地基干涉雷达IBIS-S桥跨结构振动变形测量与模态分析  

Vibration deformation measurement and modal analysis for large bridge span using ground-based interferometric radar IBIS-S

作　　者：王鹏[1] 邢诚[2,3] 项霞[4] WANG Peng;XING Cheng;XIANG Xia(School of Environmental Science and Engineering,Suzhou University of Science and Technology,Suzhou 215009,China;School of Geodesy and Geomatics,Wuhan University,Wuhan 430079,China;Laboratory of Precision Engineering and Industrial Surveying of National Administration of Surveying,Mapping and Geoinformation,Wuhan 430079,China;College of Water Resource&Hydropower,Sichuan University,Chengdu 610065,China)

机构地区：[1]苏州科技大学环境科学与工程学院,江苏苏州215009 [2]武汉大学测绘学院,湖北武汉430079 [3]精密工程与工业测量国家测绘地理信息局重点实验室,湖北武汉430079 [4]四川大学水利水电学院,四川成都610065

出　　处：《测绘通报》2019年第10期35-39,共5页Bulletin of Surveying and Mapping

基　　金：国家自然科学基金(41801381);湖北省自然科学基金(2017CFB654);江苏省自然科学基金(BK20170379)

摘　　要：地基雷达干涉测量技术能够以较高的时空采样频率获取线性结构目标整体瞬时变形状态。本文将该技术引入大型桥梁桥跨结构的振动变形测量与模态分析中。对动静载试验过程中的武汉二七长江大桥东岸桥跨结构开展连续变形监测,利用频域分解法计算桥跨结构的自振频率、阻尼比和模态振型。计算结果表明,地基干涉雷达干涉测量技术能够快速探测桥跨结构竖弯模态,特别适用于灾后大型线形结构健康状态的应急检测。Ground-based radar interferometry was proposed into vibration deformation measuring and modal analysis of bridge span structure in large-scale bridge which could obtain instantaneous deformation state of the whole linear structure with high sampling frequency.Ground-based interferometric radar IBIS-S was used to monitor structure deformation in the east bank of Wuhan Erqi Yangtze River Bridge under static and dynamic loading.The natural frequency,damping ratio and mode shape were separately calculated using frequency domain decomposition method.Results show that IBIS-S can detect bending modes of large bridges,especially for emergency testing of structure health status after being affected by disasters.

关 键 词：地基雷达干涉测量 桥跨结构 模态分析 频域分解法 奇异值分解 

分 类 号：P228[天文地球—大地测量学与测量工程]