Research on the bridge monitoring method of ground-based radar
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ORIGINAL PAPER
Research on the bridge monitoring method of ground-based radar Cheng Xing 1
&
Peng Wang 2 & Wei Dong 3
Received: 9 December 2019 / Accepted: 17 November 2020 # Saudi Society for Geosciences 2020
Abstract Bridge is an important infrastructure, and with the increase of bridge construction, the factors such as material aging and traffic congestion will affect the structural health of bridges. Therefore, the special attention should be paid to the regular deformation monitoring and health assessment of bridges. Due to the increasing monitoring requirements for large scale and span bridges, some new monitoring methods should be added as a complement to traditional monitoring methods such as precise leveling, total station, GNSS, terrestrial laser scanning, and so on. With the unique advantages of non-contact and real time, the microwave interferometry technology has become one of the means for deformation monitoring of bridges. The ground-based interferometric radar system has a high sampling rate in both the time and space domain, and it can be an effective complement to traditional methods. In this paper, the basic principle of ground-based interferometric radar system for dynamic deformation monitoring is briefly described. An improved projection method for computing the deflection with ground-based radar data is illustrated and is compared with the traditional projection method. A method for local relative deformation analysis of the bridge based on the characteristics of ground-based radar data is proposed. There are two parameters described for evaluating the local deformation of the bridge. Through the analysis of the deformation process of the bridge in a static load experiment, the feasibility of the method in the actual bridge structure safety monitoring is illustrated. Keywords Ground-based interferometric radar . Deflection . Monitoring . Deformation analysis
Introduction Bridges, such as highway bridges, railway bridges, and highspeed railway bridges, play an important role in transportation and infrastructure construction. With the increase of bridge construction, the factors, such as material aging, fatigue of the structure, overload, traffic congestion, and natural/human Responsible Editor: Biswajeet Pradhan * Cheng Xing [email protected]; [email protected] Peng Wang [email protected] Wei Dong [email protected] 1
School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, China
2
School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China
3
China Railway Siyuan Survey and Design Group Co., LTD, Wuhan 430063, China
hazards, will affect the structural health of bridges, and these factors may lead to bridge collapse and result in casualties and huge property losses. Therefore, regular deformation monitoring and health assessment of bridges are particularly important. Early detection of bridge defects can greatly save the maintenance cost of bridges, avoid the major losses caused by frequent overhaul of closed t
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