Fiber optic based monitoring system applied to a centenary metallic arch bridge: Design and installation

Abstract In the last decade, fiber optic sensors (FOSs) have been increasingly preferred over electrical ones to integrate structural health monitoring systems installed on new bridges. The added value of this sensing technology in appraising the behavior of centenary structures is also unquestionable. In this article the design of an advanced monitoring system based on fiber Bragg gratings (FBGs) and implemented in a XIX century steel arch bridge is reported. Three major requirements had to be attained with its installation. Firstly, welding solutions for attaching strain sensors to the steel surface were not permitted due to its chemical properties; secondly, the monitoring system should provide reliable data concerning the structure’s behavior at least for a decade; thirdly, FOSs retrofitted to the bridge should have a minimum impact in its aesthetics. Techniques and materials adopted in the system installation and protection of sensors and optical components are pointed out. Experimental tests carried out to comprehensively characterize the sensors response are described, and their results discussed. The guidelines considered in the development of the project, system architecture and objectives to accomplish are also presented. Additionally, some characteristic results of the bridge response during the initial monitoring period are shown.

[1]  Dong Gun Lee,et al.  Characterization of Fiber Optic Sensors for Structural Health Monitoring , 2002 .

[2]  Tommy H.T. Chan,et al.  Fiber Bragg grating sensors for structural health monitoring of Tsing Ma bridge : Background and experimental observation , 2006 .

[3]  Daniele Inaudi,et al.  Integrity monitoring of an old steel bridge using fiber optic distributed sensors based on Brillouin scattering , 2007, SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring.

[4]  Peter L. Fuhr,et al.  Fiber Optic Sensing of a Bridge in Waterbury, Vermont , 1999 .

[5]  Brahim Benmokrane,et al.  Structural health monitoring of innovative bridges in Canada with fiber optic sensors , 2001 .

[6]  Joaquim Figueiras,et al.  Testing and monitoring of a centenary arch bridge , 2005 .

[7]  T. K. Gangopadhyay,et al.  Fibre Bragg gratings in structural health monitoring—Present status and applications , 2008 .

[8]  Michael A. Davis,et al.  Fiber grating sensors , 1997 .

[9]  Daniele Inaudi,et al.  FIBER OPTIC SENSORS FOR STRUCTURAL CONTROL , 2008 .

[10]  Mark Seaver,et al.  Bragg grating-based fibre optic sensors in structural health monitoring , 2007, Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences.

[11]  S. Abrate,et al.  Structural Monitoring with Fiber Optic Technology , 2001 .

[12]  Daniel Betz,et al.  Structural Monitoring Using Fiber-Optic Bragg Grating Sensors , 2003 .

[13]  Nezih Mrad,et al.  Strain monitoring and fatigue life of Bragg grating fiber optic sensors , 1999, Smart Structures.

[14]  D Hemphill.  STRUCTURAL HEALTH MONITORING SYSTEM FOR THE EAST 12TH BRIDGE , 2004 .

[15]  A. Othonos.  Fiber Bragg gratings , 1999 .

[16]  Farhad Ansari,et al.  Practical Implementation of Optical Fiber Sensors in Civil Structural Health Monitoring , 2007 .

[17]  Christine Connolly.  Fibre‐optic‐based sensors bring new capabilities to structural monitoring , 2006 .

[18]  Aníbal Costa,et al.  Weldable fibre Bragg grating sensors for steel bridge monitoring , 2008 .

[19]  Yi-Qing Ni,et al.  Technology developments in structural health monitoring of large-scale bridges , 2005 .

[20]  Hyo-Gyoung Kwak,et al.  Implementation of bond-slip effect in analyses of RC frames under cyclic loads using layered section method , 2006 .

[21]  K. Hill,et al.  Fiber Bragg grating technology fundamentals and overview , 1997 .

[22]  Fabio Matta,et al.  Distributed Strain Measurement in Steel Bridge with Fiber Optic Sensors: Validation through Diagnostic Load Test , 2008 .

[23]  R. Measures.  Structural Monitoring with Fibre Optic Technology , 2001 .

[24]  Ashraf Ayoub,et al.  Evaluation of fiber optic sensors for remote health monitoring of bridge structures , 2009 .

[25]  Gangbing Song,et al.  Recent applications of fiber optic sensors to health monitoring in civil engineering , 2004 .

[26]  Joan R. Casas,et al.  Fiber Optic Sensors for Bridge Monitoring , 2003 .

[27]  James M. W. Brownjohn,et al.  Development of fiber Bragg grating sensors for monitoring civil infrastructure , 2005 .

[28]  Farhad Ansari,et al.  Implementation of Long Gauge Fiber Optic Sensor Arrays in Civil Structures , 2005 .

[29]  Gao Zhanfeng,et al.  Strain monitoring of railway bridges using optic fiber sensors , 2007 .

[30]  Sami H. Rizkalla,et al.  Intelligent Sensing for Innovative Bridges , 1999 .

[31]  Lu Deng,et al.  Applications of fiber optic sensors in civil engineering , 2007 .

[32]  Yong Wang,et al.  Simultaneous monitoring of the amplitude and location of loading with fiber Bragg grating sensor arrays , 2001, SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring.

[33]  Hy Tam,et al.  Utilization of fiber optic bragg grating sensing systems for health monitoring in railway applications , 2007 .

[34]  Zhishen Wu,et al.  Development of Distributed Long-gage Fiber Optic Sensing System for Structural Health Monitoring , 2007 .

[35]  Li Li,et al.  Study on the Spatial Division Multiplexing Technique of Fiber Bragg Grating Sensors , 2009, 2009 Symposium on Photonics and Optoelectronics.

[36]  Y. M. Gebremichael,et al.  Methodology and integrity monitoring of foundation concrete piles using Bragg grating optical fibre sensors , 2007 .