Numerical simulation on the impact resistance of RC columns protected by PU foam under impact load

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Journal of Vibration and Shock ›› 2025, Vol. 44 ›› Issue (14) : 120-131.

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Numerical simulation on the impact resistance of RC columns protected by PU foam under impact load

HE Qingfeng*，ZHANG Junfeng，YI Fan，TANG Zhilong

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Abstract

The cushioning foam structure protection measures exhibit excellent protective effects. To investigate the energy dissipation effect and impact resistance mechanism of the reinforced concrete (RC) columns designed for protection during collisions，This paper is based on the pendulum impact test data, numerical simulations are conducted using LS-DYNA to analyze the dynamic response and failure modes of reinforced concrete (RC) columns under impact loading, and the effectiveness of the numerical model is validated. The study investigates the impact resistance of RC columns with three different protective measures: unprotected, polyurethane (PU) foam protection, and a composite protection using wire mesh and mortar. The results indicate that both protective measures significantly enhance the impact performance of the RC columns. Under pendulum impact loading, the wire mesh-mortar composite with PU foam demonstrates excellent impact resistance. Specifically, compared to PU foam protection alone, incorporating wire mesh with composite mortar on the outer layer of PU foam reduces the peak impact force and displacement by approximately 20% and 25%, respectively, at the same protective thickness. The columns demonstrate enhanced impact resistance at various impact velocities, and increasing the thickness and density of the cushioning layer effectively improves the impact resistance of the RC columns.

Key words

pendulum impact test / polyurethane foam / protective measure / impact resistance / energy dissipation

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HE Qingfeng, ZHANG Junfeng, YI Fan, TANG Zhilong. Numerical simulation on the impact resistance of RC columns protected by PU foam under impact load[J]. Journal of Vibration and Shock, 2025, 44(14): 120-131

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