土木与环境工程学报（中英文）2025，Vol.47Issue(3)：190-200,11.DOI:10.11835/j.issn.2096-6717.2023.051
基于可靠度理论的中低速磁浮车-桥系统轨道梁动力系数研究
Study on dynamic factors of the guideway beam of low and medium speed maglev vehicle-bridge system based on reliability theory
摘要
Abstract
Affected by the randomness of track irregularity,the dynamic factor of the guideway beam caused by the maglev vehicle has obvious uncertainty.In order to accurately calculate the reliability of the dynamic factors of the guideway beam,a vertical coupling vibration model of the medium and low speed maglev train-bridge system was established,which was composed of the maglev vehicle,the simply supported girder and the suspension control system.Then,combined with the idea of orthogonal random function and the strategy of selecting points by the number theory method,the reduced-dimension simulation method of track irregularity was developed,which repaired only two random variables to simulate the representative samples of the track irregularity.Finally,based on the probability density evolution method and the equivalent extreme-value principle,a reliability evaluation method for the guideway beam was proposed,by which the probability density function,the cumulative distribution function of the dynamic system and the dynamic reliability of the guideway beam can be accurately obtained.The Changsha low-medium speed maglev line,as a case study,was numerically analyzed.The reliability of the calculation model was verified by comparing with the results of field measurement and Monte Carlo method.Furthermore,the effects of vehicle speed,vehicle weight and track irregularity roughness on the dynamic factors and the reliability of the guideway beam were discussed.The results indicate that the reliability of the guideway beam is 1 within the speed range of 60 to 140 km/h.The weight of vehicle has a small effect on the dynamic coefficient of the guideway beam,but the effect of the track irregularity roughness is significant.Overall,the Changsha low and medium speed maglev 25 m simply supported girder bridge has good dynamic performance and a large safety margin.关键词
中低速磁浮/车-桥耦合振动/概率密度演化理论/动力系数/可靠度Key words
low and medium speed maglev/vehicle-bridge coupled vibration/probability density evolution method/dynamic factor/reliability分类
交通工程引用本文复制引用
王力东,黎清蓉,卜秀孟,韩艳,李凯..基于可靠度理论的中低速磁浮车-桥系统轨道梁动力系数研究[J].土木与环境工程学报（中英文）,2025,47(3):190-200,11.基金项目
国家自然科学基金(52208459、52178452) （52208459、52178452）
湖南省自然科学基金(2022JJ40496) （2022JJ40496）
中国博士后科学基金(2022M723004) （2022M723004）
长沙理工大学桥梁工程安全控制教育部重点实验室开放基金(22KB02) National Natural Science Foundation of China(Nos.52208459,52178452) （22KB02）
Natural Science Foundation of Hunan Province(No.2022JJ40496) （No.2022JJ40496）
China Postdoctoral Science Foundation(No.2022M723004) （No.2022M723004）
Open Fund of Key Laboratory of Safety Control of Bridge Engineering,Ministry of Education(Changsha University of Science&Technology)(No.22KB02) （Changsha University of Science&Technology）
