基于地震激励的混凝土桥梁模态参数识别

英文篇名：Concrete bridge modal parameter identification under seismic excitations
中文刊名：吉林大学学报(工学版)
英文刊名：Journal of Jilin University(Engineering and Technology Edition)
作者：姜浩 ; 郭学东
英文作者：JIANG Hao1 ; 2 ; GUO Xue-dong2(1.Civil Engineering Department ; Jilin Architectural and Civil Engineering Institute ; Changchun 130021 ; China ; 2.College of Transportation ; Jilin University ; Changchun 130022 ; China)
中文关键词：结构工程 ; 模态参数识别 ; 地震激励 ; 自然激励技术 ; 环境激励
英文关键词：engineering mechanics ; modal parameter identification ; seismic excitation ; NExT ; ambient excitation
出版日期：2011-09-15
机构：吉林建筑工程学院土木工程学院;吉林大学交通学院;
年：2011
期：S2
出版单位：吉林大学学报(工学版)

摘要

为探讨基于地震激励下自然激励技术(NExT)结合特征系统实现算法(ERA)对于混凝土桥梁模态参数识别的可行性,对某一预应力混凝土连续梁桥进行了数值仿真分析。通过有限元分析软件建立了桥梁的三维实体模型,对模型进行有限元模态分析和时程分析,并利用强震记录实现地震激励,利用加速度信号、考虑外界白噪声的影响,在仅有输出响应信号的情况下采用NExT/ERA方法识别预应力混凝土桥梁的模态参数。通过数值仿真分析,识别出结构前4阶模态参数,与有限元模态分析得到的模态参数相比较,二者误差较小,吻合较好。
To study validity of NExT/ERA method which be used to identify modal parameter of concrete bridge under seismic excitations,the number simulation of one pre-stressed concrete bridge was carried out.3D model of the bridge was established by FEM software.FEM analysis and time-history analysis of 3D model of PC continuous beam bridge were carried out.Seismic excitations was generated by strong earthquake records.During the simulation,practical factors such as acceleration measuring and white noise were taken into account.In the only case of the output signal modal parameter of bridge can be identified.Four-order modal parameters of the structure were identified by the number simulation.The error of the modal parameters between number simulation and FEM analysis is small.

引文

[1]于繁华,刘寒冰.基于支持向量机和粒子群算法的结构损伤识别[J].吉林大学学报:工学版,2008,38(2):434-438.Yu Fan-hua,Liu Han-bing.Structural damage identi-fication by support vector machine and particleswarm algorithm[J].Journal of Jilin University(En-gineering and Technology Edition),2008,38(2):434-438.
    [2]樊江玲,张志谊,华宏星.Gabor变换在模态参数辨识中的应用[J].噪声与振动控制,2009(6):15-18.Fan Jiang-ling,Zhang Zhi-yi,Hua Hong-xing.Appli-cation of gabor expansion in modal parameter identi-fication[J].Noise and Vibration Control,2009(6):15-18.
    [3]Du Xiu-li,Wang feng-quan.Modal parameter identi-fication under non-stationary ambient excitationbased on continuous time AR Model[J].Science inChina Series E-Technological Sciences,2009,52(11):3180-3187.
    [4]侯立群,欧进萍.基于时频分析的运营桥梁模态参数识别方法[J].振动工程学报,2009,22(1):19-25.Hou Li-qun,Ou Jin-ping.Modal parameters identifi-cation of bridge in serve based on time-frequency a-nalysis[J].Journal of Vibration Engineering,2009,22(1):19-25.
    [5]Lian Ji-jian,Li Huo-kun,Zhang Jian-wei.ERA modalidentification method for hydraulic structures basedon order determination and noise reduction of singularentropy[J].Science in China Series E-TechnologicalSciences.2009,52(2):400-412.
    [6]Hou Li-qun,Ou Jin-ping,Zhao Xue-feng,et al.Identi-fication of modal parameters and cable tension of Har-bin sifangtai bridge[J].Journal of Vibration andShock,2009,28(5):106-110.