东南大学学报（自然科学版）2025，Vol.55Issue(5)：1363-1372,10.DOI:10.3969/j.issn.1001-0505.2025.05.017
考虑车-桥耦合系统激励随机性影响的大跨度悬索桥竖向涡振限值研究
Study on allowable magnitude of vertical vortex-induced vibration for long-span suspension bridges considering excitation randomness effects of coupled vehicle-bridge system
摘要
Abstract
Vortex-induced vibration(VIV)in long-span railway bridges can affect both driving safety and ride comfort.Firstly,the coupled vibration analysis model of a vehicle-bridge system considering the influence of VIV is presented.Then,based on the energy proportion of the track irregularity power spectrum,the random dimension is virtually reduced.The optimized iterative screening-rearrangement method(IS-RAM)is applied for representative point selection.A surrogate model method for the response exceedance probability of the vehicle-bridge system based on the response surface and polynomial chaos is proposed to realize the decou-pling of variables in stochastic systems.The analysis steps for determining the allowable magnitude of VIV considering random excitation effects are provided,and the accuracy of the surrogate model method is veri-fied.Finally,a case study of a long-span suspension bridge is presented to investigate the allowable magnitude of VIV considering random excitation effects.The effects of the exceedance probability level,vibration mode,train speed are analyzed.The results show that based on the energy proportion,the dimension of select-ing representative random numbers can be reduced by about 10 times.The surrogate model method can signifi-cantly reduce the analysis sample size.As the exceedance probability level decreases and the VIV order in-creases,the selection of the allowable magnitude of VIV becomes more stringent,and the allowable magni-tude of VIV considering random excitation effects is more reasonable.关键词
车-桥系统/涡振/随机激励/涡振限值/代理模型Key words
vehicle-bridge system/vortex-induced vibration/random excitation/allowable magnitude of vortex-induced vibration/surrogate model分类
交通工程引用本文复制引用
向活跃,陈虹宇,田祥富,李永乐..考虑车-桥耦合系统激励随机性影响的大跨度悬索桥竖向涡振限值研究[J].东南大学学报（自然科学版）,2025,55(5):1363-1372,10.基金项目
国家自然科学基金资助项目(52322811,52388102). （52322811,52388102）
