地铁运营期间大跨连续刚构桥非平稳振动特性现场测试  

Field testing of non-stationary vibration characteristics of long-span continuous rigid-frame bridges during metro operation

作　　者：朱芳 周懿桐 符宇轩 曾旸凌 张佳文 Zhu Fang;Zhou Yitong;Fu Yuxuan;Zeng Yangling;Zhang Jiawen(School of Civil Engineering and Architecture,Jishou University,Zhangjiajie Hunan 427000,China)

机构地区：[1]吉首大学土木工程与建筑学院,湖南张家界427000

出　　处：《山西建筑》2025年第10期128-131,共4页Shanxi Architecture

基　　金：国家级大学生创新创业项目(项目编号:S202310531008)。

摘　　要：轨道车辆运行引起桥梁的振动具有非平稳特性,可用于移动荷载识别和结构损伤监测。为研究地铁运营期间刚构桥的振动特性,以长沙2号线地铁某大跨连续刚构桥为研究对象,采用基于Complex Morlet小波基的小波分析方法,获取地铁运营期间不同工况下桥梁的振动信号,对测试信号的非平稳特性与列车荷载的关联性进行了定性分析。分析了地铁速度、地铁在桥上紧急制动以及地铁交会对桥梁时频特性的影响。结果表明:采用小波滤波和连续小波变换可在低频范围内,清晰显现不同工况下桥梁频率随列车移动而产生的变化。The vibration of bridges induced by the operation of rail vehicles exhibits non-stationary characteristics,which can be utilized to identify vehicle loads and bridge damage.While theoretical research in this area is extensive,practical applications remain limited.This paper focuses on a long-span continuous rigid-frame bridge along Changsha Metro Line 2 as the research subject.Vibration signals of the bridge under various train load conditions were collected,and wavelet analysis was employed to qualitatively analyze the correlation between the non-stationary characteristics of the measured signals and the train loads.The effects of metro speed,emergency braking of the metro on the bridge,and metro crossings on the time-frequency characteristics of the bridge were investigated.The results demonstrate that wavelet filtering and continuous wavelet transform can clearly reveal the variations in bridge frequency under different conditions as the train moves,particularly in the low-frequency range.

关 键 词：地铁 非平稳特性 连续刚构桥 小波变换 现场测试 

分 类 号：TU997[建筑科学—市政工程] U448.23[建筑科学—桥梁与隧道工程]