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Using Fiber Bragg Grating (FBG) sensors for vertical displacement measurement of bridges

Yau, M.H., Chan, T.H.T., Thambiratnam, D.P., & Tam, H.Y. (2011) Using Fiber Bragg Grating (FBG) sensors for vertical displacement measurement of bridges. In Proceedings of The 14th Asia Pacific Vibration Conference, The Hong Kong Polytechnic Univeristy, Hong Kong Polytechnic University, Hong Kong, pp. 288-297.

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Abstract

In many bridges, vertical displacements are one of the most relevant parameters for structural health monitoring in both the short and long terms. Bridge managers around the globe are always looking for a simple way to measure vertical displacements of bridges. However, it is difficult to carry out such measurements. On the other hand, in recent years, with the advancement of fiber-optic technologies, fiber Bragg grating (FBG) sensors are more commonly used in structural health monitoring due to their outstanding advantages including multiplexing capability, immunity of electromagnetic interference as well as high resolution and accuracy. For these reasons, using FBG sensors is proposed to develop a simple, inexpensive and practical method to measure vertical displacements of bridges. A curvature approach for vertical displacement measurement using curvature measurements is proposed. In addition, with the successful development of a FBG tilt sensors, an inclination approach is also proposed using inclination measurements. A series of simulation tests of a full-scale bridge was conducted. It shows that both the approaches can be implemented to determine vertical displacements for bridges with various support conditions, varying stiffness (EI) along the spans and without any prior known loading. These approaches can thus measure vertical displacements for most of slab-on-girder and box-girder bridges. Moreover, with the advantages of FBG sensors, they can be implemented to monitor bridge behavior remotely and in real time. Further recommendations of these approaches for developments will also be discussed at the end of the paper.

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ID Code: 46401
Item Type: Conference Paper
Keywords: Vertical displacement, structural health monitoring (SHM), bridge, Fiber Bragg Grating (FBG) sensors
ISBN: 9789623677318
Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > CIVIL ENGINEERING (090500) > Civil Engineering not elsewhere classified (090599)
Divisions: Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering
Past > Schools > School of Urban Development
Copyright Owner: Copyright 2011 The Authors
Deposited On: 12 Oct 2011 08:32
Last Modified: 17 Feb 2012 16:25

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