落石冲击下钢混组合梁桥桥面板动力行为及易损性分析

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振动与冲击 ›› 2025, Vol. 44 ›› Issue (1) : 177-189.

冲击与爆炸

落石冲击下钢混组合梁桥桥面板动力行为及易损性分析

吴昊1，杨琳珂1，彭琦*2

作者信息 +

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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文章历史 +

摘要

针对山区钢混组合梁桥上部结构面临落石冲击的威胁，开展了钢混组合梁桥桥面板动力行为及易损性分析。首先，基于已有冲击试验，提出并验证了适用于落石冲击桥面板的数值仿真分析方法。其次，建立了落石冲击某原型钢混组合梁桥桥面板的精细化有限元模型，分析了桥面板和剪力钉的损伤演化过程、破坏模式和动力响应。进一步，讨论了混凝土强度、纵筋屈服强度、直径和配筋率、横筋配筋率以及配箍率等设计参数对桥面板抗落石冲击性能的敏感性和影响规律。最后，综合考虑桥面板几何与材料特性以及落石冲击荷载的随机性，基于响应面法和蒙特卡罗模拟开展了桥面板的易损性分析。结果表明：提高混凝土强度及配筋率，可有效地增强桥面板抵抗400kJ能级落石冲击的性能；对于所考虑工况，当落石速度在10~25m/s时，桥面板跨中峰值挠度与板厚比值低于0.75。

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.

导出引用

吴昊1, 杨琳珂1, 彭琦2. 落石冲击下钢混组合梁桥桥面板动力行为及易损性分析[J]. 振动与冲击, 2025, 44(1): 177-189

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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