.51 and 1.68, and 1.37 and 1.46 for Steel fiber type-1, steel fiber type-2, and polypropene fiber, respectively. Finally, the standardized finite-element simulation for beams with various types and volume ratios showed an influential capability in pretending the tested beams regarding the failure load, load–deflection relationship, and crack pattern.
Experimental and numerical study on the effect of fibers on shear strength of basalt FRP-reinforced concrete beams without stirrup
The relatively low shear strength, low ductility, and weak post-cracking performance of FRP-reinforced concrete (RC) members caused by low elastic modulus and low transverse strength of FRP rebars can be significantly improved through the use of fiber concrete; this issue has not been extensively investigated yet, therefore, this investigation was motivated. This study presents the experimental and numerical analysis of basalt FRP-RC members with different types of fiber and without shear reinforcement. Seven beams with the same geometry, flexural reinforcement ratio, and shear span-to-depth ratio were cast and tested under four-point loading to fail in shear. The test variables are the type of fiber (hooked steel fiber, smooth steel fiber, and polypropylene fiber) and fiber volume fraction (0.75% and 1.5%). The experimental results indicate that the inclusion of fibers significantly improves the crack pattern, ductility, post-cracking shear resistance, and ultimate shear strength; hence, it is alleviated, either partially or completely, the reduction in ductility and shear strength caused by using FRP bars as a substitute to steel bars. The presence of fibers with ratios of 0.75% and 1.5% increased the ratio of shear strength with respect to the reference beam to about 1.55 and 1.93, 1.51 and 1.68, and 1.37 and 1.46 for Steel fiber type-1, steel fiber type-2, and polypropene fiber, respectively. Finally, the standardized finite-element simulation for beams with various types and volume ratios showed an influential capability in pretending the tested beams regarding the failure load, load–deflection relationship, and crack pattern.
Experimental and numerical study on the effect of fibers on shear strength of basalt FRP-reinforced concrete beams without stirrup
Asian J Civ Eng
Jumaa, Ghazi Bahroz (author)
Asian Journal of Civil Engineering ; 24 ; 1817-1829
2023-09-01
13 pages
Article (Journal)
Electronic Resource
English
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