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Using Fiber Bragg Grating (FBG) sensors to measure vertical displacements of bridges : a preliminary study

Yau, Man Hong, Chan, Tommy H.T., Thambiratnam, David, & Tam, Hwa-Yaw (2011) Using Fiber Bragg Grating (FBG) sensors to measure vertical displacements of bridges : a preliminary study. In The First International Postgraduate Conference on Engineering, Designing and Developing the Built Environment for Sustainable Wellbeing, 27-29 April 2011, Queensland University of Technology, Brisbane, Qld.

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Abstract

In many bridges, vertical displacements are the most relevant parameter for monitoring in the both short and long term. However, it is difficult to measure vertical displacements of bridges and yet they are among the most important indicators of structural behaviour. Therefore, it prompts a need to develop a simple, inexpensive and yet more practical method to measure vertical displacements of bridges. With the development of fiber-optics technologies, fiber Bragg grating (FBG) sensors have been widely used in structural health monitoring. The advantages of these sensors over the conventional sensors include multiplexing capabilities, high sample rate, small size and electro magnetic interference (EMI) immunity. In this paper, methods of vertical displacement measurements of bridges are first reviewed. Then, FBG technology is briefly introduced including principle, sensing system, characteristics and different types of FBG sensors. Finally, the methodology of vertical displacement measurements using FBG sensors is presented and a trial test is described. It is concluded that using FBG sensors is feasible to measure vertical displacements of bridges. This method can be used to understand global behaviour of bridge‘s span and can further develop for structural health monitoring techniques such as damage detection.

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ID Code: 43408
Item Type: Conference Paper
Keywords: Vertical Displacement, Structural Health Monitoring (SHM), Bridge, Fiber Bragg Grating (FBG) sensors
ISBN: 9780980582741
Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > CIVIL ENGINEERING (090500) > Structural Engineering (090506)
Divisions: Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering
Past > Schools > School of Urban Development
Copyright Owner: Copyright 2011 The Authors & Queensland University of Technology
Copyright Statement: This publication contains conference proceedings. Reproduction, but not modification, is permissible without the authors‘ consent provided that the authors‘ work is referenced appropriately. No modification of the contents of this publication is allowed. The Organising Committee and Queensland University of Technology are not responsible for the statements or opinions expressed in this publication. Any statements or views expressed in the papers contained in these Proceedings are those of the author(s). Mention of trade names or commercial products does not constitute endorsement or recommendation for use.
Deposited On: 21 Jul 2011 08:50
Last Modified: 12 Aug 2011 07:58

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