铁道标准设计2025，Vol.69Issue(4)：42-49,8.DOI:10.13238/j.issn.1004-2954.202305290005
大跨度斜拉桥无砟轨道结构静动力特性研究
Study on Static and Dynamic Characteristics of Ballastless Track Structure on Long Span Cable-Stayed Bridges
摘要
Abstract
Long span cable-stayed bridges are influenced by multiple factors during operation,which can lead to significant deflection and deformation of the bridge deck,affecting the service performance of the ballastless track.The adaptability of ballastless track structures on long span bridges urgently requires further investigation.This study focuses on a long span cable-stayed bridge with a main span of 420 m and a design speed of 350 km/h.Using the finite element method and vehicle-track coupling dynamics theory,a refined model of the long span cable-stayed bridge-ballastless track and a vehicle-track rigid-flexible coupling model were established.The stress and structural-following characteristics of the ballastless track under environmental load-induced deformations were analyzed.Additionally,frequency domain analysis was conducted to investigate the track irregularity caused by bridge deformation and the vibration characteristics of the track slab during operation.The results showed that the maximum equivalent stress of the track slab under all working conditions occurred at the limit protrusion of the track slab at the beam end,with a maximum value of 5.04 MPa.After considering the interlayer pre-compression generated by the self-weight of the track slab,the maximum interlayer gap during bridge deformation was 0.03 mm.The power spectral density curve of the track irregularity caused by bridge deformation was slightly higher than the Chinese ballastless track spectrum in the wavelength range of 120 to 200 m.During train operation,the maximum acceleration of the track slab caused by bridge deformation was 1.63 m/s2.The main vibration frequency of the track slab under all working conditions was 11.73 Hz,with peak values observed in multiple sections at the same frequency.The study revealed that,except for the limit protrusion of the track slab at the beam end,the stress in the track structure was lower than the design value for C40 concrete,and the ballast structure exhibited good following behavior.The energy of track irregularity caused by bridge deformation was mainly concentrated in wavelengths above 120 m.Compared to random irregularities,the long-wave irregularities caused by environmental loads had a relatively small impact on the dynamic response of the track slabs during train operation.关键词
高速铁路/大跨度斜拉桥/无砟轨道/有限元/刚柔耦合/静动力特性Key words
high-speed railway/long span cable-stayed bridge/ballastless track/finite element/rigid-flexible coupling/static and dynamic characteristics分类
交通工程引用本文复制引用
胡志鹏,孙宗磊,张浩然,刘凯,薛旻,吕涛..大跨度斜拉桥无砟轨道结构静动力特性研究[J].铁道标准设计,2025,69(4):42-49,8.基金项目
中国国家铁路集团有限公司科技研究开发计划项目(N2022G066) （N2022G066）
中国铁建股份有限公司科技研究开发计划项目(2021-C50) （2021-C50）
中铁第一勘察设计院集团有限公司科研开发项目(院科 2021KY59YB-13) （院科 2021KY59YB-13）
