基于地基干涉雷达的大型桥梁动态挠度监测与分析  

Monitoring dynamic deflection of large bridge by using ground-based interferometric radar

作　　者：刘春[1] 程起军 李俊义[2] 杜钊锋 

机构地区：[1]同济大学测绘与地理信息学院,上海200092 [2]国家测绘地理信息局第一大地测量队,西安710054

出　　处：《工程勘察》2017年第1期53-58,共6页Geotechnical Investigation & Surveying

基　　金：国家重点基础研究发展计划(973计划)项目(2013CB733204)

摘　　要：本文阐述了地基干涉雷达测量的基本原理,介绍了地基干涉雷达中集成的两项关键技术,分析了地基干涉雷达应用于大型桥梁动态挠度监测的优点,构建了测量形变值向挠度值转换的变换模型。结合IBIS-S型地基干涉雷达安庆长江铁路大桥监测实例,选取了热、估信噪比这两个指标分析了所采集数据的质量,并且结合数据的特点,在无载的情况下讨论了地基干涉雷达的测量精度。最后基于动载条件下的数据分析了桥梁动态挠度变化的特征规律。In this paper, the basic principle of ground-based interferometric radar is elaborated and the two key technologies are introduced. The technical advantages are analyzed when it applies in large bridges dynamic deflection monitoring and a translation model between the value of deformation and deflection is build. The data quality of the ground-based interferometric radar is analyzed with two indicators including Thermal SNR and Estimated SNR, which is based on the case study of Anqing Changjian$ River Railway Bridge. And combining the characteristics of the data, the measurement accuracy of the device and dynamic deformation laws of the bridge are analyzed with no-load and load situations respectively.

关 键 词：地基干涉雷达 动态挠度 精度 

分 类 号：P225.1[天文地球—大地测量学与测量工程]