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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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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.然后,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洛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400 kJ能级落石冲击的性能;对于所考虑工况,当落石速度在10~25 m/s时,桥面板跨中峰值挠度与板厚比值低于0.75.
Dynamic behavior and vulnerability analyses of steel-concrete composite beam bridge deck under rockfall impact
Here,aiming at threats of rockfall impact on upper structure of steel-concrete composite beam bridges in mountain areas,both dynamic behavior and vulnerability analyses of steel-concrete composite beam bridge deck were performed.Firstly,based on existing impact tests,a numerical simulation analysis method suitable for rockfall impacting bridge deck was proposed and verified.Secondly,a refined finite element model of a prototype steel-concrete composite beam bridge deck subjected to rockfall impact was established,and damage evolution processes,failure modes and dynamic responses of bridge deck and shear nail were analyzed.Furthermore,the sensitivity and influence laws of design parameters of concrete strength,longitudinal reinforcement yield strength,diameter and reinforcement ratio,transverse reinforcement ratio and stirrup ratio on the anti-rockfall impact performance of bridge deck were discussed.Finally,comprehensively considering geometric and material properties of bridge deck as well as the randomness of rockfall impact load,the vulnerability analysis of bridge deck was performed based on response surface method and Monte Carlo simulation.The results showed that increasing strength and reinforcement ratio of concrete can effectively enhance the performance of bridge deck to resist 400 kJ energy level rockfall impact;for the considered operating conditions,when rockfall velocity is 10-25 m/s,the ratio of peak deflection at mid span of bridge deck to deck thickness is less than 0.75.

rockfall impactsteel-concrete composite beam bridgebridge deckdynamic behaviorvulnerability analysis

吴昊、杨琳珂、彭琦

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同济大学土木工程学院,上海 200092

长沙理工大学土木工程学院,长沙 410114

落石冲击 钢混组合梁桥 桥面板 动力行为 易损性分析

2025

振动与冲击
中国振动工程学会 上海交通大学 上海市振动工程学会

振动与冲击

北大核心
影响因子:0.898
ISSN:1000-3835
年,卷(期):2025.44(1)