中国铁道科学2017，Vol.38Issue(6)：47-55,9.DOI:10.3969/j.issn.1001-4632.2017.06.07
高寒地区高速铁路桥梁下部结构模态参数的变化规律研究
Study on Change Law of Modal Parameters of Bridge Substructure for High Speed Railway in Alpine Region
摘要
Abstract
According to the strong coupling between the pier and beam of multi-span simply-supported beam bridge for high speed railway,four dynamic tests were carried out on the substructure of simply-supported beam bridge for high speed railway during a whole freeze-thaw cycle in alpine region.Test results were analyzed by the signal processing method which combined complex stochastic subspace modal analysis method with impact vibration test method.The modal parameters of substructure were identified and the influence of freeze-thaw cycles on the modal parameters of substructure was analyzed.Results show that with the increase of freezing depth,the lateral vibration frequency of pier at each order increases.The increase tendency of the interlaced vibration frequency in the transverse direction of the whole bridge is the most significant,and the maximum increase is 36.8％.The pier height is the main design factor affecting the modal frequency of bridge substructure,and the influence of pier height on the interlaced vibration mode in the transverse direction of the whole bridge is greater than the overall transverse swing mode of the whole bridge.With the increase of pier height,the interlaced vibration frequency in the transverse direction of the whole bridge varies between 3 ～ 9 Hz and the overall transverse swing frequency varies between 2～4 Hz.The geological conditions under the action of freeze-thaw cycle have little influence on the modal frequency of bridge pier.关键词
高寒地区/冻融循环/高速铁路/简支梁桥/下部结构/模态参数Key words
Alpine region/Freeze-thaw cycle/High speed railway/Simply supported girder bridge/Substructure/Modal parameter分类
交通工程引用本文复制引用
闫宇智,战家旺,张楠,夏禾,强伟亮..高寒地区高速铁路桥梁下部结构模态参数的变化规律研究[J].中国铁道科学,2017,38(6):47-55,9.基金项目
国家“九七三”计划项目(2013CB036203) （2013CB036203）
中国铁路总公司科技研究开发计划项目(2015G006-M) （2015G006-M）
中央高校基本科研业务费专项资金资助项目(2016YJS111) （2016YJS111）
