南浦大桥形变GPS动态监测试验及结果分析

GPS-Based Dynamic Monitoring and Analysis of Nanpu Bridge Deformation

摘要:

采用14台全球定位系统(GPS)接收机对上海南浦大桥实施连续4 d形变监测,结合南浦大桥GPS监测试验,建立桥梁坐标系统(BCS)并进行相应的坐标转换,对数据精度及桥梁的静态和动态特性进行分析,证实了GPS技术完全可以应用于大中型桥梁的监测,而且相对于传统的监测工具具有自身的优势.

关键词:桥梁动态监测,南浦大桥,全球定位系统(GPS),频谱分析

Abstract:

14 global positioning system(GPS) receivers were employed to monitor the deformations of the Nanpu Bridge in Shanghai for 4 consecutive days in September 2006.A dedicated bridge coordinate system was established to analyze and relevant algorithm was used for the coordinate transformation.The precision of the resulting coordinate time series and the static and dynamic characteristics of the bridge deformation were analyzed.Analysis results show that GPS positioning is fully capable to monitor the deformations of medium to large size bridges and the critical parameters about the structural health conditions of these bridges can be reliably extracted from the 3D coordinate time series.Through the trial,it further proves that GPS positioning technique has unique merits over other traditional monitoring tools.

Key words:bridge dynamic monitoring,the Nanpu Bridge,global positioning system,spectrum analysis