基于RTK-GPS技术的高索塔振动试验与分析  

Ambient vibration test of high pylon based on RTK-GPS technology

作　　者：许昌[1,2] 岳东杰[1] 

机构地区：[1]河海大学土木工程学院,南京210098 [2]浙江水利水电专科学校水利工程系,杭州310018

出　　处：《振动与冲击》2010年第3期134-136,146,共4页Journal of Vibration and Shock

基　　金：水文水资源与水利工程科学国家重点实验室开放研究基金(2008491211);海岸灾害及防护教育部重点实验室开放研究基金(200807)

摘　　要：随着全球定位系统(GPS)技术的不断成熟,这一实时、高动态、高精度的观测手段已逐步应用于大型桥梁的健康监测中。以某一斜拉桥高索塔为背景,建立基于RTK-GPS技术的高索塔监测系统。介绍接收机和监测点位的布设以及监测坐标系的建立。针对监测过程中所受到各类误差影响源的干扰特别是GPS多路径、环境温度变化和风荷载等低频噪声,主要采用小波多尺度分析法,对这些低频噪声和振动信号进行有效分离。通过频谱分析获取该高索塔自立状态下的自振主频,与有限元分析的结果吻合。The technology of real time kinematic global positioning system (RTK-GPS) has been used gradually in the health monitoring of large structures in recent years.A structure monitoring system based on the RTK-GPS technology was devised for the high pylon of a cable-stayed bridge.The GPS receiver and its deployment,and the monitoring coordinate system for such system were also described.The rough GPS observable data were processed by using the wavelet multi-resolution analysis (MRA),to eliminate some error sources or biases (e.g.multipath,temperature and wind effect) contained in the GPS observable data.The low-frequency noise and vibration signals were effectively separated,and the natural frequency of the self-erected pylon was availably obtained by using the frequency spectrum analysis.The measuring results are consistent with the predicted values by the finite element model (FEM) analysis.

关 键 词：RTK—GPS 高索塔 小波多尺度分析 频谱分析 自振频率 

分 类 号：U441[建筑科学—桥梁与隧道工程]