一种基于GNSS-RTK的大跨径桥梁模态参数识别方法  

A modal parameter identification method of long-span bridges based on GNSS-RTK technology

作　　者：潘博闻 李志 牛彦波[3] PAN Bowen;LI Zhi;NIU Yanbo(Tianjin Surveying and Hydrography Co.,Ltd.,Tianjin 300304,China;Changjiang River Scientific Research Institute,Wuhan 430010,China;School of Civil Engineering,Tianjin University,Tianjin 300350,China)

机构地区：[1]天津市陆海测绘有限公司,天津300304 [2]长江科学院,武汉430010 [3]天津大学建筑工程学院,天津300350

出　　处：《导航定位学报》2021年第1期109-115,共7页Journal of Navigation and Positioning

摘　　要：为了进一步改善运营期大跨径桥梁结构模态参数的识别精度,提出1种基于全球卫星导航系统(GNSS)实时动态差分(RTK)的大跨径桥梁模态参数识别方法:给出方法的基本原理;利用切比雪夫滤波方法对GNSS原始观测信息进行滤波处理;然后利用互补集合经验模态分解(CEEMD)与随机减量技术(RDT),从滤波信号中提取结构的模态参数(固有频率与阻尼比)。实验结果表明:该方法可以去除由于噪声影响所产生的虚假模态,并且模态提取结果与有限元分析结果吻合;GNSS-RTK技术可有效应用到大跨径桥梁结构变形监测中。In order to further improve the identification accuracy of modal parameters of long-span bridges in operation period,the paper proposed a method of the modal parameter identification based on Global Navigation Satellite Systems(GNSS)under the Real Time Kinematic(RTK)mode:the basic principle of the method was given;and Chebyshev filter was used to filtering the original observation information of GNSS;then the structural modal parameters of natural frequencies and damping ratios were extracted from the filter signals by using Complementary Ensemble Empirical Mode Decomposition(CEEMD)and Random Decrement Technique(RDT).Experimental result showed that the proposed method could overcome the problem that there may be illusive modes in the vibration signals;and the modal extraction output could agree well with the predicted values of the finite element analysis,which also illustrated that GNSS-RTK technique could be efficiently applicable to monitor the dynamic displacements of long-span bridges.

关 键 词：全球卫星导航系统 实时动态差分 大跨径桥梁 互补集合经验模态分解 随机减量技术 模态参数识别方法 

分 类 号：P228[天文地球—大地测量学与测量工程]