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

发布时间：2018-03-03 20:07

本文选题：高寒地区　切入点：冻融循环　出处：《中国铁道科学》2017年06期 　论文类型：期刊论文

【摘要】：针对高速铁路多跨简支梁桥墩—梁间振动强耦合的特点,采用复合随机子空间模态分析方法和冲击振动试验法相结合的信号处理方法,对高寒地区高速铁路简支梁桥的下部结构在1个完整冻融循环周期内4次动力测试结果进行分析,并对桥梁下部结构的模态参数进行识别,分析冻融循环对桥梁下部结构模态参数的影响规律。结果表明:随着冻结深度的增加,桥墩各阶横向振动频率均会增大,且全桥横向交错振动频率的增大趋势最为显著,最大增幅达36.8%;墩身高度是影响桥梁下部结构模态频率的主要设计参数,墩高对全桥横向交错振动模态的影响大于全桥横向整体摆动模态,随着墩高的增加,全桥横向交错振动频率在3~9 Hz之间变化,全桥横向整体摆动频率在2~4Hz之间变化;冻融循环作用下地质条件对桥墩的模态频率几乎没有影响。
[Abstract]:In view of the strong vibration coupling between piers and beams of multi-span simply supported beams in high-speed railway, a signal processing method combining the method of complex random subspace modal analysis and the method of shock vibration test is adopted. The dynamic test results of the substructure of a simple supported beam bridge in a freeze-thaw cycle in alpine region are analyzed, and the modal parameters of the bridge substructure are identified. The influence of freeze-thaw cycle on the modal parameters of the bridge understructure is analyzed. The results show that with the increase of freezing depth, the transverse vibration frequency of the pier will increase, and the increasing trend of the transverse staggered vibration frequency of the whole bridge is the most obvious. The maximum increment is 36.8. The height of pier is the main design parameter which affects the modal frequency of the bridge's understructure. The influence of pier height on the transverse staggered vibration mode of the whole bridge is greater than that of the whole bridge, and with the increase of the pier height, The transverse staggered vibration frequency of the whole bridge varies from 3 Hz to 9 Hz, and the whole lateral vibration frequency varies from 2 Hz to 4 Hz, and the geological conditions have little effect on the modal frequency of the pier under the action of freeze-thaw cycle.
【作者单位】：北京交通大学土木建筑工程学院;
【基金】：国家“九七三”计划项目(2013CB036203) 中国铁路总公司科技研究开发计划项目(2015G006-M) 中央高校基本科研业务费专项资金资助项目(2016YJS111)
【分类号】：U441

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