Dynamic characteristics and fracture energy dissipation of fiber reinforced concrete beams under low-velocity impact

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Journal of Vibration and Shock ›› 2022, Vol. 41 ›› Issue (8) : 208-216.

MA Gang1,GAO Songtao1,WANG Zhuoran2,MA Zhihong2

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Abstract

With the reduction of the production cost of various types of chopped fiber, fiber reinforced concrete has been developed on a large scale and its application fields are expanding. In order to ensure the service safety of fiber reinforced concrete in complex environment, this paper analyzes the concrete beam and carbon fiber (CF) with the fiber length of 6-8 mm and the volume content of 0.30% The low velocity impact tests of glass fiber (GF) and basalt fiber (BF) concrete beams were carried out to study the bending failure mechanism and fracture energy consumption of ordinary concrete beams and fiber reinforced concrete beams. The fracture process of each beam was recorded by high-speed camera, and the vertical displacement time history curve, acceleration time history curve and tension compression strain time history curve were extracted and analyzed. The impact force and inertia force of hammerhead were analyzed in detail, and the equivalent deformation force displacement curve was obtained, and the fracture energy consumption of each fiber reinforced concrete beam was calculated. The results show that the failure mode of each specimen is typical bending failure, and a vertical main crack is formed. The energy consumption of GFRC beam is the most, which is 88% higher than that of （plain concrete）PC beam. The energy consumption of CFRC beam and BFRC beam is 43% and 18% higher than that of PC beam, respectively. In this paper, the quantitative research results of mechanical properties and energy consumption of different types of fiber reinforced concrete flexural members under low velocity impact condition can provide reference for the engineering application of fiber reinforced concrete.

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Fiber reinforced concrete beam / low speed impact / inertia force / fracture energy dissipation

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MA Gang1,GAO Songtao1,WANG Zhuoran2,MA Zhihong2. Dynamic characteristics and fracture energy dissipation of fiber reinforced concrete beams under low-velocity impact[J]. Journal of Vibration and Shock, 2022, 41(8): 208-216

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