哈尔滨四方台斜拉桥模态参数和索力识别
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摘要
桥梁的模态参数是修正有限元模型、识别损伤及桥梁状态评估的重要参数。动力测试是获得模态参数的必要途径。建立了哈尔滨四方台大桥的有限元模型;利用8个力平衡加速度传感器采用分组测试的方式测试了桥面加速度,利用压电传感器测试了斜拉索的加速度;联合NExT法和ERA法进行了斜拉桥模态参数识别,并将识别结果与有限元模型的计算结果进行了对比分析;采用拉索基频的频差拟合识别法进行频率及索力识别,并进行了实测索力与设计索力的对比分析。
Finite element model of Harbin Sifangtai Bridge was established,eight accelerometers with force feedback were applied to measure acceleration of bridge deck by the way of group test;piezoelectric accelerometer was applied to measure acceleration of cable;and the combined method of NExT and ERA was applied to identify the cable-stayed bridge modal parameters.The identification result was compared with the calculated result by FEM.Frequency difference fitting method was introduced to identify frequency and tension of cable and the result was compared with the designed cable tension of real bridge.
Finite element model of Harbin Sifangtai Bridge was established,eight accelerometers with force feedback were applied to measure acceleration of bridge deck by the way of group test;piezoelectric accelerometer was applied to measure acceleration of cable;and the combined method of NExT and ERA was applied to identify the cable-stayed bridge modal parameters.The identification result was compared with the calculated result by FEM.Frequency difference fitting method was introduced to identify frequency and tension of cable and the result was compared with the designed cable tension of real bridge.
引文
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[16]乔陶鹏,严普强,邓焱,傅琦,等.斜拉索索力估算中振动信号处理方法的改进[J].清华大学学报(自然科学版),2003,43(5):644-647.
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[20]Ren WeiXin,Liu HaoLiang,Chen Gang.Determination of Cable Tensions Based on Frequency Differences[J].Engi-neering Computation-An International Journal for Computer-Aided Engineering and Software,2008,25(2):172-189.
[2]续秀忠,华宏星,陈兆能.基于环境激励的模态参数辨识方法综述[J].振动与冲击,2002,21(3):2-5.
[3]孙晓兰,王太勇.基于相关函数的振动结构工作模态参数识别方法[J].天津大学学报,2007,40(4):503-506.
[4]纪晓东,钱稼茹,徐龙河.模拟环境激励下结构模态参数识别试验研究[J].清华大学学报,2006,46(6):769-772.
[5]Yu DanJiang,Ren WeiXin.EMD-based Stochastic Subspace Identification of Structures from Operational Vibration Meas-urements[J].Engineering Structures,2005,27:1741?1751.
[6]常军,孙利民,张启伟.一种分段平稳随机信号的参数识别方法[J].振动与冲击,2007,26(6):17-20.
[7]樊可清,倪一清,高赞明.改进随机子空间系统辨识方法及其在桥梁状态监测中的应用[J].中国公路学报,2004,17(4):70-73.
[8]徐良,江见鲸,过静?.随机子空间识别在悬索桥实验模态分析中的应用[J].工程力学,2002,19(4):46-49.
[9]Mevel L,Goursat M.Stochastic Subspace-based Structural I-dentification and Damage Detection and Localization-Applica-tion to the Z24Bridge Benchmark[J].Mechanical Systems and Signal Processing,2003,17(1):143-151.
[10]Zhang Y,Xu X,Hua H.Modal Parameter Identification Using Response Data Only[J].Journal of Sound and Vibration,2005,282:367-380.
[11]王学敏,黄方林,刘建军.大型桥梁模态参数识别的一种方法[J].工程力学,2007,24(2):110-114.
[12]李中付,华宏星,宋汉文,等.非稳态环境激励下线性结构的模态参数辨识[J].振动工程学报,2002,15(2):139-143.
[13]张志谊,续秀忠,华宏星,等.基于信号时频分解的模态参数识别[J].振动工程学报,2002,15(4):389-394.
[14]Yan B F,Miyamoto A,Bruhwiler E.Wavelet Transform-based Modal Parameter Identification Considering Uncertainty[J].Journal of Sound and Vibration,2006,291:285-301.
[15]陈刚,任伟新.基于环境振动的斜拉桥拉索基频识别[J].地震工程与工程振动,2003,23(3):100-106.
[16]乔陶鹏,严普强,邓焱,傅琦,等.斜拉索索力估算中振动信号处理方法的改进[J].清华大学学报(自然科学版),2003,43(5):644-647.
[17]张宏跃,田石柱.提高斜拉索索力估算精度的方法[J].地震工程与工程振动,2004,24(4):148-151.
[18]刘文峰,应怀樵,柳春图.考虑刚度及边界条件的索力精确求解[J].振动与冲击,2003,22(4):12-14.
[19]陈刚.振动法测索力与实用公式[D].福州:福州大学,2003.
[20]Ren WeiXin,Liu HaoLiang,Chen Gang.Determination of Cable Tensions Based on Frequency Differences[J].Engi-neering Computation-An International Journal for Computer-Aided Engineering and Software,2008,25(2):172-189.
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