Dynamic behavior and vulnerability analyses of steel-concrete&nbsp;composite beam bridge deck under rockfall impact#br#

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Journal of Vibration and Shock ›› 2025, Vol. 44 ›› Issue (1) : 177-189.

SHOCK AND EXPLOSION

Dynamic behavior and vulnerability analyses of steel-concrete composite beam bridge deck under rockfall impact#br#

WU Hao1, YANG Linke1, PENG Qi*2

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Abstract

Considering the threat of rockfall impacting superstructure of steel-concrete composite beam bridges in mountainous areas, both the dynamic behavior and vulnerability analysis of bridge panel under rockfall impact were performed. Firstly, based on existing impact test, the numerical simulation approach adopted to rockfall impact bridge panel was proposed and validated. Secondly, the refined finite element (FE) model of a prototype steel-concrete composite beam bridge panel subjected to rockfall impact was established, and the damage evolution process, failure mode and dynamic response of the bridge panel and shear nails were analyzed. Furthermore, the sensitivity and influence tendency of designed parameters of the bridge panel, i.e., concrete strength, yield strength, diameter and ratio of longitudinal reinforcement, transverse reinforcement ratio and stirrup reinforcement ratio, on the impact resistance performance were discussed. Finally, taking into account the randomness of geometry and material characteristics of bridge panel and impact load of rockfall, the vulnerability analysis of bridge panel was conducted based on response surface method and Monte Carlo simulation. The results indicate that improving the concrete strength and reinforcement ratio can effectively enhance the resistance of bridge panel against 400kJ energy level rockfall impact; for the considered impact scenario, in case of the impact velocity between 10~25m/s, the ratio of peak deflection to thickness at the mid span of the bridge panel is less than 0.75.

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rockfall impact / steel-concrete composite beam bridge / bridge panel / dynamic behavior / vulnerability analysis

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WU Hao1, YANG Linke1, PENG Qi2. Dynamic behavior and vulnerability analyses of steel-concrete composite beam bridge deck under rockfall impact#br#[J]. Journal of Vibration and Shock, 2025, 44(1): 177-189

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