Energy dissipation characteristics of concrete slabs under low-speed impact

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Journal of Vibration and Shock ›› 2025, Vol. 44 ›› Issue (15) : 280-288.

SHOCK AND EXPLOSION

Energy dissipation characteristics of concrete slabs under low-speed impact

YAN Jiawei, GU Song*, KONG Chao

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Abstract

In order to investigate the energy dissipation characteristics of concrete slabs under low-velocity impact, 14 groups of plain concrete slabs were tested by using a drop hammer test device. The impact process of each group was numerically simulated by using the Continuous Surface Cap Model (CSCM) combined with the nonlinear display dynamic analysis software LS-DYNA. The energy change of the specimen during the impact process was found through the law of conservation of energy. The effects of different concrete strengths, impact velocities and concrete slab thicknesses on the energy dissipation characteristics of concrete slabs and their destructive effects were analysed. The results show that the impact force increases with the increase of the impact velocity of the drop hammer. The dynamic change process of the concrete slab during the low-velocity impact is mainly divided into the elastic stage, the plastic stage and the complete destruction stage. The downward deflection of the concrete slab increases with increasing impact velocity, showing a better parabolic relationship. When the impact velocity is higher, it will show a stronger erosion effect. The more energy consumed by the kinetic energy of the concrete fragments and the kinetic energy of the drop hammer during the fracture process, the less energy is applied to the crack expansion. This study can provide a reference for bridge deck slabs and pavements to prevent low-velocity impact effects for the design of rockfall hazard protection projects.

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low-speed / impact test / energy dissipation / damage effect / break energy

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YAN Jiawei, GU Song, KONG Chao. Energy dissipation characteristics of concrete slabs under low-speed impact[J]. Journal of Vibration and Shock, 2025, 44(15): 280-288

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