测绘通报 ›› 2019, Vol. 0 ›› Issue (10): 35-39.doi: 10.13474/j.cnki.11-2246.2019.0314

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

WANG Peng1, XING Cheng2,3, XIANG Xia4   

  1. 1. School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China;
    2. School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, China;
    3. Laboratory of Precision Engineering and Industrial Surveying of National Administration of Surveying, Mapping and Geoinformation, Wuhan 430079, China;
    4. College of Water Resource & Hydropower, Sichuan University, Chengdu 610065, China
  • Received:2019-03-17 Revised:2019-05-08 Online:2019-10-25 Published:2019-10-26

Abstract: 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.

Key words: ground-based radar interferometry, bridge-span structure, modal analysis, frequency domain decomposition, singular value decomposition

CLC Number: