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| Tests for failure mode of RC notched beam under impact load |
| SONG Min1, WANG Zhiyong1, ZHANG Jie1, GAO Shiwu2, WANG Zhihua1 |
1. Institute of Applied Mechanics, College of Mechanical and Vehicle Engineering, Taiyuan University of Technology, Taiyuan 030024, China;
2. College of Civil Engineering, Qinghai University, Xining 810016, China |
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Abstract During the service period of reinforced concrete beam, the micro cracks and defects in the beam derive and extend gradually, which result in the cracking in concrete. Under impact loads, compared with the RC beams without cracks, the bearing capacity and energy dissipation of notched RC beams present significant difference. In order to investigate the impact resistance of notched reinforced concrete beams, the dynamic three point bending tests for notched beams with different reinforcement ratio were conducted with a falling-weight impact machine. Reinforcement ratio and impact velocity were taken as variables. The impact force between hammer head and specimen, reaction force from supports and mid-span deflection were measured and analyzed. And then the influence of impact velocities on failure pattern, bearing capacity and absorbed energy were discussed. The experiment results presented that, with the increase of reinforcement ratio and impact velocities, the failure pattern of notched reinforced concrete beams changed from bending failure to bending-shear failure. Furthermore, the ratio of maximum reaction force to static bending capacity increased linearly with the increase of impact velocities when the bending failure occurred, and the same linear relationship between maximum reaction force and static shear capacity for bending-shear failure pattern reinforced beam was also obtained. The shape of the hysteretic loop between reaction force and mid-span deflection could be assumed to be parallelogram, and then an empirical formula of static bending capacity about impact energy, residual deflection and impact velocities were established. Similarly, an empirical formula of static shear capacity about impact energy, impact velocities and maximum mid-span deflection was also presented. Based on the formulas, the impact resistance of notched reinforced concrete beams was evaluated reasonably.
Key words: notched RC beams, impact velocities, reinforcement ratio, failure pattern, bearing capacity, energy dissipation
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Received: 06 April 2021
Published: 15 July 2022
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