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Structural Monitoring and Maintenance
  Volume 5, Number 1, March 2018 , pages 129-150

Structural performance monitoring of an urban footbridge
P.S. Xi, X.W. Ye, T. Jin and B. Chen

    This paper presents the structural performance monitoring of an urban footbridge located in Hangzhou, China. The structural health monitoring (SHM) system is designed and implemented for the footbridge to monitor the structural responses of the footbridge and to ensure the structural safety during the period of operation. The monitoring data of stress and displacement measured by the fiber Bragg grating (FBG)-based sensors installed at the critical locations are used to analyze and assess the operation performance of the footbridge. A linear regression method is applied to separate the temperature effect from the stress monitoring data measured by the FBG-based strain sensors. In addition, the static vertical displacement of the footbridge measured by the FBG-based hydrostatic level gauges are presented and compared with the dynamic displacement remotely measured by a machine vision-based measurement system. Based on the examination of the monitored stress and displacement data, the structural safety evaluation is executed in combination with the defined condition index.
Key Words
    structural health monitoring; urban footbridge; optical fiber sensor; linear regression model; machine vision; safety evaluation
P.S. Xi, X.W. Ye, T. Jin and B. Chen: Department of Civil Engineering, Zhejiang University, Hangzhou 310058, China

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