| 大跨度斜拉桥模态参数识别时频方法对比研究 |
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| 引用本文： | 茅建校,王浩,荀智翔.大跨度斜拉桥模态参数识别时频方法对比研究[J].同济大学学报(自然科学版),2016,44(7):0996-1001. |
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| 作者姓名： | 茅建校 王浩 荀智翔 |
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| 作者单位： | 东南大学 混凝土及预应力混凝土结构教育部重点实验室， 江苏 南京 210096,东南大学 混凝土及预应力混凝土结构教育部重点实验室， 江苏 南京 210096,东南大学 混凝土及预应力混凝土结构教育部重点实验室， 江苏 南京 210096 |
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| 基金项目： | 国家973计划青年科学家专题（2015CB060000）；国家自然科学基金项目（51378111）；教育部新世纪优秀人才支持计划资助项目（NCET-13-0128）；霍英东青年教师应用研究项目（142007） |
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| 摘 要： | 利用苏通大桥结构健康监测系统(SHMS)记录的台风期间大桥加速度响应,分别基于希尔伯特-黄变换(HHT)和小波变换(WT)方法对该桥进行了模态参数识别,并将2种识别结果进行对比.在此基础上,进一步研究了模态阻尼比与桥址区实测平均风速的关系.结果表明:基于HHT和WT方法识别出的模态频率值基本一致;模态阻尼比差距较大,基于HHT方法识别的阻尼比均值略大于基于WT方法的识别结果;基于HHT和WT方法识别的模态阻尼比随风速的变化趋势类似.
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| 关 键 词： | 苏通大桥 模态参数识别 希尔伯特-黄变换(HHT) 小波变换(WT) |
| 收稿时间： | 2015/8/19 0:00:00 |
| 修稿时间： | 2016/5/11 0:00:00 |
Comparison Study on Modal Parameter Identification of Large Span Cable Stayed Bridge With Time frequency Method |
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| MAO Jianxiao,WANG Hao and XUN Zhixiang.Comparison Study on Modal Parameter Identification of Large Span Cable Stayed Bridge With Time frequency Method[J].Journal of Tongji University(Natural Science),2016,44(7):0996-1001. |
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| Authors: | MAO Jianxiao WANG Hao and XUN Zhixiang |
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| Institution: | Key Laboratory of Concrete and Prestressed Concrete Structures of the Ministry of Education, Southeast University, Nanjing 210096, China,Key Laboratory of Concrete and Prestressed Concrete Structures of the Ministry of Education, Southeast University, Nanjing 210096, China and Key Laboratory of Concrete and Prestressed Concrete Structures of the Ministry of Education, Southeast University, Nanjing 210096, China |
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| Abstract: | Acceleration responses of Sutong Bridge during typhoon Haikui were recorded by structural health monitoring system (SHMS). On the basis of recorded data, the modal parameter identification of the bridge was conducted with Hilbert Huang transform (HHT) and wavelet transform (WT) methods, and the identified results were compared with each other. Then, the relationship between modal damping ratios and measured mean wind speed at the bridge site was studied. Results show that the identified modal frequencies based on the HHT method are almost the same with the WT based modal frequencies. However, the difference between modal damping ratios is larger, which exhibits that the mean values of HHT based damping ratios are larger than those WT based results. Besides, the wind speed related varying trends of modal ratios identified by the HHT method are identical with those by the WT method. |
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| Keywords: | Sutong Bridge modal parameter identification Hilbert Huang transform (HHT) wavelet transform (WT) |
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